Family Tree Denver refers to the process of researching your ancestors in the Denver, Colorado area, using local records, libraries, and archives. The Denver Public Library’s Western History and Genealogy Department and the Colorado State Archives are the two most important starting points for anyone tracing family roots in the Mile High City.
Why Denver Has a Unique Genealogical Landscape
Denver’s history as a frontier boomtown, mining hub, and railroad crossroads means its records are both rich and scattered. The city was founded in 1858 during the Pike’s Peak Gold Rush, so early settlers often left paper trails in mining claims, land offices, and county courts. Because Denver became the state capital in 1867, many state-level records—including vital statistics, military pensions, and land grants—are housed here, making it a regional research hub for Colorado and the broader Rocky Mountain West.
However, Denver County is a consolidated city and county, which simplifies some searches (there’s no separate county courthouse) but also means that older records may be split between city, county, and state repositories. Additionally, the city’s rapid growth in the late 19th century attracted migrants from across the U.S. and the world, so you may need to look beyond Colorado to trace ancestors who passed through Denver on their way west.
The Two Main Repositories: DPL and State Archives
If you’re starting in Denver, begin with the Denver Public Library’s Western History and Genealogy Department (often called WHG). It holds one of the largest genealogy collections in the region, including:
- Denver city directories (from 1859 onward) that list residents’ names, addresses, and occupations
- Historic newspapers on microfilm, including the Rocky Mountain News (1859–2009)
- Census records for Colorado and neighboring states
- Local family histories and manuscript collections
- Photographs, maps, and Sanborn fire insurance maps
The Colorado State Archives (located in Denver) holds official state records, including:
- Birth and death certificates (some as early as the 1870s, though statewide registration began in 1907)
- Marriage records (Denver County marriages from 1905 onward)
- Naturalization records for Colorado courts
- Military discharge records and pension applications
- Territorial and state land records
Both institutions offer free access to their collections, and DPL’s genealogy databases are accessible from home with a library card.
How to Start Your Denver Family Tree Research
Begin with what you already know—names, dates, and places of your immediate family—and work backward. Then use these steps to expand your research:
- Talk to relatives and gather family documents like birth certificates, marriage licenses, and obituaries.
- Search the U.S. Census for Denver households. The 1880, 1900, 1910, 1920, 1930, and 1940 censuses are fully indexed and available online for free at FamilySearch.org.
- Check Denver city directories to track an ancestor’s address and occupation year by year. DPL has an extensive collection on microfilm and in print.
- Look for vital records at the Colorado State Archives. For births and deaths before 1907, check county records or church registers.
- Search newspapers for mentions of your ancestor—birth announcements, marriage notices, legal notices, and obituaries. DPL’s digitized newspaper collection is searchable online.
- Use FamilySearch and Ancestry for digitized records, but verify everything against original documents.
Common Challenges in Denver Genealogy
Denver’s records have several quirks that can trip up beginners. First, the city’s early years were chaotic—many records from the 1860s and 1870s were lost in fires or poorly kept. Second, Denver County’s vital records only begin consistently in the early 20th century; earlier events may be recorded in church registers, court records, or even newspapers. Third, because Denver was a transportation hub, many people passed through without staying long, so you may find an ancestor in a directory one year and gone the next—they may have moved on to mining camps or other cities.
Another issue is name changes. Immigrants often anglicized their names upon arrival, and spelling was not standardized. Try searching with wildcards (e.g., “Schmidt” or “Smith”) and consider ethnic neighborhoods—Denver had distinct German, Irish, Italian, Chinese, and Mexican communities, and their records may be in churches or cultural organizations.
Comparing Online Databases vs. On-Site Research
For Denver ancestors, you’ll often need to combine online and on-site research. Online databases like FamilySearch, Ancestry, and MyHeritage have indexed many Denver records, including census, vital, and some court records. However, many local records—especially those not digitized—are only available at DPL or the State Archives. For example, DPL’s unique manuscript collections, such as the Rocky Mountain Jewish Historical Society records or the Colorado Society of Genealogists files, are not online.
If you can’t visit in person, DPL offers a remote research service where librarians answer specific questions and look up records for a fee. The State Archives also has a research request form. But for deep dives, nothing beats browsing the stacks and microfilm in person—you may stumble on documents you didn’t know existed.
Costs and Time Involved
Researching your Denver family tree can be done for free if you use the library and archives directly. Online subscription sites like Ancestry.com charge monthly fees (around $20–$40), but many libraries offer free access to Ancestry Library Edition on-site. DPL also provides free access to Fold3 (military records) and other databases with a library card. If you hire a professional genealogist, expect to pay $50–$100 per hour; the Association of Professional Genealogists has a directory of researchers who specialize in Colorado.
Time-wise, a simple search for a single ancestor may take a few hours, but a full family tree can take months or years if records are sparse. Start with one line and be patient—genealogy is a marathon, not a sprint.
Safety and Privacy Considerations
When sharing your family tree online, be mindful of living relatives’ privacy. Most genealogy websites let you mark living individuals as private, so their information is not publicly visible. Also, be cautious about DNA testing: while services like AncestryDNA and 23andMe can reveal ethnic origins and connect you with relatives, they also expose your genetic data to third parties. Read the privacy policies carefully and consider using a pseudonym or a separate email for genealogy accounts.
Additionally, be aware that some records—like adoption files or certain court documents—are sealed and cannot be accessed without a court order. Respect these legal restrictions and don’t attempt to obtain records through unethical means.
Alternatives to Traditional Research
If you’re hitting a brick wall with paper records, consider DNA testing. Many Denver residents have used DNA tests to break through genealogical dead ends, especially for immigrant ancestors or those who changed their names. DNA matches can point you to distant cousins who may have family records you lack. Another alternative is joining a local genealogy society, like the Colorado Genealogical Society or the Denver Public Library’s Genealogy Circle, which offer workshops, mentors, and access to exclusive databases.
You can also explore ethnic-specific resources: the Blair-Caldwell African American Research Library (a branch of DPL) has materials on Black history in Denver; the Auraria Library has collections on Hispanic and Chicano heritage; and the Rocky Mountain Jewish Historical Society maintains records of Jewish families in the region.
Frequently Asked Questions
Are Denver birth records available online for free? Some are. The Colorado State Archives has an index of births from 1876 to 1906, and FamilySearch has digitized many county birth records. For births after 1907, you can order certified copies from the Colorado Department of Public Health and Environment, but they are not free and have restrictions.
How do I find an ancestor’s address in Denver in 1920? Use the 1920 U.S. Census (available free on FamilySearch) and then cross-reference with the 1920 Denver city directory, which lists residents by name and address. DPL has these directories on microfilm and some are searchable online.
What if my ancestor was a miner—where are mining records? Mining claims were filed at the county courthouse where the mine was located, not in Denver. However, the Colorado State Archives has many mining company records, and the Denver Public Library’s Western History Department has maps and claim books for major mining districts.
Can I hire someone to do my Denver family tree for me? Yes, professional genealogists specialize in Colorado research. You can find vetted researchers through the Association of Professional Genealogists or the Colorado Genealogical Society’s referral list. Expect to pay for their time and any copies they make.
Is there a DNA project for Denver families? There isn’t a single Denver-specific DNA project, but many surname and regional projects exist on FamilyTreeDNA. You can also join the Colorado DNA Project, which focuses on families with Colorado roots.
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