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Records of the Jefferson County Assessor and/or Treasurer including historical abstracts of assessment; property assessment rolls and tax lists; and property tax appraisal photos.

Records of the Jefferson County Board of County Commissioners including historical meeting minutes and resolutions, and other records created by or about the Board.

Records of the Colorado State University Cooperative Extension program (CSU Extension) in Jefferson County including annual reports of agents; and photographs of 4-H events and other agricultural programs.

Plats, maps, and statements of claim to water rights for ditches, reservoirs and water supply sources recorded in Jefferson County.

Records useful for genealogical research including cemetery records and indexes to names found in other collections.

Articles of incorporation and financial reports of companies seeking to incorporate and conduct business within Jefferson County. Includes some municipal incorporations.

Materials that tell the story of Jefferson County’s people, places, and events (that are not created by Jefferson County government) including personal and family papers.

A collection of maps, plats, and drawings including subdivision and townsite plats; cemetery plats; railroad maps; school district maps; historical zoning maps; and more.

A variety of records created or received by other departments and offices within Jefferson County including the first building codes and zoning ordinances.

A collection of photographs documenting the people, places, and things that have helped make Jefferson County the special place it is today.

Collection of picture postcards containing images of tourist sites throughout Jefferson County and the surrounding area. Also includes a handful of real photo postcards of people from Jefferson County. 

A collection of scrapbooks compiled by various groups and people around Jefferson County including Home Demonstration Clubs and the Jefferson County Historical Commission.