ZIP Codes of Plymouth County, IA

Population & People
Population & People
Total Population
24,612
Household Income
Household Income
Median Income
$86,411
Housing
Housing
Total Housing Units
10,545
Business & Economy
Business & Economy
Total Businesses
578
Employment
Employment
Employment Rate
67.67%
Education
Education
Bachelor's Degree+
21.57%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 9 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:9 ZIP Codes (7 Standard, 2 PO Box, 0 Unique) [See All]
Area Code:712
Timezone:Central (GMT -06:00)
Local Time:2:11:54 PM
Population:24,612 [See All]
FIPS:19149
CBSA:Le Mars, IA
Land Area:828 sq mi
Water Area:0 sq mi
Coordinates:42.7400, -96.2217
Quick Link:
https://www.zip-codes.com/county/ia-plymouth.asp
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Iowa's #26 most populous county
24,612 residents across 9 ZIPs — #26 of 99 Iowa counties.

Standout ZIPs in this County


Most Populous
Le Mars · 12,808 people
52.0% of county total
Highest Income
Hinton · $114,219 median
1.3× county average
Largest Land Area
Le Mars · 232.3 sq mi
Spans the most ground
Fastest Growth
Hinton · 10.8% (10-yr)
1,878 → 2,081 residents
Most Educated
Kingsley · 29.9% bachelor's+
441 of 1,477 adults 25+

Things worth knowing about Plymouth County


24,612 residents live across 9 ZIPs covering 828 sq mi, served by 9 distinct USPS-recognized cities.

Population moved from 23,753 to 24,546 from 2014 to 2024 — a +3.3% change. 5 ZIPs gained residents, 3 lost.

The county's wealthiest ZIP 51024 (Hinton, $114,219 median) and poorest ZIP 51008 (Brunsville, $45,000) are 13.1 miles apart — a 2.5× income gap across local geography.

Median home values vary 2.7× across this county — from $129,200 in 51008 (Brunsville) to $347,800 in 51024 (Hinton).

Density varies 99× across the county — from 8 people/sq mi in 51062 (Westfield) to 805 in 51008 (Brunsville).

Educational attainment ranges from 15.0% bachelor's+ in 51050 (Remsen) to 29.9% in 51028 (Kingsley) — the breadth of educational profiles across the area.

Within Iowa, this is the #26 most populous of 99 counties and ranks #13 for median household income .

Weighted by population, the typical household earns about $82,758 across the county — reflecting what a typical resident sees, not a simple ZIP average.

21.6% of adults age 25+ hold a bachelor's degree or higher (3,609 of 16,728 reporting).

7 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Plymouth 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
828
square miles
Avg density
29.7
people per sq mi
Population
24,612
across 9 ZIPs
Le Mars
232.3 sq mi
12,808 residents
Remsen
142.0 sq mi
2,962 residents
Kingsley
118.3 sq mi
2,191 residents

All ZIP Codes in Plymouth County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
51031Le MarsStandard12,808$76,525232.35.7%
51050RemsenStandard2,962$92,500142.07.6%
51001AkronStandard2,342$75,40496.7-2.7%
51028KingsleyStandard2,191$78,000118.30.9%
51024HintonStandard2,081$114,21988.610.8%
51038MerrillStandard1,449$95,89387.7-14.5%
51062WestfieldStandard50361.6-20.9%
51008BrunsvillePO Box210$45,0000.3114.3%
51045OyensPO Box66$113,7500.1

Adjacent & Nearby Counties