Public records genealogy is the practice of using government and historical records — birth certificates, census records, property deeds, court filings, military service files, and immigration documents — to trace family history and reconstruct ancestral relationships across generations.
Quick Answer: Public records are the foundation of genealogy research because they document key life events and family relationships with primary-source evidence. The most important record types are vital records, census records, probate files, property deeds, military service records, and immigration documents. Many are available free through FamilySearch, the National Archives, and state vital records offices. The key principle is working backward from the present — verifying each generation before moving further into the past.
Genealogy research depends on documented evidence. While family stories and oral traditions provide clues, public records provide the verification needed to confirm names, relationships, locations, and timelines. A birth certificate places a person in a specific time and place with specific parents. A census record names every household member. A probate file lists heirs. These records were created when events occurred — making them primary historical documentation, not secondary summaries.
⚠️ Legal Notice: Access rules for public records vary by record type, jurisdiction, and the age of the records. Many recent vital records are restricted to protect living individuals. Some records require formal request processes. This guide explains lawful research methods only and does not constitute legal advice.
Why This Guide Is Reliable
inet-investigation.com publishes research-based guides built on primary government sources, investigative practice, and public records law. All sources cited link to official government websites or primary legal references. For jurisdiction-specific legal questions, consult a licensed attorney or the relevant government agency.
Why Public Records Outperform Online Family Trees
Many genealogy websites allow users to publish family trees. While these trees provide useful leads, they are user-submitted and frequently contain errors — wrong birth dates, misidentified parents, merged records from different people with the same name. A published family tree is a hypothesis, not evidence.
Public records provide stronger evidence because they were created at the time events occurred by official agencies or institutions with legal responsibility for accurate documentation. A birth certificate filed in 1923 is a primary source. A family tree entry copied from another user’s unverified tree is not.
Experienced genealogists treat online family trees as starting points — clues that direct research toward primary sources. The goal is always to find the original government record that documents each fact.
→ Related guide: What Are Public Records?
The Foundational Rule: Start With Yourself and Work Backward
The most important principle in genealogy research is to start with what you know with certainty — yourself — and work backward in time one generation at a time. Confirm your own birth information, then your parents’ records, then your grandparents’ vital records, then census records identifying earlier generations.
Working backward prevents a common mistake: attaching yourself to the wrong family line because you jumped to a historical record without verifying the connecting generations. Every step backward should be verified with primary sources before proceeding to the next generation.
Key Record Types for Genealogy Research
Vital Records: The Foundation of Every Family Tree
Vital records — birth certificates, marriage licenses, divorce decrees, and death certificates — document the major life events that define family relationships. They are the first records to locate for each individual in a family line.
Birth certificates typically include the child’s name and birth date, parents’ names (including mother’s maiden name), parents’ birthplaces, and sometimes parents’ ages and occupations. The parents’ birthplaces and ages are often the key data points that lead to the next generation of research.
Marriage records confirm family relationships and often include both parties’ parents’ names, birthplaces, and ages — another generation revealed in a single document. Some marriage records include previous marriage history.
Death certificates may list the deceased’s parents (including mother’s maiden name), birthplace, spouse, and informant. The informant’s identity — often a child or sibling — is itself a lead for further research.
Where vital records are held: State vital records offices maintain records from roughly the late 1800s forward (dates vary by state). Earlier vital records may be at the county level or in church records. Most states have online ordering portals for certified copies.
How to find state vital records offices: Search “[state name] vital records” — each state health department maintains its own portal with access instructions, fees, and eligibility requirements.
Access restrictions: Recent birth records are typically restricted to the subject or immediate family. Death, marriage, and divorce records are generally public in most states after varying waiting periods. Some states make older historical records freely searchable online.
→ Related guide: What Are Public Records?
Census Records: Snapshots of Every Household
U.S. census records are among the most valuable genealogy resources because they document every household in the country at ten-year intervals — providing a snapshot of family composition, ages, birthplaces, and relationships across multiple generations.
