Allenspark is a census-designated place (CDP) in Boulder County, Colorado, United States. The population was 528 at the 2010 census. The Allenspark Post Office has the ZIP code 80510. Allenspark is located in northwest Boulder County at 40129N1053048W / 40.20250N 105.51333W / 40.20250; -105.51333 (40.202416, -105.513341), within Roosevelt National Forest in the Front Range of the Colorado Rockies. The western edge of the community is the boundary of Rocky Mountain National Park. State Highway 7 passes through the community, leading north 15 miles (24km) to Estes Park and east 19 miles (31km) to Lyons. The center of Allenspark is at an elevation of 8,500 feet (2,600m) above sea level.