ZIP Codes of Mills County, IA

Population & People
Population & People
Total Population
14,340
Household Income
Household Income
Median Income
$91,935
Housing
Housing
Total Housing Units
6,028
Business & Economy
Business & Economy
Total Businesses
323
Employment
Employment
Employment Rate
60.53%
Education
Education
Bachelor's Degree+
30.83%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 8 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:8 ZIP Codes (7 Standard, 1 PO Box, 0 Unique) [See All]
Area Code:712
Timezone:Central (GMT -06:00)
Local Time:2:11:54 PM
Population:14,340 [See All]
FIPS:19129
CBSA:Omaha, NE-IA
Land Area:468 sq mi
Water Area:3 sq mi
Coordinates:41.0638, -95.5929
Quick Link:
https://www.zip-codes.com/county/ia-mills.asp
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Iowa's #55 most populous county
14,340 residents across 8 ZIPs — #55 of 99 Iowa counties.

Standout ZIPs in this County


Most Populous
Glenwood · 8,874 people
61.9% of county total
Highest Income
Pacific Junction · $113,421 median
1.2× county average
Largest Land Area
Glenwood · 101.1 sq mi
Spans the most ground
Fastest Growth
Malvern · 5.8% (10-yr)
1,741 → 1,842 residents
Most Educated
Glenwood · 32.8% bachelor's+
2,081 of 6,343 adults 25+

Things worth knowing about Mills County


14,340 residents live across 8 ZIPs covering 468 sq mi, served by 8 distinct USPS-recognized cities.

Population moved from 14,979 to 14,340 from 2014 to 2024 — a -4.3% change. 3 ZIPs gained residents, 5 lost.

The county's wealthiest ZIP 51561 (Pacific Junction, $113,421 median) and poorest ZIP 51533 (Emerson, $68,750) are 22.8 miles apart — a 1.6× income gap across local geography.

Median home values vary 2.9× across this county — from $136,500 in 51533 (Emerson) to $392,300 in 51554 (Mineola).

Density varies 15× across the county — from 6 people/sq mi in 51541 (Henderson) to 88 in 51534 (Glenwood).

Educational attainment ranges from 13.1% bachelor's+ in 51533 (Emerson) to 68.9% in 51554 (Mineola) — the breadth of educational profiles across the area.

Within Iowa, this is the #55 most populous of 99 counties and ranks #6 for median household income .

Weighted by population, the typical household earns about $92,512 across the county — reflecting what a typical resident sees, not a simple ZIP average.

30.8% of adults age 25+ hold a bachelor's degree or higher (3,118 of 10,113 reporting).

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

Stories about Mills County


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.

Glenwood

All ZIP Codes in Mills County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
51534GlenwoodStandard8,874$93,646101.1-6.2%
51551MalvernStandard1,842$85,46983.75.8%
51561Pacific JunctionStandard1,039$113,42157.7-14.3%
51571Silver CityStandard902$95,25044.558.0%
51533EmersonStandard844$68,75077.5-17.7%
51540HastingsStandard372$84,37552.9-23.9%
51541HendersonStandard273$91,87547.7-14.4%
51554MineolaPO Box194$102,6922.823.6%

Adjacent & Nearby Counties