ZIP Codes of Adair County, MO

Population & People
Population & People
Total Population
25,375
Household Income
Household Income
Median Income
$73,866
Housing
Housing
Total Housing Units
11,412
Business & Economy
Business & Economy
Total Businesses
608
Employment
Employment
Employment Rate
52.23%
Education
Education
Bachelor's Degree+
35.09%
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:660
Timezone:Central (GMT -06:00)
Local Time:2:12:40 PM
Population:25,375 [See All]
FIPS:29001
CBSA:Kirksville, MO
Land Area:507 sq mi
Water Area:2 sq mi
Coordinates:40.2115, -92.5245
Quick Link:
https://www.zip-codes.com/county/mo-adair.asp
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Missouri's youngest county
Median age 29.7.
Missouri's shortest commutes
15-minute avg commute — the shortest in the state.
Striking education divide
Bachelor's share spans 6.4% to 39.4% — a 33-point gap.

Standout ZIPs in this County


Most Populous
Kirksville · 21,218 people
83.6% of county total
Highest Income
Gibbs · $96,250 median
1.3× county average
Largest Land Area
Kirksville · 205.1 sq mi
Spans the most ground
Fastest Growth
Kirksville · -1.4% (10-yr)
21,509 → 21,218 residents
Most Educated
Kirksville · 39.4% bachelor's+
4,520 of 11,460 adults 25+

Things worth knowing about Adair County


25,375 residents live across 5 ZIPs covering 507 sq mi, served by 5 distinct USPS-recognized cities.

Population moved from 25,615 to 25,375 from 2014 to 2024 — a -0.9% change. 2 ZIPs gained residents, 3 lost.

The county's wealthiest ZIP 63540 (Gibbs, $96,250 median) and poorest ZIP 63559 (Novinger, $60,481) are 19.5 miles apart — a 1.6× income gap across local geography.

Median home values vary 2.3× across this county — from $81,700 in 63540 (Gibbs) to $187,500 in 63533 (Brashear).

Density varies across the county — from 11 people/sq mi in 63559 (Novinger) to 103 in 63501 (Kirksville).

Educational attainment ranges from 6.4% bachelor's+ in 63540 (Gibbs) to 39.4% in 63501 (Kirksville) — the breadth of educational profiles across the area.

Within Missouri, this is the #42 most populous of 116 counties and ranks #22 for median household income .

Weighted by population, the typical household earns about $62,761 across the county — reflecting what a typical resident sees, not a simple ZIP average.

35.1% of adults age 25+ hold a bachelor's degree or higher (4,934 of 14,059 reporting).

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

Stories about Adair 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
507
square miles
Avg density
50.0
people per sq mi
Population
25,375
across 5 ZIPs
Kirksville
205.1 sq mi
21,218 residents
Greentop
111.3 sq mi
1,340 residents
Novinger
110.2 sq mi
1,258 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.

Kirksville

All ZIP Codes in Adair County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
63501KirksvilleStandard21,218$60,729205.1-1.4%
63546GreentopStandard1,340$72,404111.3-7.9%
63559NovingerStandard1,258$60,481110.2-23.1%
63533BrashearStandard1,141$79,46464.453.2%
63540GibbsStandard418$96,25016.354.2%

Adjacent & Nearby Counties