Town · Colorado
Castle Rock, Colorado
Castle Rock, town, in Douglas County, Colorado. Castle Rock had 83,815 residents on July 1, 2025 by the Census Bureau's estimate, up 14.6% since 2020; the 2020 Census counted 73,158 and the ACS 2020-2024 5-year estimates put it at 79,123 (±51). GEOID 0812415.
Residents, July 2025 estimate
83,815
Census Bureau estimate (no margin published)
2020 Census count: 73,158 · ACS 2020-2024: 79,123 ±51
Median household income
$145,197
±$7,924 (90% margin)
Colorado: $95,470
Median home value
$652,900
±$8,994 (90% margin)
Colorado: $539,400
Median gross rent
$2,000
±$107 (90% margin)
Colorado: $1,761
Where is Castle Rock and what county is it in?
Castle Rock is a town in Douglas County, Colorado. It covers 34.7 square miles of land, 2,106 residents per square mile in 2020.
Castle Rock is in the Denver-Aurora-Centennial, CO metropolitan statistical area, which takes in 10 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Castle Rock, and is it growing?
The Census Bureau estimates that 83,815 people lived in Castle Rock on July 1, 2025, up 14.6% since 2020, faster than Colorado (+4.1%). The 2020 Census counted 73,158 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 79,123 (±51).
| Measure | Castle Rock | Douglas County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 79,123 ±51 | 377,150 | +16,706 |
| Households | 28,219 ±608 | 139,960 | +6,883 |
| Average household size | 2.78 ±0.06 | 2.69 | −0.11 |
| Housing units | 29,159 ±611 | 144,432 | +7,168 |
Castle Rock's population since 2000
From 20,224 in 2000 to 83,815 in 2025: up 314.4%. The 2000, 2010 and 2020 figures are census counts, each for Castle Rock as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Castle Rock?
The median resident of Castle Rock is 36.5 years old; 26.1% are under 18 and 11.4% are 65 or older. The largest group is non-Hispanic white residents at 77.8%, then Hispanic or Latino residents (of any race) at 11.7%. 5.6% of residents were born outside the United States.
| Measure | Castle Rock | Douglas County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 36.5 ±0.8 | 39.6 | no clear change |
| Under 18 years | 26.1% ±1.0 pts | 23.4% | – |
| 65 years and over | 11.4% ±0.9 pts | 13.9% | – |
| Male | 49.5% ±1.0 pts | 50.3% | – |
| Hispanic or Latino (any race) | 11.7% ±1.2 pts | 10.2% | no clear change |
| White alone, not Hispanic | 77.8% ±1.9 pts | 77.0% | −6.0 pts |
| Black or African American alone, not Hispanic | 0.8% ±0.3 pts | 1.3% | no clear change |
| Asian alone, not Hispanic | 2.5% ±0.8 pts | 5.8% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.1% ±0.1 pts | 0.2% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.1% ±0.1 pts | 0.1% | – |
| Two or more races, not Hispanic | 6.3% ±1.1 pts | 4.9% | – |
| Some other race alone, not Hispanic | 0.7% ±0.4 pts | 0.5% | – |
| Born outside the United States | 5.6% ±1.0 pts | 8.4% | no clear change |
| Speak a language other than English at home (age 5+) | 8.2% ±1.5 pts | 10.4% | – |
| Civilian veterans (age 18+) | 7.5% ±0.9 pts | 7.2% | – |
| With a disability | 7.5% ±1.0 pts | 8.1% | – |
| No health insurance coverage | 4.8% ±1.0 pts | 3.9% | no clear change |
| High school graduate or higher (age 25+) | 97.1% ±0.9 pts | 97.9% | – |
| Bachelor's degree or higher (age 25+) | 55.9% ±2.0 pts | 62.0% | +7.7 pts |
| Graduate or professional degree (age 25+) | 18.8% ±1.8 pts | 22.5% | – |
| Lived in the same house a year earlier | 84.4% ±2.1 pts | 85.1% | – |
| Moved from another state in the past year | 4.6% ±1.1 pts | 4.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Castle Rock earn?
Half of Castle Rock's 28,219 households earn less than $145,197 a year (±$7,924), against $149,594 in Douglas County and $95,470 in Colorado. In 2015-2019 the median was $135,007 in 2024 dollars, so it rose by $10,190 after inflation. 3.8% of residents live below the poverty line.
| Measure | Castle Rock | Douglas County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $145,197 ±$7,924 | $149,594 | +$10,190 |
| Mean household income | $171,148 ±$7,682 | $183,544 | – |
| Per capita income | $62,170 ±$2,832 | $69,608 | +$7,712 |
| People below the poverty line | 3.8% ±0.9 pts | 3.8% | no clear change |
| Children under 18 below the poverty line | 2.9% ±1.3 pts | 3.0% | no clear change |
| Households receiving SNAP | 3.0% ±0.8 pts | 2.1% | – |
| Households with a computer | 98.4% ±0.8 pts | 98.9% | – |
| Households with a broadband subscription | 97.7% ±0.9 pts | 97.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Castle Rock?
