ZIP Codes of Hamilton County, IA

Population & People
Population & People
Total Population
14,564
Household Income
Household Income
Median Income
$73,931
Housing
Housing
Total Housing Units
7,036
Business & Economy
Business & Economy
Total Businesses
359
Employment
Employment
Employment Rate
62.29%
Education
Education
Bachelor's Degree+
22.37%
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 (8 Standard, 1 PO Box, 0 Unique) [See All]
Area Code:515
Timezone:Central (GMT -06:00)
Local Time:2:11:52 PM
Population:14,564 [See All]
FIPS:19079
Land Area:534 sq mi
Water Area:2 sq mi
Coordinates:42.3694, -93.6943
Quick Link:
https://www.zip-codes.com/county/ia-hamilton.asp
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Iowa's #54 most populous county
14,564 residents across 9 ZIPs — #54 of 99 Iowa counties.

Standout ZIPs in this County


Most Populous
Webster City · 8,885 people
61.0% of county total
Highest Income
Kamrar · $83,056 median
1.1× county average
Largest Land Area
Webster City · 145.5 sq mi
Spans the most ground
Fastest Growth
Stratford · 10.6% (10-yr)
1,186 → 1,312 residents
Most Educated
Jewell · 27.3% bachelor's+
301 of 1,101 adults 25+

Things worth knowing about Hamilton County


14,564 residents live across 9 ZIPs covering 534 sq mi, served by 9 distinct USPS-recognized cities.

Population moved from 14,990 to 14,564 from 2014 to 2024 — a -2.8% change. 2 ZIPs gained residents, 7 lost.

The county's wealthiest ZIP 50132 (Kamrar, $83,056 median) and poorest ZIP 50249 (Stratford, $60,761) are 12.6 miles apart — a 1.4× income gap across local geography.

Median home values vary 1.6× across this county — from $109,600 in 50034 (Blairsburg) to $171,600 in 50132 (Kamrar).

Density varies 16× across the county — from 5 people/sq mi in 50034 (Blairsburg) to 86 in 50231 (Randall).

Educational attainment ranges from 15.2% bachelor's+ in 50231 (Randall) to 28.8% in 50034 (Blairsburg) — the breadth of educational profiles across the area.

Within Iowa, this is the #54 most populous of 99 counties and ranks #47 for median household income .

Weighted by population, the typical household earns about $70,834 across the county — reflecting what a typical resident sees, not a simple ZIP average.

22.4% of adults age 25+ hold a bachelor's degree or higher (2,272 of 10,158 reporting).

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

Stories about Hamilton 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
534
square miles
Avg density
27.3
people per sq mi
Population
14,564
across 9 ZIPs
Webster City
145.5 sq mi
8,885 residents
Stratford
76.9 sq mi
1,312 residents
Williams
67.0 sq mi
581 residents

Single-ZIP anchor

One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.

Webster City

All ZIP Codes in Hamilton County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
50595Webster CityStandard8,885$69,167145.5-2.6%
50130JewellStandard1,468$78,59466.3-8.6%
50249StratfordStandard1,312$60,76176.910.6%
50075EllsworthStandard807$81,25043.7-4.5%
50246StanhopeStandard614$61,32442.0-10.0%
50271WilliamsStandard581$82,65667.0-17.8%
50132KamrarStandard427$83,05630.824.9%
50034BlairsburgStandard328$76,25060.2-7.3%
50231RandallPO Box142$72,3211.6-2.7%

Adjacent & Nearby Counties