ZIP Code 80303

80303 is one of Colorado's ZIP codes, delivering to addresses in Boulder, Boulder County.

City: Boulder
County: Boulder County
State: Colorado
Prefix: 803xx

Where this code sits

80303 is part of the 803xx range, the group of codes handled by one mail processing centre. Boulder is served by 11 ZIP codes in total; the full list, with the county each falls in, is on the Boulder page.

Boulder Colorado ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 80303 delivers to without sharing its boundary.

ZIP codes nearest 80303

The ZIP codes whose reference points sit closest to 80303.
ZIP code	Distance	Delivers to
ZIP code 80305	1.0 mi	Boulder, CO
ZIP code 80309	2.3 mi	Boulder, CO
ZIP code 80310	2.3 mi	Boulder, CO
ZIP code 80302	3.0 mi	Boulder, CO
ZIP code 80304	3.8 mi	Boulder, CO
ZIP code 80301	4.2 mi	Boulder, CO
ZIP code 80025	4.8 mi	Eldorado Springs, CO
ZIP code 80027	5.0 mi	Louisville, 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 80303, plotted from its record coordinates.

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

Scope ZIP code 80303. 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.