ZIP Codes of Granite County, MT

Population & People
Population & People
Total Population
3,095
Household Income
Household Income
Median Income
$57,250
Housing
Housing
Total Housing Units
1,853
Business & Economy
Business & Economy
Total Businesses
117
Employment
Employment
Employment Rate
51.65%
Education
Education
Bachelor's Degree+
33.39%
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:2:12:53 PM
Population:3,095 [See All]
FIPS:30039
Land Area:1,404 sq mi
Water Area:2 sq mi
Coordinates:46.5232, -113.3454
Quick Link:
https://www.zip-codes.com/county/mt-granite.asp
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Among Montana's 5 oldest counties
Median age 53.5.

Standout ZIPs in this County


Most Populous
Philipsburg · 1,494 people
48.3% of county total
Highest Income
Drummond · $64,261 median
1.1× county average
Largest Land Area
Philipsburg · 906.8 sq mi
Spans the most ground
Fastest Growth
Philipsburg · 15.7% (10-yr)
1,291 → 1,494 residents
Most Educated
Philipsburg · 45.5% bachelor's+
545 of 1,198 adults 25+

Things worth knowing about Granite County


3,095 residents live across 3 ZIPs covering 1,404 sq mi, served by 3 distinct USPS-recognized cities.

Population moved from 2,678 to 3,095 from 2014 to 2024 — a +15.6% change. 2 ZIPs gained residents, 1 lost.

The county's wealthiest ZIP 59832 (Drummond, $64,261 median) and poorest ZIP 59837 (Hall, $50,769) are 12.6 miles apart — a 1.3× income gap across local geography.

Median home values vary 1.2× across this county — from $320,400 in 59832 (Drummond) to $380,000 in 59858 (Philipsburg).

Density varies across the county — from 2 people/sq mi in 59858 (Philipsburg) to 4 in 59832 (Drummond).

Educational attainment ranges from 16.1% bachelor's+ in 59837 (Hall) to 45.5% in 59858 (Philipsburg) — the breadth of educational profiles across the area.

Within Montana, this is the #41 most populous of 56 counties and ranks #46 for median household income with the #9 fastest decade growth .

Weighted by population, the typical household earns about $57,835 across the county — reflecting what a typical resident sees, not a simple ZIP average.

33.4% of adults age 25+ hold a bachelor's degree or higher (799 of 2,393 reporting).

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

Stories about Granite 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
1,404
square miles
Avg density
2.2
people per sq mi
Population
3,095
across 3 ZIPs
Philipsburg
906.8 sq mi
1,494 residents
Drummond
274.1 sq mi
962 residents
Hall
223.5 sq mi
639 residents

All ZIP Codes in Granite County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
59858PhilipsburgStandard1,494$56,719906.815.7%
59832DrummondStandard962$64,261274.1-1.8%
59837HallStandard639$50,769223.557.0%

Adjacent & Nearby Counties