ZIP Codes of Polk County, MO

Population & People
Population & People
Total Population
32,156
Household Income
Household Income
Median Income
$60,841
Housing
Housing
Total Housing Units
13,585
Business & Economy
Business & Economy
Total Businesses
603
Employment
Employment
Employment Rate
53.16%
Education
Education
Bachelor's Degree+
21.20%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 11 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:11 ZIP Codes (10 Standard, 1 PO Box, 0 Unique) [See All]
Area Code:417
Timezone:Central (GMT -06:00)
Local Time:11:54:03 PM
Population:32,156 [See All]
FIPS:29167
CBSA:Springfield, MO
Land Area:712 sq mi
Water Area:17 sq mi
Coordinates:37.6238, -93.4724
Quick Link:
https://www.zip-codes.com/county/mo-polk.asp
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Missouri's #36 most populous county
32,156 residents across 11 ZIPs — #36 of 116 Missouri counties.

Standout ZIPs in this County


Most Populous
Bolivar · 17,666 people
54.9% of county total
Highest Income
Morrisville · $77,865 median
1.3× county average
Largest Land Area
Bolivar · 189.8 sq mi
Spans the most ground
Fastest Growth
Fair Play · 47.6% (10-yr)
1,309 → 1,932 residents
Most Educated
Bolivar · 29.1% bachelor's+
3,209 of 11,032 adults 25+

Things worth knowing about Polk County


32,156 residents live across 11 ZIPs covering 712 sq mi, served by 10 distinct USPS-recognized cities.

Population moved from 30,702 to 32,156 from 2014 to 2024 — a +4.7% change. 5 ZIPs gained residents, 5 lost.

The county's wealthiest ZIP 65710 (Morrisville, $77,865 median) and poorest ZIP 65649 (Fair Play, $46,516) are 13.3 miles apart — a 1.7× income gap across local geography.

Median home values vary 2.6× across this county — from $120,000 in 65650 (Flemington) to $314,300 in 65649 (Fair Play).

Density varies across the county — from 10 people/sq mi in 65601 (Aldrich) to 93 in 65613 (Bolivar).

Educational attainment ranges from 4.2% bachelor's+ in 65640 (Dunnegan) to 29.1% in 65613 (Bolivar) — the breadth of educational profiles across the area.

Within Missouri, this is the #36 most populous of 116 counties and ranks #60 for median household income .

Weighted by population, the typical household earns about $58,903 across the county — reflecting what a typical resident sees, not a simple ZIP average.

21.2% of adults age 25+ hold a bachelor's degree or higher (4,388 of 20,698 reporting).

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

Stories about Polk 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
712
square miles
Avg density
45.2
people per sq mi
Population
32,156
across 11 ZIPs
Bolivar
189.8 sq mi
17,666 residents
Half Way
107.5 sq mi
2,700 residents
Humansville
98.9 sq mi
2,896 residents

All ZIP Codes in Polk County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
65613BolivarStandard17,666$59,172189.85.2%
65674HumansvilleStandard2,896$47,50098.9-7.7%
65663Half WayStandard2,700$61,023107.5-2.0%
65649Fair PlayStandard1,932$46,51670.047.6%
65617BrightonStandard1,716$76,48831.9-20.8%
65710MorrisvilleStandard1,589$77,86530.99.7%
65640DunneganStandard1,530$61,13641.278.9%
65650FlemingtonStandard1,454$50,19473.824.9%
65601AldrichStandard572$46,87558.0-21.9%
65727PolkStandard101$81,64110.1-69.9%
65645MorrisvillePO Box0.0

Adjacent & Nearby Counties