ZIP Code 80540

80540 is one of Colorado's ZIP codes, delivering to addresses in Lyons, Boulder County.

City: Lyons
County: Boulder County
State: Colorado
Prefix: 805xx

Where this code sits

80540 is part of the 805xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Lyons.

Lyons Colorado ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 80540 delivers to without sharing its boundary.

ZIP codes nearest 80540

The ZIP codes whose reference points sit closest to 80540.
ZIP code	Distance	Delivers to
ZIP code 80533	6.1 mi	Hygiene, CO
ZIP code 80455	9.0 mi	Jamestown, CO
ZIP code 80306	9.8 mi	Boulder, CO
ZIP code 80503	10 mi	Longmont, CO
ZIP code 80510	10 mi	Allenspark, CO
ZIP code 80307	11 mi	Boulder, CO
ZIP code 80314	11 mi	Boulder, CO
ZIP code 80544	12 mi	Niwot, 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 80540, plotted from its record coordinates.

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

Scope ZIP code 80540. 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.