ZIP Codes of Prairie County, MT

Population & People
Population & People
Total Population
1,258
Household Income
Household Income
Median Income
$63,000
Housing
Housing
Total Housing Units
689
Business & Economy
Business & Economy
Total Businesses
34
Employment
Employment
Employment Rate
52.30%
Education
Education
Bachelor's Degree+
26.27%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 3 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:3 ZIP Codes (3 Standard, 0 PO Box, 0 Unique) [See All]
Area Code:406
Timezone:Mountain (GMT -07:00)
Local Time:2:12:54 PM
Population:1,258 [See All]
FIPS:30079
Land Area:1,662 sq mi
Water Area:9 sq mi
Coordinates:46.7329, -105.1090
Quick Link:
https://www.zip-codes.com/county/mt-prairie.asp
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Among America's 25 oldest counties
Median age 60.0 — #11 nationwide.

Standout ZIPs in this County


Most Populous
Terry · 1,025 people
81.5% of county total
Highest Income
Terry · $63,000 median
1.0× county average
Largest Land Area
Terry · 1,263.6 sq mi
Spans the most ground
Fastest Growth
— growth not calculable
Most Educated
— no education data

Things worth knowing about Prairie County


1,258 residents live across 3 ZIPs covering 1,662 sq mi, served by 3 distinct USPS-recognized cities.

Population moved from 1,297 to 1,258 from 2014 to 2024 — a -3.0% change. 1 ZIPs gained residents, 1 lost.

The county's wealthiest ZIP 59349 (Terry, $63,000 median) and poorest ZIP 59349 (Terry, $63,000) are 0.0 miles apart — a 1.0× income gap across local geography.

Median home values vary 1.4× across this county — from $158,100 in 59349 (Terry) to $220,100 in 59326 (Fallon).

Density varies across the county — from 1 people/sq mi in 59326 (Fallon) to 1 in 59349 (Terry).

Educational attainment ranges from 19.6% bachelor's+ in 59326 (Fallon) to 27.8% in 59349 (Terry) — the breadth of educational profiles across the area.

Within Montana, this is the #50 most populous of 56 counties and ranks #35 for median household income .

Weighted by population, the typical household earns about $63,000 across the county — reflecting what a typical resident sees, not a simple ZIP average.

26.3% of adults age 25+ hold a bachelor's degree or higher (263 of 1,001 reporting).

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

Stories about Prairie 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
1,662
square miles
Avg density
0.8
people per sq mi
Population
1,258
across 3 ZIPs
Terry
1,263.6 sq mi
1,025 residents
Fallon
344.4 sq mi
233 residents
Mildred
53.6 sq mi
no 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.

Terry

All ZIP Codes in Prairie County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
59349TerryStandard1,025$63,0001,263.64.8%
59326FallonStandard233344.4-27.0%
59341MildredStandard53.6

Adjacent & Nearby Counties