What is the largest city in Larimer County, CO?

Fort Collins is the largest city or town in Larimer County, with about 170,229 residents.

How many ZIP codes are in Larimer County?

Larimer County includes 18 ZIP Code Tabulation Areas, including 80512, 80513, 80515, 80517, 80521.

What is the population of Larimer County, CO?

About 367,368 people live in Larimer County, based on American Community Survey 5-year estimates.

What counties border Larimer County?

Larimer County borders Weld County, Boulder County, Laramie County, WY, Albany County, WY, Grand County, Jackson County.

Larimer County, CO: Cities, ZIP Codes & Local Data

Population

367,368

Land area

2,596sq mi

People per sq mi

142

ZIP codes

18

Larimer County at a glance

Larimer County is about 2.5 times as dense as Colorado as a whole.
It is the 7th most populous of 64 counties in Colorado.
The median household income is $93,765, close to the Colorado median.
A typical owner-occupied home is valued at $569,100 (6% above Colorado) and median rent is $1,716 a month.
The biggest population centers are Fort Collins (170,229), Loveland (78,410) and Johnstown (18,883).

Local data for Larimer County, CO

Counts from official public data

Housing and community stats

Larimer County, CO, American Community Survey 2020-2024

Full profile

Median household income

$93,765

Poverty rate

11.2%

Median home value

$569,100

Prices +0.3% in a year

Median rent

$1,716/mo

Homeownership

64.0%

Bachelor's or higher

53.0%

Median age

36.8

Average commute

23.4 min

Largest reported origins and ancestries: German Americans (92,770), Irish Americans (46,990), Mexican Americans (33,799).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

4.4%

Aug 2026, +0.6 pts in a year

Average annual pay

$75,913

171,281 jobs, 2025

Income per person

$73,894

BEA, 2024

Federal spending

$2.5B

FY 2026, $6,977 per person

PPP loans

$863M

11,718 loans, 104,809 jobs reported

Campaign donations

$3.8M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Larimer County, CO, workers 16 and older. American Community Survey 5-year estimates

Drove alone66.3%
Carpooled5.6%
Public transit0.7%
Walked2.7%
Bicycle2.3%
Taxi, ride-hailing, motorcycle or other0.9%
Worked from home21.4%

Average one-way commute: 23.4 minutes for people who do not work from home.

Environment and hazard risk

Larimer County, CO, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Moderate

Top: lightning

Storm events since 1996

1,737

Most often hail

Flood insurance policies

794

0.6% of homes, county

July high / Jan low

79° / 21°F

21.2 inches of rain a year

Hazards, floods and storm history Check a flood zone 64 historic places

Health statistics

Share of adults in Larimer County, CO, CDC PLACES estimates

All 40 measures

Obesity

23.5%

U.S. 33.3% -9.8 pts

Diabetes

7.3%

U.S. 12.1% -4.8 pts

Smoking

9.6%

U.S. 12.8% -3.2 pts

Uninsured (18-64)

8.6%

U.S. 11.1% -2.5 pts

Cities, towns and ZIP codes in Larimer County

Population shown

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Frequently asked questions

What is the largest city in Larimer County, CO?: Fort Collins is the largest city or town in Larimer County, with about 170,229 residents.
How many ZIP codes are in Larimer County?: Larimer County includes 18 ZIP Code Tabulation Areas, including 80512, 80513, 80515, 80517, 80521.
What is the population of Larimer County, CO?: About 367,368 people live in Larimer County, based on American Community Survey 5-year estimates.
What counties border Larimer County?: Larimer County borders Weld County, Boulder County, Laramie County, WY, Albany County, WY, Grand County, Jackson County.