Welcome to Petroleum County ...

Time Zone: Petroleum County lies in the Mountain Time Zone (MST/MDT) and observes daylight saving time.

The community of Winnett is the Seat for Petroleum County.

Petroleum County was founded in 1926 and was created by taking area from Fergus County.

From the Census Estimates for 2019, <1> Petroleum had a population of 487 people. This is a decrease of 0.41% since the last Census (which gave a population of 489 people in 2010).

At the time of the 2010 Census, Petroleum represented 0.05% of the total population of Montana.

Websites of Interest ...

• Websites specific to Montana
  • Jump to Cyndi's List
  • Jump to Family Search
  • Jump to Genealogy Trails
  • Website for the Montana Historical Society

• Websites specific to Petroleum County
  • Jump to Cyndi's List
  • Jump to Family Search
  • Jump to Genealogy Trails

• Websites for nearby counties
  • Fergus County
    • Jump to Cyndi's List
    • Jump to Family Search
    • Jump to Genealogy Trails
  • Garfield County
    • Jump to Cyndi's List
    • Jump to Family Search
    • Jump to Genealogy Trails
  • Musselshell County
    • Jump to Cyndi's List
    • Jump to Family Search
    • Jump to Genealogy Trails
  • Phillips County
    • Jump to Cyndi's List
    • Jump to Family Search
    • Jump to Genealogy Trails

• Cemetery Information and Directories
  • Cyndi's List
  • Cemeteries of Montana
  • Cemeteries of Petroleum County
  • FamilySearch.org: Cemeteries of Montana
  • Find-A-Grave: Home Page
  • Interment.net
  • Cemeteries of Montana