County Past
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Boulder County, Colorado

Historic newspapers, landmarks, and county history layers for genealogists and local historians.

—newspaper titles
—digitized titles
95historic places
—earliest paper
1861formed
330,758pop. 2020
21cemeteries
—CW battlefields

At a glance

Summary

The National Register of Historic Places includes 95 listed properties in the county, first listed in 1974; 3 are also National Historic Landmarks. Most listings are in or near Boulder, Longmont, Louisville.

Summary generated automatically from the source data on this page.

Newspapers

Library of Congress

Newspaper directory data for Colorado is not yet loaded on this site. Browse Boulder titles at the Library of Congress.

National Register of Historic Places

NPS NRHP

61 of 95 listings mapped; some locations are restricted by NPS to protect sensitive sites.

95 listed properties
PropertyCityTypeListed
Arnett-Fullen HouseBoulderBuilding2009
Barker, Hannah, HouseBoulderBuilding2019
Boulder County Courthouse NHLBoulderBuilding
Boulder County Courthouse NHLBoulderBuilding
Boulder County Poor FarmBoulderDistrict2001
Boulder Creek BridgeBoulderStructure2003
Boulder Valley Grange No. 131LafayetteBuilding1987
Buchan CabinEldoraBuilding2020
Bunce SchoolAllensparkBuilding1986
Callahan, T. M., HouseLongmontBuilding1985
Cardinal MillNederlandBuilding2011
Carnegie LibraryBoulderBuilding1979
Chautauqua AuditoriumBoulderBuilding1974
Church of the BrethrenHygieneBuilding1984
Colorado Chautauqua NHLBoulderDistrict1978
Columbia CemeteryBoulderDistrict1997
Congregational ChurchLafayetteBuilding1983
Denver Elevator-Grain ElevatorLouisvilleBuilding1986
Denver, Boulder and Western Railway Historic DistrictWardDistrict1980
Denver, Northwestern and Pacific Railway Historic DistrictEldoraDistrict1980
Denver, Northwestern and Pacific Railway Historic District-Rollinsville & Middle Park Wagon Road (Boundary Increase)RollinsvilleDistrict1997
Dickens Opera HouseLongmontBuilding1987
Downtown Boulder Historic DistrictBoulderDistrict1980
Downtown Longmont Historic DistrictLongmontDistrict2017
East Side Historic DistrictLongmontDistrict1986
Eldora Historic DistrictEldoraDistrict1989
Empson CanneryLongmontBuilding1984
First Baptist Church of BoulderBoulderBuilding2004
First Congregational Church of LyonsLyonsBuilding1976
Fox Mine OfficeBoulderBuilding1996
Fox Stone BarnBoulderBuilding1996
Ginacci HouseLouisvilleBuilding1986
Gold Hill Historic DistrictGold HillDistrict1989
Gold Miner HotelEldoraBuilding1997
Gold Miner Hotel (Boundary Increase)EldoraBuilding2007
Highland SchoolBoulderBuilding1978
Holmes, David Hull, HouseBoulderBuilding2018
Hotel BoulderadoBoulderBuilding1994
Hoverhome and Hover FarmsteadLongmontDistrict1999
Jacoe StoreLouisvilleBuilding1986
Jamestown Mercantile BuildingJamestownBuilding1989
Jamestown Town HallJamestownBuilding2003
Jamestown Town Hall (Boundary Increase)JamestownBuilding2007
Kullgren HouseLafayetteBuilding1983
LaSalla HouseLouisvilleBuilding1986
Lackner's TavernLouisvilleBuilding1986
Lafayette HouseLafayetteBuilding1983
Lewis HouseLafayetteBuilding1983
Little Church in the PinesSalinaBuilding1989
Longhurst LodgeAllensparkDistrict2017
Longmont Carnegie LibraryLongmontBuilding1992
Longmont CollegeLongmontBuilding1987
Longmont Fire DepartmentLongmontBuilding1985
Longmont Power PlantLyonsBuilding1987
Lyons Railroad DepotLyonsBuilding1974
Lyons Sandstone BuildingsLyonsDistrict1980
McKenzie WellBoulderSite2005
Miller HouseLafayetteBuilding1983
Modoc MillWardBuilding1978
Mount St. Gertrude AcademyBoulderDistrict1994
National Fuel Company StoreLouisvilleBuilding1986
Norlin Quadrangle Historic DistrictBoulderDistrict1980
North St. Vrain Creek BridgeLyonsStructure2002
Northern Colorado Power Company SubstationBoulderBuilding1986
Petrelli-DelPizzo HouseLouisvilleBuilding1986
Rhoades HouseLouisvilleBuilding1986
Robinson HouseLouisvilleBuilding1986
Rock Creek Farm Rural Historic DistrictBroomfieldDistrict2023
Rocky Mountain Mammoth MineNederlandBuilding2010
Salina SchoolSalinaBuilding1989
Sandbeach Lake TrailMeeker ParkStructure2008
Shannon FarmLafayetteDistrict2003
Squires-Tourtellot HouseBoulderBuilding1978
St. Stephen's Episcopal Church, 1881LongmontBuilding1975
Stolmes HouseLouisvilleBuilding1986
Sunshine SchoolSunshineBuilding1989
Swedish Evangelical Lutheran Church of RyssbyBoulderBuilding1984
Tego Brothers Drugstore-State National Bank of LouisvilleLouisvilleBuilding1986
Terrace, TheLafayetteBuilding1987
Thomas HouseLouisvilleBuilding1986
Thunder Lake Patrol CabinEstes ParkBuilding1988
Thunder Lake Trail-Bluebird Lake TrailAllens ParkStructure2008
Tower of CompassionLongmontBuilding2025
US Post Office-Boulder MainBoulderBuilding1986
Walker Ranch Historic DistrictBoulderDistrict1984
Walker Ranch Historic District (Boundary Increase)BoulderDistrict1988
Wall Street Assay OfficeWallstreetBuilding1989
Wall Street Assay Office (Boundary Increase)Wall StreetBuilding1992
Ward Congregational ChurchWardBuilding1989
Ward SchoolWardBuilding1989
Weiser, Martha, HouseBoulderBuilding2013
West Side Historic DistrictLongmontDistrict1987
Wild Basin HouseEstes ParkBuilding1988
Wild Basin Ranger Station and HouseEstes ParkBuilding1988
Woodward-Baird HouseBoulderBuilding1979

