Colorado
- Archaeology of Castle Rock Pueblo: The history and archaeology of Castle Rock
- Colorado Genealogical Society
- Colorado Genealogy Search Guide
- Colorado Historic Newspapers: Digitized articles from 1859 to 1923, by written permission up to 1963
- Colorado Society of Hispanic Genealogy
- Denver Public Library: Genealogy, African American and western history resources
- Denver Public Library: Genealogy and Obituaries
- Estes Valley Library: Genealogy and history in Estes Park
- Explore Old West Colorado: Includes information on several explorers, pioneers, outlaws and much more
- Genealogy Branches: Listing of online genealogy records and resources
- Genealogy.org - Colorado: Colorado family history databases
- Greeley Obituaries: Weld county, Longmont, Northglenn, Thornton, and Greeley Obituaries
- Stephen H Hart Library and Research Center: At the Colorado History Museum in Denver
- Weld County: History and stories
- Western States Marriage Form