Castle Rock, CO Demographics

A map of Castle Rock's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	61,562	57,509	77.8%	78.6%
Hispanic	9,234	8,536	11.7%	11.7%
Multiracial	4,980	3,921	6.3%	5.4%
Asian	2,008	1,588	2.5%	2.2%
Native American/Other	739	640	0.9%	0.9%
Black	600	964	0.8%	1.3%

Castle Rock, Colorado has an estimated population of 79,123, an increase from the 73,158 recorded in the 2020 Census. The population is 77.8% White, 11.7% Hispanic, 6.3% Multiracial, 2.5% Asian, 0.9% Native American/Other, and 0.8% Black. This demographic dot map shows the population of Castle Rock, with one dot drawn for each person counted by the Census, color-coded by race.

Castle Rock has become more racially diverse since the 2020 Census. It is considerably less diverse than Colorado overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Castle Rock, that probability was 36.5% in 2020 and 37.6% in the most recent ACS estimates.

Castle Rock is ranked the 15th most populous place in Colorado, out of 482 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Castle Rock was ranked the 17th most populous place in the 2020 Census.

Castle Rock's White Population

61,562 residents of Castle Rock, or 77.8% of the population, identify as White. The share of White residents in Castle Rock is considerably higher than in Colorado overall, where 64.8% of the population is White. Castle Rock ranks 251st statewide in terms of White residents as a share of the population, out of 482 places.

Since the 2020 Census, Castle Rock's White population has grown by an estimated 7.0%. White residents' share of Castle Rock's population has decreased from 78.6% to 77.8%.

Castle Rock is less White than neighboring Castle Pines Village (88.3% White), Castle Pines (78.6% White), Franktown (97.5% White), The Pinery (78.9% White), and Sedalia (100% White).

Castle Rock's Black Population

600 residents of Castle Rock, or 0.8% of the population, identify as Black. The share of Black residents in Castle Rock is slightly lower than in Colorado overall, where 3.8% of the population is Black. Castle Rock ranks 82nd statewide in terms of Black residents as a share of the population, out of 482 places.

Since the 2020 Census, Castle Rock's Black population has declined by an estimated 37.8%. Black residents' share of Castle Rock's population has decreased from 1.3% to 0.8%.

Castle Rock is more Black than neighboring Castle Pines Village (0.2% Black), and Sedalia (0% Black). Castle Rock is less Black than neighboring Castle Pines (4.4% Black), and Franktown (2.5% Black).

Castle Rock's Asian Population

2,008 residents of Castle Rock, or 2.5% of the population, identify as Asian. The share of Asian residents in Castle Rock is comparable to the share in Colorado overall, where 3.2% of the population is Asian. Castle Rock ranks 94th statewide in terms of Asian residents as a share of the population, out of 482 places.

Since the 2020 Census, Castle Rock's Asian population has grown by an estimated 26.4%. Asian residents' share of Castle Rock's population has remained roughly unchanged at 2.5%.

Castle Rock is more Asian than neighboring Castle Pines Village (2% Asian), Franktown (0% Asian), and Sedalia (0% Asian). Castle Rock is less Asian than neighboring Castle Pines (3.5% Asian), and The Pinery (4.6% Asian).

Castle Rock's Hispanic Population

9,234 residents of Castle Rock, or 11.7% of the population, identify as Hispanic. The share of Hispanic residents in Castle Rock is considerably lower than in Colorado overall, where 22.5% of the population is Hispanic. Castle Rock ranks 242nd statewide in terms of Hispanic residents as a share of the population, out of 482 places.

Since the 2020 Census, Castle Rock's Hispanic population has grown by an estimated 8.2%. Hispanic residents' share of Castle Rock's population has remained roughly unchanged at 11.7%.

Castle Rock is more Hispanic than neighboring Castle Pines Village (5.9% Hispanic), Castle Pines (9.2% Hispanic), Franktown (0% Hispanic), and Sedalia (0% Hispanic). Castle Rock is less Hispanic than neighboring The Pinery (11.8% Hispanic).

Castle Rock's Native American/Other Population

739 residents of Castle Rock, or 0.9% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Castle Rock is comparable to the share in Colorado overall, where 1% of the population is Native American/Other. Castle Rock ranks 276th statewide in terms of Native American/Other residents as a share of the population, out of 482 places.

Since the 2020 Census, Castle Rock's Native American/Other population has grown by an estimated 15.5%. Native American/Other residents' share of Castle Rock's population has remained roughly unchanged at 0.9%.

Castle Rock is more Native American/Other than neighboring Castle Pines (0.5% Native American/Other), Franktown (0% Native American/Other), The Pinery (0.3% Native American/Other), and Sedalia (0% Native American/Other). Castle Rock is less Native American/Other than neighboring Castle Pines Village (1.6% Native American/Other).

Castle Rock's Multiracial Population

4,980 residents of Castle Rock, or 6.3% of the population, identify as Multiracial. The share of Multiracial residents in Castle Rock is comparable to the share in Colorado overall, where 4.6% of the population is Multiracial. Castle Rock ranks 94th statewide in terms of Multiracial residents as a share of the population, out of 482 places.

Since the 2020 Census, Castle Rock's Multiracial population has grown by an estimated 27.0%. Multiracial residents' share of Castle Rock's population has increased from 5.4% to 6.3%.

Castle Rock is more Multiracial than neighboring Castle Pines Village (2.1% Multiracial), Castle Pines (3.8% Multiracial), Franktown (0% Multiracial), The Pinery (3.6% Multiracial), and Sedalia (0% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.