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Petroleum County, MT
1 city or town and 1 ZIP code in Petroleum County, Montana.
Population
447
Land area
1,656sq mi
People per sq mi
0
ZIP codes
1
Cities and towns in Petroleum County
Petroleum County at a glance
- Petroleum County is 96% less dense than Montana as a whole.
Local data for Petroleum County, MT
Counts from official public data
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
2.6%
Sep 2026, -1.2 pts in a year
Average annual pay
$36,848
104 jobs, 2025
Income per person
$42,202
BEA, 2024
Federal spending
$7.6M
FY 2026, $15,246 per person
PPP loans
$757K
49 loans, 81 jobs reported
Campaign donations
$210
Itemized, 2026 cycle
Environment and hazard risk
Petroleum County, MT, from FEMA, NOAA and EPA
Natural hazard risk
Very Low
Top: lightning
Storm events since 1996
386
Most often hail
Flood insurance policies
1
0.2% of homes, county
July high / Jan low
86° / 6°F
14.6 inches of rain a year
Hazards, floods and storm historyCheck a flood zone2 historic places
Health statistics
Share of adults in Petroleum County, MT, CDC PLACES estimates
Obesity
32.9%
U.S. 33.3% about the same
Diabetes
12.4%
U.S. 12.1% about the same
Smoking
13.9%
U.S. 12.8% +1.1 pts
Uninsured (18-64)
8.5%
U.S. 11.1% -2.6 pts
Cities, towns and ZIP codes in Petroleum County
Population shown
Frequently asked questions
- What is the largest city in Petroleum County, MT?
- Winnett is the largest city or town in Petroleum County, with about 204 residents.
- How many ZIP codes are in Petroleum County?
- Petroleum County includes 1 ZIP Code Tabulation Areas, including 59087.
- What is the population of Petroleum County, MT?
- About 447 people live in Petroleum County, based on American Community Survey 5-year estimates.
- What counties border Petroleum County?
- Petroleum County borders Fergus County, Rosebud County, Musselshell County, Phillips County, Garfield County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023