| ZIP Codes: | 15 ZIP Codes (13 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 303 / 720 / 983 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 11:52:50 PM |
| Population: | 373,996 [See All] |
| FIPS: | 08035 |
| CBSA: | Denver-Aurora-Centennial, CO |
| Land Area: | 895 sq mi |
| Water Area: | 4 sq mi |
| Coordinates: | 39.4379, -104.9033 |
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373,996 residents live across 15 ZIPs covering 895 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 301,956 to 373,996 from 2014 to 2024 — a +23.9% change. 13 ZIPs gained residents, 1 lost.
The county's wealthiest ZIP 80108 (Castle Rock, $181,049 median) and poorest ZIP 80124 (Lone Tree, $129,858) are 6.1 miles apart — a 1.4× income gap across local geography.
Median home values vary 1.5× across this county — from $624,200 in 80104 (Castle Rock) to $960,400 in 80116 (Franktown).
Density varies 397× across the county — from 13 people/sq mi in 80135 (Sedalia) to 5,164 in 80130 (Littleton).
Most of the decade's growth concentrated around Castle Rock — top growth ZIPs averaged +50.4% over the past ten years ( 80108 , 80109 and 80125 ).
Educational attainment ranges from 51.1% bachelor's+ in 80138 (Parker) to 69.8% in 80130 (Littleton) — the breadth of educational profiles across the area.
Within Colorado, this is the #6 most populous of 65 counties and ranks #1 for median household income with the #3 fastest decade growth .
On the national stage, Douglas County is ranks #22 for income .
Weighted by population, the typical household earns about $152,846 across the county — reflecting what a typical resident sees, not a simple ZIP average.
61.9% of adults age 25+ hold a bachelor's degree or higher (158,919 of 256,648 reporting). The most-educated ZIPs cluster around Littleton.
13 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.
9 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
Douglas County grew 23.9% over the past decade — concentrated in 5 high-growth ZIPs:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 80134 | Parker | Standard | 80,302 | $146,778 | 52.1 | 37.9% |
| 80126 | Littleton | Standard | 44,882 | $169,882 | 11.7 | 7.7% |
| 80104 | Castle Rock | Standard | 38,479 | $134,335 | 73.0 | 34.7% |
| 80138 | Parker | Standard | 36,895 | $145,013 | 60.9 | 20.2% |
| 80108 | Castle Rock | Standard | 36,730 | $181,049 | 41.1 | 53.4% |
| 80129 | Littleton | Standard | 30,223 | $141,667 | 6.8 | 7.5% |
| 80109 | Castle Rock | Standard | 28,400 | $155,025 | 25.9 | 49.6% |
| 80130 | Littleton | Standard | 24,719 | $158,741 | 4.8 | -14.1% |
| 80124 | Lone Tree | Standard | 22,555 | $129,858 | 11.5 | 17.0% |
| 80125 | Littleton | Standard | 15,630 | $179,983 | 45.5 | 48.3% |
| 80118 | Larkspur | Standard | 5,632 | $158,155 | 152.3 | 4.7% |
| 80116 | Franktown | Standard | 5,132 | $146,000 | 90.5 | 35.1% |
| 80135 | Sedalia | Standard | 4,141 | $136,083 | 318.2 | 7.4% |
| 80131 | Louviers | PO Box | 276 | $107,250 | 0.7 | 91.7% |
| 80163 | Littleton | PO Box | — | — | 0.0 | — |