ZIP Codes of Fremont County, IA

Population & People
Population & People
Total Population
6,859
Household Income
Household Income
Median Income
$86,538
Housing
Housing
Total Housing Units
3,141
Business & Economy
Business & Economy
Total Businesses
141
Employment
Employment
Employment Rate
58.17%
Education
Education
Bachelor's Degree+
23.16%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 9 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:9 ZIP Codes (9 Standard, 0 PO Box, 0 Unique) [See All]
Area Code:712
Timezone:Central (GMT -06:00)
Local Time:11:53:10 PM
Population:6,859 [See All]
FIPS:19071
Land Area:500 sq mi
Water Area:5 sq mi
Coordinates:40.7728, -95.6092
Quick Link:
https://www.zip-codes.com/county/ia-fremont.asp
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Sharp income gradient
Wealthiest ZIP earns 4.4× the poorest — $217,898 vs $49,063.
Striking education divide
Bachelor's share spans 13.0% to 51.2% — a 38-point gap.

Standout ZIPs in this County


Most Populous
Sidney · 1,569 people
22.9% of county total
Highest Income
Imogene · $217,898 median
2.5× county average
Largest Land Area
Hamburg · 90.9 sq mi
Spans the most ground
Fastest Growth
Sidney · -4.3% (10-yr)
1,639 → 1,569 residents
Most Educated
Sidney · 19.0% bachelor's+
209 of 1,098 adults 25+

Things worth knowing about Fremont County


6,859 residents live across 9 ZIPs covering 500 sq mi, served by 9 distinct USPS-recognized cities.

Population moved from 7,258 to 6,859 from 2014 to 2024 — a -5.5% change. 4 ZIPs gained residents, 5 lost.

The county's wealthiest ZIP 51645 (Imogene, $217,898 median) and poorest ZIP 51650 (Riverton, $49,063) are 16.1 miles apart — a 4.4× income gap across local geography.

Median home values vary 4.3× across this county — from $54,200 in 51650 (Riverton) to $231,800 in 51654 (Thurman).

Density varies across the county — from 5 people/sq mi in 51648 (Percival) to 39 in 51653 (Tabor).

Educational attainment ranges from 13.0% bachelor's+ in 51650 (Riverton) to 51.2% in 51645 (Imogene) — the breadth of educational profiles across the area.

Within Iowa, this is the #91 most populous of 99 counties and ranks #12 for median household income .

Weighted by population, the typical household earns about $82,526 across the county — reflecting what a typical resident sees, not a simple ZIP average.

23.2% of adults age 25+ hold a bachelor's degree or higher (1,115 of 4,814 reporting).

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

Stories about Fremont County


Two counties in one

Median household income spans 4.4× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.

Wealthiest ZIP
Imogene
Median income: $217,898
Population: 419
Bachelor's+: 51.2%
vs
Poorest ZIP (pop >= 500)
Riverton
Median income: $49,063
Population: 197
Bachelor's+: 13.0%
For every $1 of household income in 51650, the typical household in 51645 earns $4.44.

Population decline

Fremont County lost 5.5% of residents between 2014 and 2024. ZIPs that shed the largest share:

Thurman
-38.9%
532 → 325 residents
Hamburg
-11.6%
1,562 → 1,381 residents

All ZIP Codes in Fremont County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
51652SidneyStandard1,569$82,20078.7-4.3%
51653TaborStandard1,446$71,31936.6-4.7%
51640HamburgStandard1,381$65,38590.9-11.6%
51639FarragutStandard919$84,68867.28.1%
51645ImogeneStandard419$217,89844.738.3%
51649RandolphStandard346$58,33341.216.9%
51654ThurmanStandard325$90,18850.5-38.9%
51648PercivalStandard257$59,76655.687.6%
51650RivertonStandard197$49,06334.3-53.2%

Adjacent & Nearby Counties