Petroleum County, Montana
|Petroleum County, Montana|
Petroleum County Courthouse in Winnett, MT
Location in the state of Montana
Montana's location in the U.S.
1,674 sq mi (4,336 km²)
1,654 sq mi (4,284 km²)
20 sq mi (52 km²), 1.20%
0/sq mi (0.114/km²)
Petroleum County is a county located in the U.S. state of Montana. In 2010, the population was 494, making it Montana's least populous county and the 7th least populous in the United States. Its county seat is Winnett. It was created in 1926 and is the newest of Montana's 56 counties.
According to the U.S. Census Bureau, the county has a total area of 1,674 square miles (4,340 km2), of which 1,654 square miles (4,280 km2) is land and 20 square miles (52 km2) (1.20%) is water.
Major highways 
Adjacent counties 
- Phillips County, Montana - north
- Garfield County, Montana - east
- Rosebud County, Montana - southeast
- Musselshell County, Montana - south
- Fergus County, Montana - west
|Fergus County||Garfield County|
|Musselshell County||Rosebud County|
National protected areas 
At the 2000 census, there were 493 people, 211 households and 136 families residing in the county. The population density was 0.29 per square mile (0.11/km²). There were 292 housing units at an average density of 0.17 per square mile (0.07/km²). The racial makeup of the county was 99.19% White, 0.20% Native American, 0.20% from other races, and 0.41% from two or more races. 1.22% of the population were Hispanic or Latino of any race. 37.0% were of German,14.3% American, 13.2% Norwegian and 10.9% English ancestry according to Census 2000.
There were 211 households of which 31.30% had children under the age of 18 living with them, 55.90% were married couples living together, 5.70% had a female householder with no husband present, and 35.10% were non-families. 31.30% of all households were made up of individuals and 17.50% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.95.
26.00% of the population were under the age of 18, 6.10% from 18 to 24, 22.70% from 25 to 44, 28.20% from 45 to 64, and 17.00% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 110.70 males. For every 100 females age 18 and over, there were 111.00 males.
The median household income was $24,107 and the median family income family was $32,667. Males had a median income of $20,694 versus $17,188 for females. The per capita income for the county was $15,986. About 21.00% of families and 23.20% of the population were below the poverty line, including 25.60% of those under age 18 and 17.30% of those age 65 or over.
Unincorporated communities 
See also 
- List of cemeteries in Petroleum County, Montana
- List of lakes in Petroleum County, Montana
- List of mountains in Petroleum County, Montana
- National Register of Historic Places listings in Petroleum County, Montana