80109 ZIP Code — Castle Rock, CO

Douglas County, Colorado

ZIP code 80109 is located in Castle Rock, Colorado, within Douglas County. It covers approximately 25.99 square miles and serves a population of 27,852 residents. This is a standard ZIP code in the Mountain (MT) timezone, served by area code 720/303.

About ZIP code 80109

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 2000s, giving the area an established character. Median home value is $615,200. Owner-occupancy is high at 82%, well above the national average.

Median household income is $144,034. The poverty rate of 3% is below the national average.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 30 minutes is near the national average. Remote work is prevalent — 23% of workers work from home.

Educational attainment is high — 58% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 80109 reflects a community defined by a highly educated population, high homeownership, and a high rate of remote workers.

27,852

population

25.99

sq mi land

Standard

ZIP type

Mountain (MT)

timezone

80109 ZIP code map

Cities in ZIP code 80109

Below are the cities the US Postal Service accepts for ZIP code 80109. Using any city not on this list may result in mail delivery delays.

City	Status
Castle Rock	Preferred

Nearby ZIP codes

80108 Castle Rock (6.4 mi) 80104 Castle Rock (6.5 mi) 80118 Larkspur (10.4 mi) 80124 Lone Tree (10.5 mi) 80116 Franktown (10.9 mi) 80125 Littleton (11 mi) 80134 Parker (11.5 mi) 80126 Littleton (11.8 mi) 80130 Littleton (12.1 mi) 80129 Littleton (13.3 mi) 80112 Englewood (14.1 mi) 80135 Sedalia (14.5 mi)

Demographics updated 05/2026

Population
Total population	27,852
Population density	1,072 / sq mi
State FIPS	08
County FIPS	035

Geography
Land area	25.99 sq mi
Water area	0.01 sq mi
Latitude	39.3656
Longitude	-104.9123
Timezone	Mountain (MT)
Area code	720/303

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	13.3%	14.5%	32.5%
$50k – $100k	22.9%	24.3%	31.0%
$100k – $200k	44.5%	39.5%	26.9%
Over $200k	19.3%	21.8%	9.6%

Demographics & statistics

27,852

Population

1,072

People per sq mi

35.1

Median age

$144,034

Median household income

$55,788

Per capita income

$615,200

Median home value

$1,933

Median monthly rent

81.6%

Home ownership

2.6%

Poverty rate

5.6%

Unemployment

7,686

Housing units

57.9%

Bachelor's or higher

Age distribution

Male Female

1,036

Under 5

1,005

1,502

5–9

1,457

967

10–14

938

1,105

15–19

1,072

729

20–24

707

1,702

25–34

1,651

2,199

35–44

2,132

2,025

45–54

1,965

747

55–59

725

792

60–64

769

720

65–74

699

410

75–84

398

203

85+

197

← Male

Female →

Age summary

Group	Count	%
Under 18	8,245	29.6%
18 and over	19,607	70.4%
65 and over	2,627	9.4%
Median age	35.1 years

Race & ethnicity

White 83.3%

Hispanic or Latino 5.6%

Two or more races 5.6%

Asian 2.6%

Other race 1.9%

Black or African American 0.9%

American Indian / Alaska Native 0.2%

Group	Count	%
White	24,586	83.3%
Hispanic or Latino	1,665	5.6%
Two or more races	1,647	5.6%
Asian	760	2.6%
Other race	554	1.9%
Black or African American	252	0.9%
American Indian / Alaska Native	53	0.2%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	13.3%	14.5%	32.5%
$50k – $100k	22.9%	24.3%	31.0%
$100k – $200k	44.5%	39.5%	26.9%
Over $200k	19.3%	21.8%	9.6%

Under $10k 1.4%

$10k–$15k 0.3%

$15k–$25k 2.6%

$25k–$35k 1.6%

$35k–$50k 6.6%

$50k–$75k 8.1%

$75k–$100k 9.2%

$100k–$150k 22.9%

$150k–$200k 17.9%

$200k+ 29.2%

Range	% of households
Under $10k	1.4%
$10k–$15k	0.3%
$15k–$25k	2.6%
$25k–$35k	1.6%
$35k–$50k	6.6%
$50k–$75k	8.1%
$75k–$100k	9.2%
$100k–$150k	22.9%
$150k–$200k	17.9%
$200k+	29.2%
Median income	$144,034

Housing

Home values

Under $50k 1.4%

$50k–$100k 0.6%

$100k–$150k 0.1%

$150k–$200k 0.3%

$200k–$300k 0.6%

$300k–$500k 21.3%

$500k–$1M 68.7%

$1M+ 7.0%

Housing overview

Metric	Value
Median home value	$615,200
Median rent / month	$1,933
Owner occupied	81.6%
Renter occupied	18.4%
Vacant	1.5%
Single-family detached	80.7%
Large apartment buildings	3.6%
Mobile homes	0.8%
Median rooms	7.5
Avg household size (owned)	3.02

Year built

Era	%
2020 or later	2.0%
2010–2019	30.7%
2000–2009	44.4%
1990–1999	17.7%
1980–1989	3.2%
1970–1979	0.7%
1960–1969	0.4%
1950–1959	0.5%
1940–1949	0.0%
1939 or earlier	0.2%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	3.3%
2 bedrooms	10.6%
3 bedrooms	37.3%
4 bedrooms	28.1%
5+ bedrooms	20.7%

