Residential delivery area · Colorado
ZIP Code 80109: Castle Rock, CO
ZIP code 80109 uses the postal name Castle Rock, Colorado and lies entirely in Douglas County (Census 2020 ZIP-county file). About 28,000 people live there (Census Bureau, ACS 2020-2024), the least populous of Castle Rock's 3 residential ZIP codes. Median household income is $155,025 (Census Bureau, ACS 2020-2024). By Census place, 49% of its land lies in Castle Rock; 51% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Castle Rock · 3 residential ZIPs
- County
- Douglas County
- Census places
- Castle Rock
- Metro area
- Denver-Aurora-Centennial, CO
- House district
- CO-4 119th Congress
- State
- Colorado
- Time zone
- Mountain
- Land area
- 26.0 sq mi · 1,093 people per sq mi
Where is ZIP code 80109?
80109 centers on 39.372°, -104.912° and covers 26.0 square miles of land plus 0.0 of water. It borders 4 ZIP codes: 80108, 80104, 80118, 80135.
The map draws ZIP code areas only. For the streets inside 80109, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 80109 compare with the rest of Castle Rock?
| Measure | 80109 | In Castle Rock | In Douglas County | In CO |
|---|---|---|---|---|
| People (ACS 2020-2024) | 28,400 | 3rd of 3 | 10th of 18 | 87th of 527 |
| Median household income | $155k | 2nd of 3 | 6th of 16 | 14th of 277 |
| Median home value | $676k | 2nd of 3 | 13th of 17 | 72nd of 311 |
Its median household income is higher than in 97% of U.S. residential ZIP codes, and it is denser than 79% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 80109?
The 2020 Census counted 27,148 people in 80109; the ACS, which samples households over 2020-2024, estimates 28,400. Between the 2010 and 2020 censuses its population grew 57.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 28,400
- 2020 Census count
- 27,148+57.7% since 2010 (17,219)
- Households
- 9,728
- Median age
- 36.9
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 80109?
Of the 28,400 people the ACS estimates in 80109, 27.3% are under 18 and 9.9% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (78.9%), then Hispanic or Latino (11.1%).
- Under 1827.3%
- 18 to 6462.8%
- 65 and older9.9%
- White, not Hispanic78.9%
- Hispanic or Latino11.1%
- Other or two or more6.6%
- Asian, not Hispanic2.4%
- Black, not Hispanic1.0%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 80109 earn?
Median household income is $155,025 (ACS 2020-2024), the 6th highest of the 16 ranked ZIP codes in Douglas County. It is not measurably different from 2015-2019 ($153,885 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $155,025
- Income per person
- $62,169
- Below the poverty line
- 3.3%
- Unemployed (of the labor force)
- 6.2%
- Adults 25+ with a bachelor's degree
- 57.8%
- Adjusted gross income per tax return, 2022
- $133,75713,010 returns; wages 72% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 80109?
FHFA's house price index for 80109, built from repeat sales and appraisals of the same homes, rose 79% from 2015 to 2025 and rose 35% from 2020 to 2025, and moved −2.7% in 2025.
- Median home value (owners' estimate)
- $675,500
- Median gross rent
- $2,304
- Homes owned by their occupants
- 81.4%
- Housing units
- 9,873
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 80109?
644 business establishments had a location in this ZIP code in 2023, 109 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services113
- Health care and social assistance84
- Construction83
- Other services (except public administration)69
- Real estate and rental and leasing54
- Retail trade43
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 80109?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 80108 | Castle Rock | 36,730 | $181k | 5.9 mi |
| 80104 | Castle Rock | 38,479 | $134k | 6.9 mi |
| 80118 | Larkspur | 5,632 | $158k | 12.7 mi |
| 80135 | Sedalia | 4,141 | $136k | 15.4 mi |
| 80131 | Louviers | 276 | $107k | 8.9 mi (near) |
| 80134 | Parker | 80,302 | $147k | 10.4 mi (near) |
| 80130 | Littleton | 24,719 | $159k | 10.8 mi (near) |
| 80124 | Lone Tree | 22,555 | $130k | 11.1 mi (near) |
| 80125 | Littleton | 15,630 | $180k | 11.2 mi (near) |
| 80116 | Franktown | 5,132 | $146k | 11.4 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.