ZIP codes

ZIP codes in Douglas County, Colorado

Douglas County has 18 ZIP codes. 12 lie entirely inside it and 6 are shared with neighboring counties, so part of their land and their people are elsewhere. About 378,226 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 18; With 1% or more of their land inside
Entirely inside: 12; 99% or more of their land
Shared with other counties: 6; Most with Arapahoe County (3)
Most populated ZIP: 80134; 80,302 people · Parker
Least populated ZIP: 80131; 276 people · Louviers
Largest ZIP by land: 80135; 372 sq mi · Roxborough Park

Map of the ZIP codes in Douglas County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Douglas County

18 ZIP codes in Douglas County, CO, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
80016	Aurora	68,268	4.6%	≈ 1,218
80104	Castle Rock	38,479	100%	38,479
80106	Black Forest	4,455	3.6%	≈ 98
80108	Castle Pines	36,730	100%	36,730
80109	Castle Rock	28,400	100%	28,400
80112	Centennial	36,816	27%	≈ 5,852
80116	Franktown	5,132	100%	5,132
80118	Perry Park	5,632	100%	5,632
80120	Littleton	29,725	1.1%	≈ 114
80124	Lone Tree	22,555	100%	22,555
80125	Roxborough Park	15,630	99.7%	≈ 15,625
80126	Highlands Ranch	44,882	100%	44,882
80129	Highlands Ranch	30,223	99.4%	≈ 30,144
80130	Highlands Ranch	24,719	100%	24,719
80131	Louviers	276	100%	276
80134	Parker	80,302	100%	80,302
80135	Roxborough Park	4,141	83%	≈ 3,846
80138	Parker	36,895	55%	≈ 34,222

ZIP codes shared with other counties

These 6 ZIP codes have part of their land in another county. The first figure is the share of their land in Douglas County; then, where the rest lies.

80016 (Aurora): 4.6% here; 95% in Arapahoe County.
80106 (Black Forest): 3.6% here; 80% in Elbert County and 17% in El Paso County.
80112 (Centennial): 27% here; 73% in Arapahoe County.
80120 (Littleton): 1.1% here; 99% in Arapahoe County.
80135 (Roxborough Park): 83% here; 17% in Jefferson County.
80138 (Parker): 55% here; 45% in Elbert County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Highlands Ranch (3), Castle Rock (2), Parker (2), Roxborough Park (2), Aurora (1), and Black Forest (1); 13 places in all.

They start with 2 different three-digit prefixes, one per USPS sorting center: 800 and 801.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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