Castle Rock, Colorado Population 2021

75,452
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Castle Rock is a city located in Colorado. With a 2020 population of 75,452, it is the 15th largest city in Colorado and the 481st largest city in the United States. Castle Rock is currently growing at a rate of 4.84% annually and its population has increased by 56.44% since the most recent census, which recorded a population of 48,231 in 2010. Castle Rock reached it's highest population of 75,452 in 2021. Spanning over 34 miles, Castle Rock has a population density of 2,200 people per square mile.

The average household income in Castle Rock is $127,791 with a poverty rate of 3.89%. The median rental costs in recent years comes to $1,536 per month, and the median house value is $422,100. The median age in Castle Rock is 35.8 years, 35 years for males, and 36.6 years for females. For every 100 females there are 98.3 males.

Castle Rock Demographics

According to the most recent ACS, the racial composition of Castle Rock was:

  • White: 91.38%
  • Two or more races: 2.74%
  • Other race: 2.45%
  • Asian: 1.82%
  • Black or African American: 1.08%
  • Native American: 0.36%
  • Native Hawaiian or Pacific Islander: 0.17%
The current population of Castle Rock, Colorado is 75,452, based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 65,000.The last official US Census in 2010 recorded the population at 48,231.

Castle Rock, Colorado Population 2021

Population by Race

Race Population Percentage
White57,03891.38%
Two or More Races1,7132.74%
Some Other Race1,5312.45%
Asian1,1341.82%
Black or African American6721.08%
American Indian and Alaska Native2250.36%
Native Hawaiian and Other Pacific Islander1040.17%
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Castle Rock Population by Race

Castle Rock Population Pyramid 2021

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Castle Rock Median Age

35.8


Total

35


Male

36.6


Female

Castle Rock Adults

There are 44,446 adults, (6,212 of whom are seniors) in Castle Rock.

Castle Rock Age Dependency

63.2

Age Dependency Ratio

16.2

Old Age Dependency Ratio

47

Child Dependency Ratio

Castle Rock Sex Ratio

Female

31,469

50.42%

Male

30,948

49.58%

Castle Rock Population by Age

Castle Rock Renter vs Owner Occupied by Household Type

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Castle Rock Household Types

Type Owner Renter
Married88.8%11.2%
All77.7%22.3%
Male63.4%36.6%
Non Family56%44%
Female55.5%44.5%

77.7%

Rate of Home Ownership

Castle Rock Households and Families

Type Count Average Size Owned
All21,3362.8977.7
Married13,9093.4488.8
Non Family4,7831.3156
Female1,6912.7855.5
Male9533.1863.4

3.29

Average Family Size

2.89

Average Household Size

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Castle Rock Households by Type

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Education Attained Count Percentage
Less Than 9th Grade3420.86%
9th to 12th Grade6291.59%
High School Graduate5,72314.46%
Some College9,50624.02%
Associates Degree4,28710.83%
Bachelors Degree12,95332.73%
Graduate Degree6,13215.50%
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Castle Rock Educational Attainment by Sex (over 25)

Castle Rock Educational Attainment by Race

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Name Total High School Bachelors
White33,76433,23416,597
Hispanic3,6573,2861,393
Other Race1,028905318
Asian861816477
Multiple Races666655357
Black410385194
Native American15614715
Islander717129

The highest rate of high school graduation is among islander people with a rate of 100.00%.

The highest rate of bachelors degrees is among asian people with a rate of 55.40%.

Castle Rock Educational Attainment by Race

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Name Average Male Female
Overall$57,183$74,614$42,672
Less Than High School$30,438$32,500$
High School Grad$40,101$45,370$30,907
Some College$49,725$63,211$37,109
Bachelors Degree$66,641$89,411$48,592
Graduate Degree$84,417$109,034$62,566

$57,183

Average Earnings

$74,614

Average Male

$42,672

Average Female

Castle Rock Earnings by Educational Attainment

Castle Rock Language by Age

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Castle Rock Language

92.51% of Castle Rock residents speak only English, while 7.49% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 4.73% of the population.

Castle Rock Language

Castle Rock Poverty by Race

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Name Total In Poverty Poverty Rate
White51,8421,6433.17%
Hispanic6,2835709.07%
Black65113019.97%
Multiple1,685472.79%
Asian1,121454.01%
Other1,421181.27%
Native181179.39%
Islander10421.92%

3.89%

Overall Poverty Rate

3.30%

Male Poverty Rate

4.47%

Female Poverty Rate

Poverty in Castle Rock

The race most likely to be in poverty in Castle Rock is Black, with 19.97% below the poverty level.

The race least likely to be in poverty in Castle Rock is Other, with 1.27% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.45%. Among those working part-time, it was 4.37%, and for those that did not work, the poverty rate was 7.65%.

Castle Rock Poverty

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Name Poverty
Less Than High School12.98%
High School6.36%
Some College2.68%
Bachelors or Greater2.26%

Castle Rock Poverty Rate by Education

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Name Poverty
Female Unemployed9.92%
Female Employed3.11%
Male Unemployed2.60%
Male Employed1.88%

Castle Rock Poverty Rate by Employment Status and Sex

Castle Rock Income by Household Type

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Name Median Mean
Households$109,700$127,791
Families$125,786$144,068
Married Families$134,264-
Non Families$53,514$65,382
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Income by Household Type

Castle Rock Marital Status

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Marriage Rates

61.1%

Overall Marriage Rate

62.9%

Male Marriage Rate

59.4%

Female Marriage Rate

Castle Rock Married by Age and Sex

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Castle Rock Marriage

The age group where males are most likely to be married is 45-54, while the female age group most likely to be married is 35-44.

Castle Rock Marital Status by Race

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Castle Rock Marital Status

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4,405

Number of Veterans

3,711

Male Veterans

694

Female Veterans

War Veterans
First Gulf War1,823
Second Gulf War1,562
Vietnam994
Korea210
World War II72

Castle Rock Veterans by War

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Age Group Veterans
35 to 542,091
65 to 74698
75+613
18 to 34526
55 to 64477

Castle Rock Veterans by Age

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Name Veterans % of Total
White4,0609.96%
Hispanic3407.84%
2 or More17623.69%
Black6614.16%
Other625.21%
Indian4126.28%

Castle Rock Veterans by Race

Castle Rock Veterans by Education

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2.15%

Veteran Poverty Rate

19.35%

Veteran Disability Rate

Castle Rock Veterans by Education

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74.3%

Labor Force Participation

71.8%

Employment Rate

2.9%

Unemployment Rate

Castle Rock Employment by Age

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Castle Rock Employment by Race

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Castle Rock Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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37.92%

Born in Colorado

94.97%

Native Born

5.03%

Foreign Born

2.28%

Non Citizen

2.75%

Naturalized

Place of Birth

94.97% of Castle Rock residents were born in the United States, with 37.92% having been born in Colorado. 2.28% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Castle Rock Place of Birth

Year Population Growth Annual Growth Rate
202175,4523,4844.84%
202071,9683,4845.09%
201968,4843,4845.36%
201865,0002,7034.34%
201762,2973,0135.08%
201659,2842,1093.69%
201557,1752,0213.66%
201455,1542,4974.74%
201352,6571,6403.21%
201251,0171,3242.66%
201149,6931,1072.28%
201048,58628,3629.16%
200020,22411,5168.79%
19908,7084,7878.31%
19803,9212,42110.09%
19701,5003002.26%
19601,2005005.54%
19507001001.55%
19406000.00%

Castle Rock Population by Year