What is the largest city in Linn County, IA?

Cedar Rapids is the largest city or town in Linn County, with about 137,264 residents.

How many ZIP codes are in Linn County?

Linn County includes 22 ZIP Code Tabulation Areas, including 52202, 52213, 52214, 52219, 52227.

What is the population of Linn County, IA?

About 230,004 people live in Linn County, based on American Community Survey 5-year estimates.

What counties border Linn County?

Linn County borders Johnson County, Benton County, Jones County, Buchanan County, Cedar County, Delaware County, Iowa County.

Linn County, IA: Cities, ZIP Codes & Local Data

Population

230,004

Land area

717sq mi

People per sq mi

321

ZIP codes

22

Linn County at a glance

Linn County is about 5.6 times as dense as Iowa as a whole.
It is the 2nd most populous of 99 counties in Iowa.
Households here earn a median of $77,649 a year, 3% more than the Iowa figure of $75,059.
A typical owner-occupied home is valued at $214,300 (3% above Iowa) and median rent is $945 a month.
The biggest population centers are Cedar Rapids (137,264), Marion (41,896) and Hiawatha (7,206).

Local data for Linn County, IA

Counts from official public data

Housing and community stats

Linn County, IA, American Community Survey 2020-2024

Full profile

Median household income

$77,649

Poverty rate

9.4%

Median home value

$214,300

Prices +3.0% in a year

Median rent

$945/mo

Homeownership

73.5%

Bachelor's or higher

34.7%

Median age

39.0

Average commute

19.3 min

Largest reported origins and ancestries: German Americans (69,592), Irish Americans (32,213), Norwegian Americans (9,354).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

3.5%

Sep 2026, 0.0 pts in a year

Average annual pay

$70,464

125,508 jobs, 2025

Income per person

$66,525

BEA, 2024

Federal spending

$2.4B

FY 2026, $10,633 per person

PPP loans

$653M

7,482 loans, 66,594 jobs reported

Campaign donations

$2.2M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Linn County, IA, workers 16 and older. American Community Survey 5-year estimates

Drove alone75.6%
Carpooled6.3%
Public transit0.6%
Walked1.8%
Bicycle0.2%
Taxi, ride-hailing, motorcycle or other0.8%
Worked from home14.7%

Average one-way commute: 19.3 minutes for people who do not work from home.

Environment and hazard risk

Linn County, IA, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Moderate

Top: strong wind

Storm events since 1996

1,284

Most often thunderstorm wind

Flood insurance policies

655

0.7% of homes, county

July high / Jan low

86° / 13°F

38.8 inches of rain a year

Hazards, floods and storm history Check a flood zone 67 historic places

Health statistics

Share of adults in Linn County, IA, CDC PLACES estimates

All 40 measures

Obesity

35.4%

U.S. 33.3% +2.1 pts

Diabetes

11.2%

U.S. 12.1% -0.9 pts

Smoking

13.5%

U.S. 12.8% +0.7 pts

Uninsured (18-64)

6.4%

U.S. 11.1% -4.7 pts

Cities, towns and ZIP codes in Linn County

Population shown

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Frequently asked questions

What is the largest city in Linn County, IA?: Cedar Rapids is the largest city or town in Linn County, with about 137,264 residents.
How many ZIP codes are in Linn County?: Linn County includes 22 ZIP Code Tabulation Areas, including 52202, 52213, 52214, 52219, 52227.
What is the population of Linn County, IA?: About 230,004 people live in Linn County, based on American Community Survey 5-year estimates.
What counties border Linn County?: Linn County borders Johnson County, Benton County, Jones County, Buchanan County, Cedar County, Delaware County, Iowa County.