Vehicles per household

Vehicles	% of households
No vehicle	2.8%
1 vehicle	19.4%
2 vehicles	48.0%
3 or more	29.8%

Heating fuel

Fuel type	%
Utility gas	81.2%
Electricity	16.8%
Propane / LP gas	1.6%
Fuel oil	0.2%
Solar	0.1%

Households & families

Household type	Count	%
Married-couple family	6,157	66.6%
Cohabiting couple	516	5.6%
Male householder, no spouse	1,038	11.2%
Female householder, no spouse	1,538	16.6%
Households with children under 18	4,471	48.3%
Households with seniors (65+)	1,743	18.8%
Average household size	2.97

Marital status

Status	Male	Female
Never married	28.4%	23.4%
Married	61.8%	60.2%
Separated	0.7%	1.9%
Widowed	1.4%	3.9%
Divorced	7.7%	10.5%

Education

Less than 9th grade 0.9%

Some HS, no diploma 0.9%

HS graduate 12.8%

Some college, no degree 21.7%

Associate's degree 5.9%

Bachelor's degree 40.9%

Graduate / professional 17.0%

Metric	%
HS diploma or higher	98.2%
Bachelor's or higher	57.9%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	668	8.1%
Kindergarten	352	4.3%
Elementary school	3,837	46.6%
High school	1,874	22.8%
College / grad school	1,504	18.3%

Employment

Industry of employment

Education & healthcare 18.0%

Professional & management 17.9%

Finance & real estate 10.6%

Arts, food & hospitality 9.7%

Retail trade 8.9%

Public administration 6.7%

Manufacturing 6.5%

Construction 5.6%

Information 5.3%

Other services 3.7%

Wholesale trade 2.8%

Agriculture & mining 2.2%

Transportation & utilities 2.0%

Occupation

Category	%
Management, business & arts	56.3%
Service	15.0%
Sales & office	19.8%
Natural resources & construction	3.3%
Production & transportation	5.7%

Employment type

Type	%
Private sector	83.2%
Government	11.7%
Self-employed	4.3%
Unpaid family workers	0.9%

Commute

Method	%
Drive alone	70.0%
Carpool	4.5%
Public transit	0.7%
Walk	1.3%
Work from home	23.4%
Other means	0.2%
Avg commute (minutes)	30.4

Poverty

All people 2.6%

Under 18 years 2.4%

18 and over 2.6%

Married-couple families 1.2%

Female-led households 1.3%

Income support

Source	% of households
Social Security	17.5%
Retirement income	25.2%
Supplemental Security	1.3%
Cash public assistance	1.1%
Food stamps / SNAP	1.6%

Health indicators

Condition	%
Obesity	21.0%
High blood pressure	20.2%
High cholesterol	27.7%
Diabetes	4.8%
Heart disease	3.1%
Stroke	1.5%
Asthma	9.0%
Arthritis	15.0%
Kidney disease	1.7%
Pulmonary disease	3.4%
Cancer	5.0%

Behavior / access	%
Smoking	11.0%
Binge drinking	21.7%
No physical activity	11.0%
Less than 7 hrs sleep	25.6%
Depression	17.9%
Fair or poor health	6.7%
Poor mental health	12.5%
Poor physical health	6.5%
No health insurance	9.3%
Visited doctor (checkup)	65.9%
Visited dentist	77.1%
Cholesterol screening	91.5%
Teeth loss	6.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,489	7.6%

Disability	%
Any disability	5.9%
Under 18	1.4%
18–64 years	3.9%
65 and over	32.9%

Health insurance coverage

Type	%
Private insurance	84.0%
Public insurance	16.6%
No insurance	5.1%
Uninsured under 19	3.8%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	25,811	92.7%
Spanish	657	2.5%
Other Indo-European	584	2.3%
Asian & Pacific Islander	30	0.1%
Other languages	43	0.2%

Place of birth & citizenship

Origin	Count	%
Native born (US)	26,011	93.4%
Born in same state	25,637	92.0%
Born in different state	10,186	36.6%
Foreign born	374	1.3%
Naturalized citizen	1,841	6.6%
Not a US citizen	832	45.2%

Ancestry

Ancestry	Count	%
French	4,483	16.1%
Italian	2,730	9.8%
Arab	1,142	4.1%
Polish	716	2.6%
English	516	1.9%

Ancestry	Count	%
Dutch	377	1.4%
Irish	126	0.5%
Norwegian	82	0.3%
German	35	0.1%

Technology access

Metric	% of households
Computer access	33.2%
Internet access	96.9%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 80109

What city is ZIP code 80109 in?

ZIP code 80109 is primarily assigned to Castle Rock, Colorado.

What county is ZIP code 80109 in?

ZIP code 80109 falls within Douglas County, Colorado.

How educated is the population of ZIP code 80109?

58% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Is ZIP code 80109 mostly owner-occupied?

82% of occupied units in ZIP code 80109 are owner-occupied, well above the national average.

What is the median household income in ZIP code 80109?

The median household income in ZIP code 80109 is $144,034, above the national median of ~$75,000.

What is the typical home value in ZIP code 80109?

The median home value in ZIP code 80109 is $615,200.

What timezone is ZIP code 80109 in?

ZIP code 80109 observes the MST timezone.