ZIP Codes of Adair County, IA

Population & People
Population & People
Total Population
6,276
Household Income
Household Income
Median Income
$70,468
Housing
Housing
Total Housing Units
3,044
Business & Economy
Business & Economy
Total Businesses
192
Employment
Employment
Employment Rate
65.00%
Education
Education
Bachelor's Degree+
21.04%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 5 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:5 ZIP Codes (5 Standard, 0 PO Box, 0 Unique) [See All]
Area Code:641
Timezone:Central (GMT -06:00)
Local Time:2:11:50 PM
Population:6,276 [See All]
FIPS:19001
Land Area:453 sq mi
Water Area:1 sq mi
Coordinates:41.3122, -94.5192
Quick Link:
https://www.zip-codes.com/county/ia-adair.asp
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Iowa's #94 most populous county
6,276 residents across 5 ZIPs — #94 of 99 Iowa counties.

Standout ZIPs in this County


Most Populous
Greenfield · 2,374 people
37.8% of county total
Highest Income
Adair · $79,071 median
1.1× county average
Largest Land Area
Adair · 113.0 sq mi
Spans the most ground
Fastest Growth
Fontanelle · 10.5% (10-yr)
1,155 → 1,276 residents
Most Educated
Greenfield · 28.4% bachelor's+
466 of 1,641 adults 25+

Things worth knowing about Adair County


6,276 residents live across 5 ZIPs covering 453 sq mi, served by 5 distinct USPS-recognized cities.

Population moved from 6,136 to 6,276 from 2014 to 2024 — a +2.3% change. 3 ZIPs gained residents, 2 lost.

The county's wealthiest ZIP 50002 (Adair, $79,071 median) and poorest ZIP 50837 (Bridgewater, $63,000) are 18.6 miles apart — a 1.3× income gap across local geography.

Median home values vary 2.2× across this county — from $108,800 in 50846 (Fontanelle) to $237,700 in 50002 (Adair).

Density varies across the county — from 6 people/sq mi in 50837 (Bridgewater) to 21 in 50849 (Greenfield).

Educational attainment ranges from 10.9% bachelor's+ in 50858 (Orient) to 28.4% in 50849 (Greenfield) — the breadth of educational profiles across the area.

Within Iowa, this is the #94 most populous of 99 counties and ranks #67 for median household income .

Weighted by population, the typical household earns about $70,911 across the county — reflecting what a typical resident sees, not a simple ZIP average.

21.0% of adults age 25+ hold a bachelor's degree or higher (938 of 4,459 reporting).

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

All ZIP Codes in Adair County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
50849GreenfieldStandard2,374$64,821112.1-9.3%
50002AdairStandard1,496$79,071113.010.4%
50846FontanelleStandard1,276$74,20095.610.5%
50858OrientStandard848$71,25082.318.1%
50837BridgewaterStandard282$63,00050.0-3.4%

Adjacent & Nearby Counties