Castle Rock, Colorado

Castle Rock population, 2020 to 2024

Castle Rock added 9,325 residents from July 2020 to July 2024, a change of +12.6%. In the latest year it moved by +1,559. Among 79 Colorado places of 5,000 or more, that growth ranks 15th; the median place changed by +3.0%. The median place of 5,000+ in Colorado has 14,061 people, so Castle Rock is 5.9 times that size.

Castle Rock covers 34.74 square miles of land, for 2,395 people per square mile of land. The median Colorado place of 5,000+ has 1,848, so Castle Rock is denser than the typical town.

What county Castle Rock is in

All of Castle Rock's residents live in Douglas County, which had 393,995 residents in 2024. Castle Rock holds 21.1% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Castle Rock

3 ZIP Code Tabulation Areas (ZCTAs) overlap Castle Rock by at least 10% of the ZCTA's or the town's land: 80104, 80108, 80109. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a town that annexed land after 2020 may reach into ZIP codes not listed here.

Where Castle Rock is

The Census internal point of Castle Rock is at 39.376200, -104.852900. Denver, the capital, is 26.0 miles NNW in a straight line. The nearest larger place is Centennial, CO (108,853 people), 14.9 miles away.

Daylight in Castle Rock

At 39.38° N, Castle Rock gets about 14 h 57 min of daylight around the June solstice and 9 h 23 min around the December solstice, a swing of 5 h 33 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Castle Rock

The eight nearest incorporated places of 1,000+ in Colorado, measured between internal points. The closest is Castle Pines, 6.0 miles away, with 15,162 people.