County ZIP codes · Colorado · FIPS 08035
Douglas County, CO ZIP Codes
Douglas County, Colorado has 19 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 18 residential and 1 for PO boxes or a single organization. 14 of the residential ones lie mainly in Douglas County and 4 mainly in a neighboring county; 6 cross the county line. Median household income ranges from $94,296 in 80120 (Littleton) to $181,049 in 80108 (Castle Rock) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Douglas County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $134,335 and $158,155.
They carry 11 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 18 residential ZIP codes in Douglas County
14 ZIP codes lie mainly in Douglas County; 4 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 80134 | Parker | 80,302 | 1,400 | $147k | $678k | 100% |
| 80126 | Littleton | 44,882 | 4,149 | $170k | $782k | 100% |
| 80104 | Castle Rock | 38,479 | 544 | $134k | $624k | 100% |
| 80138 | Parker | 36,895 | 595 | $145k | $724k | 55% |
| 80108 | Castle Rock | 36,730 | 1,041 | $181k | $882k | 100% |
| 80129 | Littleton | 30,223 | 4,293 | $142k | $664k | 99% |
| 80109 | Castle Rock | 28,400 | 1,093 | $155k | $676k | 100% |
| 80130 | Littleton | 24,719 | 3,595 | $159k | $692k | 100% |
| 80124 | Lone Tree | 22,555 | 2,404 | $130k | $774k | 100% |
| 80125 | Littleton | 15,630 | 399 | $180k | $762k | 100% |
| 80118 | Larkspur | 5,632 | 43 | $158k | $887k | 100% |
| 80116 | Franktown | 5,132 | 56 | $146k | $960k | 100% |
| 80135 | Sedalia | 4,141 | 11 | $136k | $881k | 83% |
| 80131 | Louviers | 276 | 497 | $107k | $428k | 100% |
Partly in Douglas County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
7 ZIP codes of Douglas County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Douglas | Elsewhere |
|---|---|---|
| 80016 | 5% | Arapahoe County 95% |
| 80138 | 55% | Elbert County 45% |
| 80112 | 27% | Arapahoe County 73% |
| 80129 | 99% | |
| 80120 | 1% | Arapahoe County 99% |
| 80106 | 4% | Elbert County 80%; El Paso County 17% |
| 80135 | 83% | Jefferson County 17% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 80163 | Littleton |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Douglas County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Douglas County's ZIP codes use 2 prefixes: 800 and 801.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.