Source: National Park Service, National Register of Historic Places. Property links open NRHP nomination files at the National Archives.

County formation

Newberry AHCB

Boulder was formed in 1861 (1861-11-01) from unknown / original county.

BOULDER created by Colorado Territory from non-county area.

Source: Newberry Library, Atlas of Historical County Boundaries.

Population by decade

Census

Boulder County population from 1870 to 2020 (Census historical series).

331k166k1,9391870188019201950196020002020
1870188019001920194019501960198020002020
1,9399,72321,54431,86137,43848,29674,254189,625291,288330,758

Sources: U.S. Census Bureau historical county population (Forstall 1790–1990) and public-domain / CC0 county population series through 2020.

National Park Service sites nearby

NPS

Park units within about 40 km of the county centroid (from NPS Public POIs; no API key).

Source: NPS National Datasets / Public POIs. The NPS Developer API requires a free key and was not used.

Cemeteries & historical places

USGS GNIS

21 cemeteries and 5 historical populated places (ghost towns / former settlements) recorded in USGS GNIS for this county.

Cemeteries — 21 of 21 listed
NameLatLon
Burlington Cemetery40.14178-105.12078
Columbia Cemetery40.00835-105.28304
Eldorado Springs Cemetery39.93363-105.27094
Foothills Gardens of Memory40.23335-105.1029
Gold Hill Cemetery40.05699-105.40988
Gold Hill Cemetery Annex40.05669-105.40935
Green Mountain Cemetery39.99416-105.26808
Hygiene North Cemetery40.18942-105.16886
Hygiene South Cemetery40.18831-105.16886
Louisville Cemetery39.97304-105.10971
Mountain View Cemetery40.17992-105.10464
Mountain View Cemetery40.03915-105.25082
Nederland Cemetery39.96722-105.50722
Niwot Cemetery40.11297-105.18523
Ryssby Church Cemetery40.1397-105.20553
Sacred Heart of Mary Cemetery39.98917-105.19583
Salina Cemetery40.05694-105.38
Sunshine Cemetery40.06026-105.36544
Superior Cemetery39.95137-105.15637
Valmont Cemetery40.02978-105.20799
Weisner Cemetery40.20623-105.24685
Historical populated places — 5 of 5
NameLatLon
Cardinal39.96971-105.54778
Caribou39.98082-105.57861
Grand Island39.97082-105.60333
Hessie39.95499-105.6
Tungsten39.97193-105.47611

Source: USGS Geographic Names Information System (public domain). Cemeteries from the 2021 NationalFile archive; historical places from GNIS HistoricalFeatures topical extract.

Historical markers

HMdb link

Marker text and photos from the Historical Marker Database (HMdb) are not embedded here. HMdb allows non-commercial reuse with attribution, but commercial/compensated use needs written permission; this is a commercial site, so we only link out.

Search HMdb for Boulder County, Colorado

Terms: hmdb.org/copyright.asp. Linking is encouraged by HMdb.