Castle Rock, Colorado Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Castle Rock, CO Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
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A+
Health Top grade
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A+
Income Top grade
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A
Education Above average
Source: Map AI Methodology
Population
| Metric | Castle Rock | Colorado Avg | U.S. Average |
|---|---|---|---|
| Population | 44,444 | 5,842,429 | 337,468,954 |
| Population density (per sq mi) | 1279.3 | 56.1 | 86.4 |
| Population growth (%/yr) | 6.00% | 1.09% | 0.59% |
| Median age | 38.1 | 35.2 | 37.3 |
| Households | 16,173 | 2,364,171 | 130,235,071 |
Population in Castle Rock grew by 152.7% from 2009 to 2024, reaching 44,444 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Castle Rock is Millennials, aged 29–44, at 25.2% of residents. That is 1.0 points above Colorado as a whole.
- Gen Z 13–28 8,542 19.2% -3.4 pts
- Millennials 29–44 11,203 25.2% +1.0 pts
- Gen X 45–60 9,667 21.8% +2.0 pts
- Boomers 61–79 5,067 11.4% -3.8 pts
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Colorado, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 50.4% of the people living in Castle Rock and men 49.6%.
- Women 50.4% Colorado 49.4%
- Men 49.6% Colorado 50.6%
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Economy
Castle Rock has a the economy index of A+, which means it is exceptionally prosperous.
| Metric | Castle Rock | Colorado Avg | U.S. Average |
|---|---|---|---|
| Median household income | $139,370 | $95,803 | $80,455 |
| Income growth (%/yr) | 4.93% | 5.41% | 4.80% |
| Unemployment rate | 4.6% | 4.6% | 5.2% |
The median household income in Castle Rock is about 45% higher than in Colorado.
Housing
| Metric | Castle Rock | Colorado Avg | U.S. Average |
|---|---|---|---|
| Median home price | $646,376 | $484,034 | $248,835 |
| Median rent | $2,015 | $1,761 | $1,407 |
| Homeownership rate | 77.6% | 66.2% | 65.2% |
The median home price in Castle Rock is about 26.7 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $2,015 per month for that long.
Commute Time & Mobility
Commuters in Castle Rock spend about 51 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 211 hours, about 8.8 full days, spent commuting.
| Metric | Castle Rock | Colorado Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 25.3 | 22.0 | 22.4 |
| Round-trip commute (min) | 50.7 | 44.1 | 44.8 |
| Yearly time spent (hours) | 211 | 184 | 187 |
| Estimated yearly cost | $6,544 | $5,694 | $5,790 |
| Work from home | 27.7% | 21.0% | 15.0% |
| Highway traffic (vehicles/day) | 16,401 | 8,183 | 8,813 |
| Local road traffic (vehicles/day) | 2,522 | 1,277 | 1,355 |
The average commute time in Castle Rock is 25 minutes, longer than the 22 minutes in Colorado.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
Castle Rock has a education index of A, which means it is very educated.
| Metric | Castle Rock | Colorado Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 49.0% | 40.3% | 31.6% |
| Average household size | 2.72 | 2.42 | 2.53 |
Health
Castle Rock has a health index of A+, which means it is exceptionally healthy.
| Metric | Castle Rock | Colorado Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 80.7 | 80.0 | 78.3 |
| Self-rated poor health | 8.2% | 13.2% | 16.3% |
| Smokers | 12.3% | 16.1% | 19.0% |
Frequently Asked Questions
Common questions about Castle Rock, Colorado.
How many people live in Castle Rock, Colorado?
About 44,444 people live in Castle Rock, Colorado, in 16,173 households of 2.7 people on average. The median age is 38.1, close to the U.S. median of 37.3.
Is Castle Rock, Colorado mostly urban or rural?
Averaged over its land area, Castle Rock, Colorado has 1,279 people per square mile, a density typical of urban and suburban areas. That is about 15 times the U.S. average of 86.
How affordable is housing in Castle Rock, Colorado?
The median home costs 4.6 times the median household income ($646,376 against $139,370), compared with 3.1 times nationally. A ratio of about 3 is traditionally considered affordable. Median rent of $2,015 a month takes about 17% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
How common is a college degree in Castle Rock, Colorado?
49.0% of adults in Castle Rock, Colorado hold a bachelor's degree or higher (about 1 in 2), well above the U.S. share of 31.6%.
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