Left Hand Canyon

Altona is an unincorporated community and a census-designated place (CDP) located in and governed by Boulder County, Colorado, United States. The CDP is a part of the Boulder, CO Metropolitan Statistical Area. The population of the Altona CDP was 512 at the United States Census 2020. The Boulder post office (Zip Code 80302) serves the area.

Lazy Acres is an unincorporated community and a census-designated place (CDP) located in and governed by Boulder County, Colorado, United States. The CDP is a part of the Boulder, CO Metropolitan Statistical Area. The population of the Lazy Acres CDP was 957 at the United States Census 2020. The Boulder post office (Zip Code 80302) serves the area.

This is a list of the National Register of Historic Places listings in Boulder County, Colorado. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Boulder County, Colorado, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in a map.There are 88 properties and districts listed on the National Register in the county, including 1 National Historic Landmark. Another two properties were once listed but have been removed.     This National Park Service list is complete through NPS recent listings posted January 19, 2024.

Boulder County is a county located in the U.S. state of Colorado of the United States. As of the 2020 census, the population was 330,758. The most populous municipality in the county and the county seat is Boulder.Boulder County comprises the Boulder, Colorado Metropolitan Statistical Area, which is included in the Denver–Aurora, Colorado Combined Statistical Area.

The Marshall Fire was a destructive wildfire and urban conflagration that started on December 30, 2021, shortly after 11:00 a.m. MST, as a grass fire in Boulder County, Colorado. The fire killed two people and became the most destructive fire in Colorado history in terms of buildings destroyed.

Jackson County was a county of the extralegal United States Territory of Jefferson that existed from November 28, 1859, until February 28, 1861.

KRKS-FM (94.7 MHz) is a commercial radio station licensed to Lafayette, Colorado, and serving the Denver-Boulder market and the Denver metropolitan area. The station is owned and operated by the Salem Media Group and it airs a Christian talk and teaching radio format. Its studios and offices are located on South Vaughn Way in Aurora, and the transmitter is located on Lee Hill, northwest of Boulder. KRKS-FM is co-owned AM 990 KRKS. Together, they are known as "The Word." While both KRKS stations broadcast a Christian Talk/Teaching format, they program each station differently.

Pine Brook Hill is an unincorporated community and a census-designated place (CDP) located in and governed by Boulder County, Colorado, United States. The CDP is a part of the Boulder, CO Metropolitan Statistical Area. The population of the Pine Brook Hill CDP was 983 at the United States Census 2010. The Boulder post office (Zip Code 80304) serves the area.

Glendale is an unincorporated community and a census-designated place (CDP) located in and governed by Boulder County, Colorado, United States. The CDP is a part of the Boulder, CO Metropolitan Statistical Area. The population of the Glendale CDP was 64 at the United States Census 2020. The Jamestown post office (Zip Code 80455) serves the area.

Boulder Geomagnetic Observatory (BOU) is a geomagnetic observation facility operated by the United States Geological Survey (USGS). It is located near Boulder, Colorado at 40°08′15″N 105°14′16″W. The site was established in 1961. Customers of the observatory include the Space Weather Prediction Center (SWPC) and the Air Force Weather Agency (AFWA).

Seven Hills is an unincorporated community and a census-designated place (CDP) located in and governed by Boulder County, Colorado, United States. The CDP is a part of the Boulder, CO Metropolitan Statistical Area. The population of the Seven Hills CDP was 121 at the United States Census 2010. The Boulder post office (Zip Code 80302) serves the area.

Sunshine (also known as Sunshine Canyon) is an unincorporated community and a census-designated place (CDP) located in and governed by Boulder County, Colorado, United States. The CDP is a part of the Boulder, CO Metropolitan Statistical Area. The population of the Sunshine CDP was 198 at the United States Census 2020. The Boulder post office (Zip Code 80302) serves the area.