County · Montana
Petroleum County, Montana
Petroleum County, Montana. Petroleum County had 548 residents in 2025 by the Census Bureau's estimate, up 10.0% since 2020, faster than Montana (+5.6%). It holds 1 place (1 city, village or borough) and 1 census tract. GEOID 30069.
Residents, July 2025 estimate
548
Census Bureau estimate (no margin published)
2020 Census count: 496 · ACS 2020-2024: 447 ±105
Median household income
$60,208
±$16,682 (90% margin)
Montana: $72,509
Median home value
$201,400
±$49,436 (90% margin)
Montana: $375,800
Median gross rent
$800
±$227 (90% margin)
Montana: $1,081
How many people live in Petroleum County, and is it growing?
The 2020 Census counted 496 residents in Petroleum County. The Census Bureau estimates 548 for July 1, 2025, up 10.0% since 2020, faster than Montana (+5.6%). The 2020-2024 American Community Survey puts the population at 447 over 1,656 square miles of land.
| Measure | Petroleum County | Montana | Change since 2015-2019 |
|---|---|---|---|
| Total population | 447±105 | 1,116,875 | no clear change |
| Households | 221±54 | 458,859 | no clear change |
| Average household size | 2.02±0.29 | 2.37 | no clear change |
| Housing units | 311±61 | 528,419 | no clear change |
Petroleum County's population since 2000
From 493 in 2000 to 548 in 2025: up 11.2%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Petroleum County?
Petroleum County holds 1 place: 1 city, village or borough (an incorporated place). The largest is Winnett with 205 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| WinnettGEOID 3081100 | 188 | $49,583 |
|---|
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Petroleum County?
The median resident of Petroleum County is 51.6 years old; 14.8% are under 18 and 28.2% are 65 or older. The largest group is non-Hispanic white residents at 98.9%, then non-Hispanic Asian residents at 0.7%.
| Measure | Petroleum County | Montana | Change since 2015-2019 |
|---|---|---|---|
| Median age | 51.6±6.5 | 40.4 | no clear change |
| Under 18 years | 14.8%±6.1 pts | 21.0% | – |
| 65 years and over | 28.2%±8.7 pts | 20.1% | – |
| Hispanic or Latino (any race) | 0.0%±6.5 pts | 4.6% | – |
| White alone, not Hispanic | 98.9%±1.7 pts | 83.6% | no clear change |
| Black or African American alone, not Hispanic | 0.0%±6.5 pts | 0.4% | – |
| Asian alone, not Hispanic | 0.7%±1.2 pts | 0.8% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.4%±1.1 pts | 5.3% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±6.5 pts | 0.0% | – |
| Two or more races, not Hispanic | 0.0%±6.5 pts | 4.7% | – |
| Some other race alone, not Hispanic | 0.0%±6.5 pts | 0.5% | – |
| Born outside the United States | 0.9%±1.7 pts | 2.3% | – |
| Speak a language other than English at home (age 5+) | 0.0%±6.7 pts | 4.2% | – |
| Civilian veterans (age 18+) | 16.3%±8.3 pts | 9.0% | – |
| With a disability | 6.7%±4.3 pts | 14.5% | – |
| No health insurance coverage | 6.7%±4.8 pts | 8.6% | – |
| High school graduate or higher (age 25+) | 98.9%±1.4 pts | 94.6% | – |
| Bachelor's degree or higher (age 25+) | 30.8%±9.7 pts | 35.2% | no clear change |
| Graduate or professional degree (age 25+) | 10.6%±4.5 pts | 12.0% | – |
| Moved from another state in the past year | 5.5%±5.5 pts | 3.7% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Petroleum County earn?
Half of Petroleum County's 221 households earn less than $60,208 a year (±$16,682), against $72,509 in Montana. In 2015-2019 it was $63,073 in 2024 dollars; the margins of error cannot tell the two periods apart. 8.1% of residents live below the poverty line.
| Measure | Petroleum County | Montana | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $60,208±$16,682 | $72,509 | no clear change |
| Mean household income | $78,436±$16,266 | $98,908 | – |
| Per capita income | $39,919±$8,205 | $41,711 | no clear change |
| People below the poverty line | 8.1%±4.1 pts | 11.5% | no clear change |
| Children under 18 below the poverty line | 3.0%±4.5 pts | 12.7% | – |
| Households receiving SNAP | 0.5%±1.2 pts | 7.8% | – |
| Households with a broadband subscription | 84.2%±8.8 pts | 89.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Petroleum County?
Owners occupy 72.9% of Petroleum County's occupied homes and renters 27.1%. The median owner-occupied home is valued at $201,400 by its owner (±$49,436). The median renter pays $800 a month including utilities.
| Measure | Petroleum County | Montana | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $201,400±$49,436 | $375,800 | no clear change |
| Median gross rent | $800±$227 | $1,081 | no clear change |
| Renters paying 35% or more of income on rent | 0.0%±59.4 pts | 35.5% | – |
| Median monthly owner costs, with a mortgage | $1,635±$257 | $1,798 | – |
| Owner-occupied homes | 72.9%±10.7 pts | 69.2% | no clear change |
| Housing units | 311±61 | 528,419 | no clear change |
| Homeowner vacancy rate | 0.0%±16.9 pts | 0.9% | – |
| Rental vacancy rate | 0.0%±36.0 pts | 5.3% | – |
| Single-family detached homes | 76.5%±8.3 pts | 68.8% | – |
| Mobile homes | 21.2%±7.9 pts | 9.4% | – |
| Built 2020 or later | 1.6%±1.7 pts | 2.3% | – |
| Built 1939 or earlier | 16.7%±8.2 pts | 12.8% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Petroleum County get to work?
49.8% of Petroleum County's workers drive alone. The average trip to work takes 16.2 minutes.
| Measure | Petroleum County | Montana | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 61.7%±8.6 pts | 62.9% | – |
| Unemployment rate | 0.0%±12.0 pts | 3.6% | – |
| Drove alone to work | 49.8%±11.8 pts | 71.1% | – |
| Carpooled | 10.6%±6.6 pts | 9.7% | – |
| Public transportation | 0.0%±12.0 pts | 0.6% | – |
| Walked | 24.3%±11.2 pts | 3.9% | – |
| Worked from home | 15.3%±12.3 pts | 12.5% | – |
| Mean travel time to work | 16.2 min±5.6 | 19.1 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Petroleum County's census tracts?
Petroleum County is a single census tract.
| Tract 130069000100 | 447±105 | $60,208 |
|---|
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Petroleum County compare with Montana's other counties?
| Measure | Rank |
|---|---|
| Population | 56th of 56 |
| Growth 2020-2025 | 11th of 56 |
| Residents per square mile | 55th of 56 |
| Median household income | 35th of 56 |
| Median home value | 39th of 56 |
| Median gross rent | 31st of 56 |
| Poverty rate | 47th of 56 |
| Bachelor's degree or higher | 16th of 56 |
| Median age | 11th of 56 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Petroleum County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.