Evergreen is in Jefferson County, in the Denver metro area. The latitude of Evergreen is 39.633N. The longitude is -105.316W. Elevation is 7,054 feet. Evergreen is a census-designated place (CDP) and a U.S. Post Office in Jefferson County, Colorado, United States. Evergreen is roughly 15 miles (24 kilometers) west of the City and County of Denver. The population was 9,216 at the 2000 census. The Evergreen Post Office has the ZIP Codes 80437 and 80439.

Homesteader Thomas Bergen arrived in 1859, establishing a ranch and stage stop north of present-day downtown Evergreen. Bergen's Ranch was recognized as a settled area at the establishment of Jefferson County, Jefferson Territory. Subsequent settlers homesteaded south of Bergen along Bear Creek Canyon and the downtown area grew around the confluence of Cub Creek and Bear Creek. Fellow homesteader Dwight P. Wilmot is credited with naming the area "Evergreen"; his home has been preserved and still functions as a private residence across the street from his namesake Wilmot Elementary School. The town grew on the lumber demand for buildings in Denver and by the 1880s, the town could boast a population of 200 people and six operating sawmills. Improvement of the road from Denver up Bear Creek Canyon in 1911 and electrical service reaching the town in 1917 spurred further growth and the town became a popular summer destination for Denver residents.

Resorts like Troutdale-in-the-Pines, Greystone Guest Ranch and the Brook Forest Inn opened and entertained Denverites and celebrities including film stars of the day and Presidents Franklin D. Roosevelt and Theodore Roosevelt, who both vacationed at the Troutdale. In the 1950s, improved utilities in town and the rising popularity of automobiles began to entice more future residents to stay year-round and the town became known as a commuter community.

Since Evergreen is an unincorporated area, services usually provided by a city's government are provided by multiple agencies. The county maintains the roads (less State Highway 74), oversees planning and zoning, provides primary and secondary education through its school district and provides law enforcement through its sheriff's office. Evergreen Fire/Rescue provides fire protection and emergency medical response service. Water and sewer services operate under the administration of the Evergreen Metropolitan District.