MISSION STATEMENT To maintain accessibility, accountability, efficiency and a sense of community, within the various functions of County government, while safeguarding the liberties of our citizens. ''Streamlining Accessibility to Local Government Resources and Services'' Big Horn County Court House121 West Third - Hardin, MontanaWelcome to Big Horn County, the sixth largest county inMontana, at approximately 5,023 square miles, and with a population exceeding 13,000. The local government was established January 13, 1913. Big Horn County celebrates its centennial in 2013.Hardin is the County Seat.Big Horn County is a land made up of varying jurisdictions. As you drive across the Crow and Northern Cheyenne Indian Nations, be aware that each has its own unique regulations and law enforcement agencies. The National Park Service maintains jurisdiction at Little Bighorn Battlefield and the Big Horn Canyon National Recreation Area. The scenic Big Horn, Pryor andWolfMountainranges are part of the Big Horn County landscape. more... See more text