What census records contain:
- Every household member’s name (in most census years)
- Age and birth year
- Birthplace and parents’ birthplaces
- Occupation
- Relationship to head of household
- Address or location
The 72-year rule: U.S. census records become publicly available 72 years after the census date. The 1950 census was released in April 2022. The 1960 census will be released in 2032. For most genealogy research, records through 1950 are currently accessible.
Where to access census records:
- FamilySearch (familysearch.org) — free access to digitized census records
- National Archives (archives.gov) — official custodian of U.S. census records
- Ancestry.com — largest commercial census database with enhanced search tools
Research strategy: Work backward through census years. Find the subject in the 1950 census, then the 1940, then the 1930, and so on. Each census captures the family at a different stage of life and may reveal parents, siblings, or other relatives not documented in vital records.
Court Records: Probate, Divorce, and Guardianship
Court records are among the most underused genealogy resources — yet they frequently contain family relationship information found nowhere else.
Probate records are particularly valuable. When someone died, their estate went through probate court — producing a case file that typically lists all legal heirs, their relationships to the deceased, their addresses, and sometimes their ages. A probate file can name every child, grandchild, and sibling of a deceased ancestor in a single document.
Divorce records document marriage dissolution and often include the names of children, custody arrangements, and biographical details about both parties.
Guardianship filings document who was appointed guardian of minor children after a parent’s death — identifying family members and their relationships.
Where to find probate and court records:
- County courts — probate is handled at the county level in most states. Search “[county name] [state] probate court records” for the relevant portal.
- State court portals — some states include probate records in their statewide court search systems.
- PACER (pacer.gov) — federal court records, occasionally useful for bankruptcy filings that reveal family financial history.
- FamilySearch — has digitized many historical probate records from county courthouses.
→ Related guide: How Court Records Work in the United States
Property Records: Tracing Land Ownership and Family Migration
Property records document where families lived, how land passed between generations, and the geographic movements of families over time. They are maintained by county recorder or register of deeds offices.
What property records reveal for genealogy:
- Where an ancestor lived and when
- Land inherited from parents — deed transfers that reference family relationships
- Migration patterns — selling land in one county and buying in another
- Financial circumstances — mortgage and lien history
How to search property records for genealogy:
- Identify the county where the ancestor lived
- Search the county recorder or register of deeds portal by the ancestor’s name
- Look for deed transfers that reference family relationships — grantors and grantees with the same surname
- Search backward through deed indexes to find original land patents or grants
BLM General Land Office Records (glorecords.blm.gov) — the Bureau of Land Management maintains free records of original federal land patents — the first transfer of federal land to private ownership. These documents often identify the earliest land ownership for families who settled in territories that were formerly federal land.
→ Related guide: How Property Records Work in the United States
Military Records: Service, Pensions, and Draft Registrations
Military records are among the richest genealogy sources because pension applications in particular required detailed biographical documentation — including birth records, marriage certificates, and affidavits from relatives.
Types of military records:
- Service records — enlistment documents, muster rolls, discharge papers
- Pension applications — contain extensive biographical detail including birth date and place, marriage documentation, children’s names and ages, and widow’s testimony after the veteran’s death
- Draft registrations — World War I and World War II draft cards documented millions of men and include physical description, occupation, and nearest relative
- Burial and memorial records — Veterans Administration burial records document deceased veterans
Where military records are held:
- National Archives and Records Administration (archives.gov/veterans) — official custodian of most federal military records
- National Personnel Records Center (nprc.nara.gov) — requests for 20th-century military service records
- FamilySearch — digitized military records including pension files and draft registrations
- Fold3 (fold3.com) — specialized military records database
Requesting recent military records: Records for service members discharged within the past 62 years may require a formal records request through the National Personnel Records Center using Standard Form 180 (SF-180), available at archives.gov/veterans/military-service-records.
→ Related guide: How FOIA Requests Work
Immigration and Naturalization Records
For families with immigrant ancestors, immigration and naturalization records document the most significant transition in family history — the decision to leave one country and settle in another.
