ZIP Code 80109

80109 is one of Colorado's ZIP codes, delivering to addresses in Castle Rock, Douglas County.

City: Castle Rock
County: Douglas County
State: Colorado
Prefix: 801xx

Where this code sits

80109 is part of the 801xx range, the group of codes handled by one mail processing centre. Castle Rock is served by 3 ZIP codes in total; the full list, with the county each falls in, is on the Castle Rock page.

Castle Rock Colorado ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 80109 delivers to without sharing its boundary.

ZIP codes nearest 80109

The ZIP codes whose reference points sit closest to 80109.
ZIP code	Distance	Delivers to
ZIP code 80104	2.5 mi	Castle Rock, CO
ZIP code 80163	5.1 mi	Littleton, CO
ZIP code 80108	6.2 mi	Castle Rock, CO
ZIP code 80134	9.2 mi	Parker, CO
ZIP code 80116	9.4 mi	Franktown, CO
ZIP code 80131	9.6 mi	Louviers, CO
ZIP code 80135	9.6 mi	Sedalia, CO
ZIP code 80118	12 mi	Larkspur, CO

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 80109, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 80109. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.