ZIP Codes of Sweet Grass County, MT

Population & People
Population & People
Total Population
3,624
Household Income
Household Income
Median Income
$93,483
Housing
Housing
Total Housing Units
1,945
Business & Economy
Business & Economy
Total Businesses
184
Employment
Employment
Employment Rate
62.54%
Education
Education
Bachelor's Degree+
26.87%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 4 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:4 ZIP Codes (4 Standard, 0 PO Box, 0 Unique) [See All]
Area Code:406
Timezone:Mountain (GMT -07:00)
Local Time:2:12:54 PM
Population:3,624 [See All]
FIPS:30097
Land Area:1,937 sq mi
Water Area:7 sq mi
Coordinates:45.8053, -109.9490
Quick Link:
https://www.zip-codes.com/county/mt-sweet-grass.asp
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Montana's priciest housing
Average median home value: $717,600.
Among Montana's 5 wealthiest counties
#3 statewide, average median income $93,483.
Striking education divide
Bachelor's share spans 13.2% to 62.5% — a 49-point gap.

Standout ZIPs in this County


Most Populous
Big Timber · 3,167 people
87.4% of county total
Highest Income
Big Timber · $78,000 median
0.8× county average
Largest Land Area
Big Timber · 1,021.5 sq mi
Spans the most ground
Fastest Growth
Big Timber · 4.4% (10-yr)
3,034 → 3,167 residents
Most Educated
Big Timber · 25.1% bachelor's+
575 of 2,292 adults 25+

Things worth knowing about Sweet Grass County


3,624 residents live across 4 ZIPs covering 1,937 sq mi, served by 4 distinct USPS-recognized cities.

Population moved from 3,601 to 3,624 from 2014 to 2024 — a +0.6% change. 2 ZIPs gained residents, 2 lost.

The county's wealthiest ZIP 59011 (Big Timber, $78,000 median) and poorest ZIP 59052 (Mc Leod, $60,547) are 35.7 miles apart — a 1.3× income gap across local geography.

Median home values vary 3.4× across this county — from $328,100 in 59011 (Big Timber) to $1,107,100 in 59052 (Mc Leod).

Density varies 35× across the county — from 0 people/sq mi in 59052 (Mc Leod) to 9 in 59033 (Greycliff).

Educational attainment ranges from 13.2% bachelor's+ in 59033 (Greycliff) to 62.5% in 59052 (Mc Leod) — the breadth of educational profiles across the area.

Within Montana, this is the #40 most populous of 56 counties and ranks #3 for median household income .

Weighted by population, the typical household earns about $77,645 across the county — reflecting what a typical resident sees, not a simple ZIP average.

26.9% of adults age 25+ hold a bachelor's degree or higher (705 of 2,624 reporting).

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

Stories about Sweet Grass 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
1,937
square miles
Avg density
1.9
people per sq mi
Population
3,624
across 4 ZIPs
Big Timber
1,021.5 sq mi
3,167 residents
Mc Leod
750.3 sq mi
186 residents
Melville
139.1 sq mi
40 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.

Big Timber

All ZIP Codes in Sweet Grass County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
59011Big TimberStandard3,167$78,0001,021.54.4%
59033GreycliffStandard231$71,63526.5-28.0%
59052Mc LeodStandard186$60,547750.313.4%
59055MelvilleStandard40$163,750139.1-51.2%

Adjacent & Nearby Counties