Owners occupy 78.8% of Castle Rock's occupied homes and renters 21.2%. The median owner-occupied home is valued at $652,900 by its owner (±$8,994). The median renter pays $2,000 a month including utilities, and 51.1% of renters pay 35% or more of their income on rent.
| Measure | Castle Rock | Douglas County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $652,900 ±$8,994 | $713,600 | +$133,424 |
| Median gross rent | $2,000 ±$107 | $2,193 | no clear change |
| Renters paying 35% or more of income on rent | 51.1% ±6.7 pts | 41.2% | +13.7 pts |
| Median monthly owner costs, with a mortgage | $2,787 ±$51 | $2,893 | – |
| Owner-occupied homes | 78.8% ±2.0 pts | 77.4% | no clear change |
| Renter-occupied homes | 21.2% ±2.0 pts | 22.6% | – |
| Housing units | 29,159 ±611 | 144,432 | +7,168 |
| Homeowner vacancy rate | 0.7% ±0.7 pts | 0.5% | – |
| Rental vacancy rate | 4.0% ±3.4 pts | 4.4% | – |
| Single-family detached homes | 73.7% ±2.1 pts | 73.4% | – |
| Mobile homes | 0.5% ±0.2 pts | 0.3% | – |
| Built 2020 or later | 8.3% ±1.0 pts | 6.0% | – |
| Built 2010 to 2019 | 30.8% ±2.1 pts | 21.0% | – |
| Built 1939 or earlier | 0.3% ±0.2 pts | 0.5% | – |
| Households with no vehicle | 2.3% ±0.8 pts | 2.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Castle Rock building?
Builders took permits for 261 new housing units in Castle Rock in 2025 (261 in single-family houses), 3.1 per 1,000 residents against 5.6 across Colorado.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Castle Rock work and get to work?
62.9% of Castle Rock's workers drive alone and 28.8% work from home. The average trip to work takes 28.6 minutes. The unemployment rate in 2020-2024 averaged 4.4%.
| Measure | Castle Rock | Douglas County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 74.6% ±1.5 pts | 71.9% | – |
| Unemployment rate | 4.4% ±1.3 pts | 3.6% | +1.5 pts |
| Drove alone to work | 62.9% ±2.5 pts | 61.9% | – |
| Carpooled | 5.3% ±1.1 pts | 4.9% | – |
| Public transportation | 0.1% ±0.1 pts | 0.6% | – |
| Walked | 1.7% ±0.6 pts | 1.2% | – |
| Worked from home | 28.8% ±2.2 pts | 30.5% | +18.9 pts |
| Mean travel time to work | 28.6 min ±1.2 | 27.1 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Castle Rock?
10 census tracts lie mostly in Castle Rock, and 6 more reach into it (2020 census blocks). Their median household incomes run from $92,188 (Tract 145.04) to $248,333 (Tract 144.09).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 144.10Douglas County | 13,618 | $150,081 |
| Tract 140.13Douglas County | 14,580 | $181,386 |
| Tract 146.03Douglas County | 7,469 | $150,545 |
| Tract 144.05Douglas County | 7,651 | $155,044 |
| Tract 145.03Douglas County | 5,893 | $109,965 |
| Tract 145.04Douglas County | 5,945 | $92,188 |
| Tract 145.06Douglas County | 9,739 | $182,524 |
| Tract 145.05Douglas County | 5,935 | $109,173 |
| Tract 146.04Douglas County | 4,640 | $164,688 |
| Tract 144.09Douglas County | 3,799 | $248,333 |
| Tract 140.17Douglas County | 2,959 | $161,250 |
| Tract 141.23Douglas County | 4,189 | $97,207 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Castle Rock) · Census block assignment files
How does Castle Rock compare with other places in Colorado?
By the Census Bureau's July 2025 estimates, Castle Rock is the 437th-most populous of the 19,476 U.S. incorporated places that have one and the 14th-most populous of 272 in Colorado.
Castle Rock ranks 29th of 218 places in Colorado with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 14th | 272 |
| Growth 2020-2025 (PEP) | 23rd | 150 |
| Residents per square mile | 65th | 221 |
| Median household income | 29th | 218 |
| Per capita income | 58th | 220 |
| Median home value | 64th | 217 |
| Median gross rent | 50th | 200 |
| Poverty rate | 139th | 151 |
| Bachelor's degree or higher | 66th | 216 |
| Median age | 137th | 220 |
| Owner-occupied share | 76th | 218 |
| Work from home | 42nd | 176 |
| Travel time to work | 58th | 221 |
Castle Rock's figures with every place in Colorado (CSV)
Every place in Colorado, sortable · Compare Castle Rock with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Castle Rock?
6 of the 57 figures for Castle Rock on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Castle Rock are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Castle Rock.