Passenger lists and ship manifests document when an ancestor arrived, the ship and port of entry, their origin, their destination, and often relatives already in the country. Post-1906 manifests are particularly detailed, including physical description, last residence, and U.S. contact.
Naturalization records document the process of becoming a U.S. citizen, often including birth date and place, arrival date, and declaration of intent. Pre-1906 naturalizations could occur in any court — federal, state, or local — requiring searches in multiple jurisdictions.
Where immigration records are held:
- Ancestry.com — largest database of digitized passenger lists
- FamilySearch — free access to many immigration records
- Ellis Island Database (libertyellisfoundation.org) — free search of Ellis Island arrivals 1892–1957
- National Archives (archives.gov) — official custodian of naturalization records
- Castle Garden (castlegarden.org) — pre-Ellis Island arrivals 1820–1892
USCIS Genealogy Program vs. general FOIA: For historical immigration files, the USCIS Genealogy Program (uscis.gov/genealogy) is usually the better route than a standard FOIA request. The Genealogy Program is specifically designed for historical records research — it processes requests for A-Files (alien registration files), visa petitions, and naturalization certificates for individuals who died more than 50 years ago. Standard FOIA requests to USCIS are processed by a different office and often take longer for historical genealogy purposes. Use the Genealogy Program first; reserve FOIA for situations where the Genealogy Program doesn’t cover the records you need.
→ Related guide: How FOIA Requests Work
Obituaries and Cemetery Records
Obituaries are valuable genealogy sources because they were often written by family members and may document relationships, survivors’ names, and biographical details not found in official records.
- FindAGrave (findagrave.com) — free database of cemetery records, grave photos, and memorial pages
- BillionGraves (billiongraves.com) — GPS-indexed headstone photographs from cemeteries worldwide
- Library of Congress Chronicling America (chroniclingamerica.loc.gov) — free access to historical newspapers 1770–1963
County and Local Archives: Where Early Research Lives
For genealogy research before the late 19th century — before statewide vital records systems existed and before national databases were compiled — county and local archives are often the only place where records survive.
Before centralized record-keeping, county courthouses maintained the official records of everyday life: property deeds, probate files, marriage bonds, tax lists, voter registrations, and court proceedings. Many of these records were never digitized and never indexed in national databases. They exist only in physical form at the county courthouse, a county historical society, or a state archive.
What county archives typically hold:
- Deed books and land records going back to the county’s founding
- Probate records and estate inventories
- Early marriage registers and bonds
- Tax lists and personal property assessments
- County court minutes and order books
- Birth and death registers predating state vital records
How to find and access county archives: Search “[county name] [state] county clerk archives” or “[county name] historical society.” Many county clerks maintain historical records separate from current court operations. State archives often hold older county records that have been transferred for preservation.
For counties with no online access: Contact the county clerk’s office or historical society directly by phone or mail. Many genealogy researchers obtain records by mail by sending a letter with the ancestor’s name, approximate dates, and a check for the applicable fee. Some counties have volunteer genealogy societies that will perform lookups for a small donation.
State archives: Every state maintains a state archive holding records transferred from county and state agencies. These often include early census substitutes, colonial-era records, and records from counties that no longer exist or whose boundaries changed. Search “[state name] state archives genealogy” for the relevant portal.
Regional FamilySearch centers: FamilySearch operates a network of local Family History Centers — often located in LDS meetinghouses — that provide free access to microfilm, databases, and research assistance. Many hold records for local counties that aren’t available online anywhere else.
Keeping a Research Log and Citing Sources
One of the most important differences between casual tree-building and reliable genealogy research is documentation. A research log and proper source citations transform a collection of guesses into a verifiable historical record.
Why it matters: Without documentation, you can’t evaluate how strong your evidence is, you can’t share your research so others can verify it, and you’ll repeat searches you’ve already done when you return to a line months or years later. Undocumented family trees have no research value — they’re just assertions.
