The value of all ranches, farms, hunting land and other rural land and acreage for sale in Petroleum County, Montana, recently was $7 million, representing a total of 2,561 acres of land for sale in Petroleum County. Petroleum County ranks 52nd out of 56 counties in the Treasure State for the total acreage of land currently advertised for sale. Of all locations in Petroleum County with farms and ranches for sale, Winnett featured the most land for sale. Its economy is defined as agricultural, with 100 farms recorded in the county during the most recent U.S. Census. Farming activities in Petroleum County generate annual revenues of $2 million, the majority of which comes from livestock products. Petroleum County is Montana's 42nd biggest county (1,674 square miles). It's located in the North Central Montana region of the state.