Boulder Geomagnetic Observatory

Ryssby Church is a church located outside of Longmont, Boulder County, Colorado. The church was built in 1882 by Swedish immigrants, although it fell into disuse between 1914 and 1924. A dedicated committee from the First Evangelical Lutheran Church, the descendant congregation of the Ryssby and Elim churches, maintains the church, organizes events, and funds continuous improvement projects. The church hosts weddings, church picnics, an annual Midsummer service, and Christmas candlelight services in early December.

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.

Boulder Reservoir is located in the northern part of Boulder, Colorado. It stores water for the Northern Colorado Water Conservancy District — also called Northern Water — and for the City of Boulder. The reservoir is the centerpiece of the Boulder Reservoir Regional Park, which is managed by the City of Boulder's Department of Parks and Recreation. The reservoir receives most of its water from Colorado's Western Slope through the Alva B. Adams Tunnel and the Boulder Feeder Canal, both part of the Colorado-Big Thompson Project. Some of the stored water is used as part of Boulder's municipal water supply and some is used for agricultural purposes in Boulder and Weld counties.

Silver Creek High School is a public high school located in Longmont, Colorado. It is part of the St. Vrain Valley School District. Silver Creek hosts Universal High School, an independent learning program, and the Silver Creek Leadership Academy.

Left Hand Canyon is a canyon, near Boulder, Colorado, United States.

The Leanin' Tree Museum of Western Art was a private art museum located in Boulder, Colorado. It exhibited the private art collection of Ed Trumble, founder and chairman of Leanin' Tree, Incorporated. Trumble is a publisher of fine art greeting cards since 1949. The collection also included American western art spanning five decades. The museum closed forever on August 31, 2017

Vance Brand Airport (ICAO: KLMO, FAA LID: LMO, formerly AMR) is a city-owned public-use airport located three nautical miles (6 km) southwest of the central business district of Longmont, in Boulder County, Colorado, United States. The Airport is named after former NASA astronaut Vance Brand. Although many U.S. airports use the same three-letter location identifier for the FAA and IATA, this facility is assigned LMO by the FAA but has no designation from the IATA (which assigned LMO to RAF Lossiemouth in Lossiemouth, Scotland).

Hygiene is an unincorporated community with a U.S. Post Office in Boulder County, Colorado, United States. Application for the first Hygiene Post Office was made by Jacob Stoner Flory of the United Church of the Brethren on May 28, 1883. Originally named Pella, the community's present name stems from a time when it had a sanatorium to work with tuberculosis patients. St. Vrain Church of the Brethren, a historic Church of the Brethren congregation, is located in the town.

The Church of the Brethren, also known as the St. Vrain Church of the Brethren and the Old Dunkard Church, is an historic Church of the Brethren meeting house located on Hygiene Road (17th Avenue) in Hygiene in the St. Vrain Valley of Boulder County, Colorado. In 1874, formal organization of the Church of the Brethren was held at the ranch home of Mr. and Mrs. J. R. Ullery led by the itinerant preacher, James R. Gish. The first influx of Brethren came to Colorado from Iowa, settling south of Hygiene in Pella, Colorado. Rev. Jacob S. Flory left Greeley, Colorado with his wife and eight children to carry on the work of the church.In 1879, land was donated for the church. In 1880, the building was erected of rough cut stone, which came from Lyons and was laid in courses of unequal thickness. The total cost of construction, including donated labor, was $2,000. The Hygiene Cemetery surrounded the church, with the original Pella Cemetery lying to the south. Church services were suspended in 1907.In 1984, the church building and the land surrounding it were added to the National Register of Historic Places. In 2004, the Hygiene Dunkard Church was awarded Landmark status in Boulder County.In 2009, the church was deeded to the Hygiene Cemetery Association, which began the work of restoring it. It is the oldest Brethren church still standing in Colorado.

Niwot is an unincorporated town, a post office, and a census-designated place (CDP) located in and governed by Boulder County, Colorado, United States. The CDP is a part of the Boulder, Colorado Metropolitan Statistical Area. The Niwot post office has the ZIP Codes 80503 and 80544 (for post office boxes). At the United States Census 2020, the population of the Niwot CDP was 4,306.

The North St. Vrain Creek Bridge, in Lyons, Colorado, was built in 1955. It was listed on the National Register of Historic Places in 2002.It brings State Highway 7, at its milepost 32.98, over the North St. Vrain Creek. It is a single-span road bridge designed by the U.S. Bureau of Public Roads and built in 1955 by Lowdermilk Brothers contractors. It is a concrete rigid frame bridge. The span is 60 feet (18 m) long; the roadway 30 feet (9.1 m) wide in a structure that is 66 by 37.30 feet (20.12 m × 11.37 m) overall.It is located on the southern side of Lyons.

Lyons is a Statutory Town in Boulder County, Colorado, United States. The town population was 2,209 at the 2020 United States Census, up from 2,033 at the 2010 United States Census. Lyons is located at the confluence of North St. Vrain Creek and South St. Vrain Creek, 20 miles (32 km) east of Rocky Mountain National Park. Due to its location at the intersection of State Highway 7 and U.S. Highway 36 which lead to Rocky Mountain National Park, it is sometimes referred to as "The Double Gateway to the Rockies".