What a research log tracks:
- Every source searched, even when the search produced no results
- The date of each search
- The exact search terms used
- What was found — or confirmed not to exist
Negative results — searches that returned nothing — are as valuable as positive results. A log entry showing you searched the 1880 census for [county] under variations of a surname and found nothing tells you the family wasn’t enumerated there, prompting the next question about where they were.
Source citations for genealogy: Each fact in a family tree should reference the specific source that documents it. A minimal citation includes the record name, the repository or database where it was found, the date accessed, and any identifying information (page number, file number, record ID).
Example: 1940 U.S. Census, Cook County, Illinois, population schedule, Chicago Ward 42, sheet 14A, household of [name]; digital image, Ancestry.com (accessed [date]), citing National Archives microfilm T627.
Tools for research management:
- Genealogy software (RootsMagic, MacFamilyTree, Gramps) — manages sources, citations, and research notes alongside the family tree
- Research logs — a simple spreadsheet tracking every source searched works as well as dedicated software
The research log and source citation habit separates genealogy that can be verified and shared from genealogy that has to be redone from scratch every time someone questions a conclusion.
Free Genealogy Resources
| Resource | What It Covers | URL |
|---|---|---|
| FamilySearch | Census, vital, military, immigration records worldwide | familysearch.org |
| National Archives | Census, military, immigration, naturalization | archives.gov |
| Ellis Island Database | Ellis Island arrivals 1892–1957 | libertyellisfoundation.org |
| BLM Land Records | Original federal land patents | glorecords.blm.gov |
| FindAGrave | Cemetery records and memorials | findagrave.com |
| Library of Congress — Chronicling America | Historical newspapers 1770–1963 | chroniclingamerica.loc.gov |
| PACER | Federal court records | pacer.gov |
| Castle Garden | Pre-Ellis Island arrivals 1820–1892 | castlegarden.org |
| USCIS Genealogy Program | Historical immigration files | uscis.gov/genealogy |
Paid Genealogy Tools
Subscription pricing for genealogy services changes frequently — verify current pricing on each service’s website before subscribing. Most offer free trial periods worth using before committing.
| Service | Best For | Strengths |
|---|---|---|
| Ancestry.com | U.S. and international research | Largest database, best census coverage, DNA testing |
| MyHeritage | International research, DNA | Strong European records, DNA matching |
| FindMyPast | British and Irish ancestry | Best for UK and Ireland records |
| Fold3 | Military records | Specialized military service and pension records |
| Newspapers.com | Obituaries and historical news | Large historical newspaper archive |
| GenealogyBank | Obituaries and historical records | Strong obituary database |
FamilySearch is entirely free and covers a substantial portion of what paid services offer — worth exhausting before subscribing to commercial tools.
How to Build a Research Timeline
A research timeline organizes what you know and what you still need to find. For each individual, create a timeline of known life events:
- Birth year and location
- Parents’ names (if known)
- Siblings (if known)
- Marriage year and location
- Children’s names and birth years
- Residences by census year
- Death year and location
Gaps in the timeline become research targets. A person who appears in the 1920 census but not the 1930 census either moved, died, or was missed. Each gap suggests a specific record to search.
Breaking Through Genealogy Brick Walls
Search siblings and relatives. If your ancestor’s records are sparse, research their siblings. Siblings’ records often contain information about parents and family origins that doesn’t appear in your direct ancestor’s records.
Cluster research. Examine neighbors in census records, witnesses on marriage and death certificates, and fellow church members. Families frequently migrated together — neighbors with the same surname or from the same origin often turn out to be relatives.
Search different record types. If vital records are missing, try probate, property, or church records. Each record type was created by a different agency for a different purpose — gaps in one type are often filled by another.
Look for naturalization records. Naturalization files — particularly pre-1906 records in local courts — often contain birthplace information that leads back to the country of origin.
Consider name variations. Ancestors’ names were often recorded phonetically, translated, or anglicized. Search multiple spelling variations of the surname, not just the standard form.
