ZIP codes

ZIP codes in Larimer County, Colorado

Larimer County has 23 ZIP codes. 13 lie entirely inside it and 10 are shared with neighboring counties, so part of their land and their people are elsewhere. About 362,262 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 23; 1 more just touches the border (under 1% of their land)
Entirely inside: 13; 99% or more of their land
Shared with other counties: 10; Most with Weld County (7)
Most populated ZIP: 80525; 54,211 people · Fort Collins
Least populated ZIP: 82063; 62 people · Woods Landing-Jelm
Largest ZIP by land: 80512; 480 sq mi · Fort Collins

Map of the ZIP codes in Larimer 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 Larimer County

23 ZIP codes in Larimer County, CO, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
80503	Longmont	35,846	2.1%	≈ 96
80512	Fort Collins	1,903	100%	1,903
80513	Berthoud	18,271	64%	≈ 16,665
80515	—	934	100%	934
80517	Estes Park	9,657	100%	9,657
80521	Fort Collins	38,776	100%	38,776
80524	Fort Collins	40,030	76%	≈ 37,533
80525	Fort Collins	54,211	100%	54,211
80526	Fort Collins	44,326	100%	44,326
80528	Fort Collins	24,960	100%	24,960
80532	—	185	100%	185
80534	Johnstown	20,502	20%	≈ 3,018
80535	Laporte	1,896	100%	1,896
80536	—	2,383	100%	2,383
80537	Loveland	44,425	97%	≈ 44,264
80538	Loveland	50,110	100%	50,110
80540	Allenspark	4,642	35%	≈ 1,842
80545	Red Feather Lakes	937	100%	937
80547	Timnath	8,821	100%	8,821
80549	Wellington	14,325	95%	≈ 14,289
80550	Windsor	46,456	9.3%	≈ 4,975
80612	—	494	15%	≈ 236
82063	Woods Landing-Jelm	62	80%	≈ 56

They also touch the county with under 1% of their land, so they aren’t counted: 80504.

ZIP codes shared with other counties

These 10 ZIP codes have part of their land in another county. The first figure is the share of their land in Larimer County; then, where the rest lies.

80503 (Longmont): 2.1% here; 98% in Boulder County.
80513 (Berthoud): 64% here; 31% in Weld County and 5.3% in Boulder County.
80524 (Fort Collins): 76% here; 24% in Weld County.
80534 (Johnstown): 20% here; 80% in Weld County.
80537 (Loveland): 97% here; 2.7% in Weld County.
80540 (Allenspark): 35% here; 65% in Boulder County.
80549 (Wellington): 95% here; 5.2% in Weld County.
80550 (Windsor): 9.3% here; 91% in Weld County.
80612: 15% here; 85% in Weld County.
82063 (Woods Landing-Jelm): 80% here; 20% in Albany County, WY.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Fort Collins (6), Loveland (2), Allenspark (1), Berthoud (1), Estes Park (1), and Johnstown (1); 13 places in all.

They start with 3 different three-digit prefixes, one per USPS sorting center: 805, 806, and 820.

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.

Spotted a mistake? Let us know