ZIP Codes of Winnebago County, IA

Population & People
Population & People
Total Population
11,847
Household Income
Household Income
Median Income
$61,341
Housing
Housing
Total Housing Units
5,745
Business & Economy
Business & Economy
Total Businesses
330
Employment
Employment
Employment Rate
62.91%
Education
Education
Bachelor's Degree+
25.03%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 7 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:7 ZIP Codes (6 Standard, 1 PO Box, 0 Unique) [See All]
Area Code:641
Timezone:Central (GMT -06:00)
Local Time:2:11:55 PM
Population:11,847 [See All]
FIPS:19189
Land Area:525 sq mi
Water Area:3 sq mi
Coordinates:43.3948, -93.7353
Quick Link:
https://www.zip-codes.com/county/ia-winnebago.asp
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Iowa's #64 most populous county
11,847 residents across 7 ZIPs — #64 of 99 Iowa counties.

Standout ZIPs in this County


Most Populous
Forest City · 5,771 people
48.7% of county total
Highest Income
Leland · $77,868 median
1.3× county average
Largest Land Area
Buffalo Center · 148.4 sq mi
Spans the most ground
Fastest Growth
Lake Mills · 20.1% (10-yr)
2,458 → 2,952 residents
Most Educated
Forest City · 27.7% bachelor's+
1,037 of 3,737 adults 25+

Things worth knowing about Winnebago County


11,847 residents live across 7 ZIPs covering 525 sq mi, served by 7 distinct USPS-recognized cities.

Population moved from 12,077 to 11,847 from 2014 to 2024 — a -1.9% change. 2 ZIPs gained residents, 5 lost.

The county's wealthiest ZIP 50453 (Leland, $77,868 median) and poorest ZIP 50465 (Rake, $42,386) are 15.3 miles apart — a 1.8× income gap across local geography.

Median home values vary 3.4× across this county — from $49,000 in 50465 (Rake) to $167,900 in 50436 (Forest City).

Density varies across the county — from 7 people/sq mi in 50473 (Scarville) to 53 in 50465 (Rake).

Educational attainment ranges from 13.3% bachelor's+ in 50453 (Leland) to 35.0% in 50478 (Thompson) — the breadth of educational profiles across the area.

Within Iowa, this is the #64 most populous of 99 counties and ranks #93 for median household income .

Weighted by population, the typical household earns about $70,832 across the county — reflecting what a typical resident sees, not a simple ZIP average.

25.0% of adults age 25+ hold a bachelor's degree or higher (2,068 of 8,262 reporting).

6 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Winnebago County


Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
525
square miles
Avg density
22.6
people per sq mi
Population
11,847
across 7 ZIPs
Buffalo Center
148.4 sq mi
1,441 residents
Forest City
134.2 sq mi
5,771 residents
Lake Mills
86.7 sq mi
2,952 residents

All ZIP Codes in Winnebago County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
50436Forest CityStandard5,771$74,940134.2-4.4%
50450Lake MillsStandard2,952$76,12586.720.1%
50424Buffalo CenterStandard1,441$59,091148.45.6%
50478ThompsonStandard737$48,75076.5-18.9%
50453LelandStandard537$77,86843.4-23.7%
50473ScarvilleStandard219$50,22732.5-22.6%
50465RakePO Box190$42,3863.6-41.0%

Adjacent & Nearby Counties