Check newspapers for obituaries. Even brief obituaries often name surviving children, siblings, and other relatives that don’t appear in any official record.
Privacy Considerations: Living Persons vs. Deceased Records
Most genealogy records — census records, older vital records, probate files, property records — cover people who have been dead for decades and are freely accessible. For living individuals or recent records, significant restrictions apply.
Recent birth records — typically restricted to the subject or immediate family in most states.
The general rule: Records more than 72–100 years old are broadly accessible. Records involving living individuals or created within recent decades are subject to access restrictions that vary by state and record type.
Common Mistakes That Derail Genealogy Research
Relying on family stories without verification. Oral family histories are valuable starting points — not evidence. Every family claim should be verified against primary records before being incorporated into a family tree.
Trusting user-submitted family trees. Online family trees on Ancestry, FamilySearch, and similar platforms are user-contributed and frequently contain errors. Always trace claims back to primary source documents.
Searching only one database. No single genealogy database contains all records. FamilySearch has records that Ancestry doesn’t. State archives have records that neither covers. County courthouse records may never have been digitized.
Ignoring county-level records. Many of the most valuable genealogy records — probate files, early deed records, marriage registers — exist only at the county level and have never been indexed in national databases.
Not documenting sources. Every fact should be documented with the specific source: the record name, repository, date accessed, and page or file number. Undocumented family trees have no research value.
Frequently Asked Questions
What are the best free resources for genealogy research? FamilySearch (familysearch.org) is the most comprehensive free genealogy database — covering billions of records including U.S. census, vital records, military records, and international collections. The National Archives (archives.gov) is the official source for U.S. census, military, and immigration records.
How far back can I trace my family with public records? In the United States, government vital records typically begin in the late 1800s. Census records go back to 1790. Property and probate records in some counties go back to the colonial period. Church records in some regions extend even further.
Can I access probate records online? Many county probate records have been digitized and are accessible through FamilySearch, Ancestry, or county clerk portals. Others exist only in physical archives at the county courthouse. Availability depends entirely on whether that specific county has digitized its historical records.
What’s the difference between the USCIS Genealogy Program and a FOIA request? The USCIS Genealogy Program is specifically designed for historical immigration research — it processes requests for individuals who died more than 50 years ago and is generally faster and better suited to genealogy purposes than a standard FOIA request. Use the Genealogy Program first for historical immigration files; standard FOIA is better suited for more recent records or records from other federal agencies.
What’s the difference between FamilySearch and Ancestry? FamilySearch is entirely free and maintained by The Church of Jesus Christ of Latter-day Saints as a nonprofit genealogy resource. Ancestry.com is a commercial subscription service with a larger database, better search tools, and DNA testing capabilities. Most researchers use both — starting with FamilySearch’s free records and supplementing with Ancestry for records not available free.
Final Thoughts
Public records are the foundation of reliable genealogy research. Birth certificates, census records, property deeds, probate files, immigration documents, and military records collectively document the lives of past generations with primary-source evidence that online family trees can’t provide.
The approach is the same as in any public records investigation: identify which agency created the record, determine which repository holds it, and search that source directly. For genealogy, that means working backward one generation at a time — verifying each link in the chain before extending it further — and keeping a research log that documents every source searched so findings can be verified, shared, and built upon.
For the generations before national databases existed, the trail leads to county courthouses, state archives, and local historical societies — repositories where the records of everyday life were kept long before anyone thought to digitize them. That’s where the most important discoveries often wait.
Related Guides
- What Are Public Records?
- How Property Records Work in the United States
- How Court Records Work in the United States
- How FOIA Requests Work
- What Is PACER? A Beginner’s Guide to Federal Court Records
- Best Government Databases for Background Research
Disclaimer: This article is for informational purposes only and does not constitute legal advice. Public records access rules vary by jurisdiction and record type. Consult official government agencies or a licensed attorney for guidance on specific records requests. This article may contain affiliate links — we may earn a commission if you purchase through them, at no extra cost to you.