 In 1838, under the formannskapsdistrikt law, the "prestegjeld" of Røros became a locally governed municipality.Nearly 100 years later, in 1926, the municipality was split up.On 1 January 1926, the town of Røros and its surrounding area, a total of , was established as a separate municipality called "Bergstaden Røros" (the mining town of Røros).