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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.

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.

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.

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.

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.

Salina is a former mining town in Boulder County, Colorado, United States, approximately 7 miles (11 km) west of Boulder. Established in 1874, after Colorado's first gold discovery in 1859, Salina was founded by miners who migrated to Boulder from Salina, Kansas. It is located at the junction of Four Mile Canyon and Gold Run roads. The mining camp was originally accessible only by horseback or wagons pulled by mules but later became part of Colorado's Switzerland Trail when the Greeley, Salt Lake, & Pacific narrow gauge railroad was built in the early 1880s. Today, most of Salina's original structures still stand, including the one-room schoolhouse, Salina School, and church, the Little Church in the Pines, despite some impact from the Fourmile Canyon wildfire in 2010 and historic flooding during the 2013 Colorado floods.

The Little Church in the Pines is a c. 1902-1908 building in the former mining town of Salina in Boulder County, Colorado. The church held regular Sunday School classes for children, and services whenever a traveling minister came to town. As the mining boom came to an end and the town's population shrunk, the building fell into disuse, and briefly served as a mine office before being abandoned. In 1948 it was purchased by a neighborhood group and has been used ever since for nondenominational worship and community events. The Little Church in the Pines was placed on the National Register of Historic Places in 1989. During the 2013 Colorado floods, the ground washed out from underneath half of the building, including the bell tower, and emergency supports had to be installed to stabilize the structure until a new foundation could be built and the area refilled.

The Salina School, also known as the Salina Schoolhouse, is a one-room schoolbuilding in the former mining town of Salina in Boulder County, Colorado, built around 1875 or 1876. It was listed on the National Register of Historic Places in 1989. Throughout the mining boom, the schoolhouse functioned as a hub of social activity in Salina, hosting dances, box socials, and other community activities. Today the building is owned by the Salina Community Association, a nonprofit group of local residents, and maintained as a space for classes, films, concerts, and other community events.

Crisman 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 Crisman CDP was 179 at the United States Census 2020. The Boulder post office (Zip Code 80302) serves the area.

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.