Other settlers soon moved into the area, and in 1892, a post office was opened at Lefors with Thut as postmaster. (Postal officials required that the F be lower-cased.) Four years later, a combination school and church building was built. When Gray County was organized on May 27, 1902, Lefors was named the county seat. A two-story frame courthouse was built for less than $2,500, and Thut, who became the first county treasurer, erected a hotel. Perry LeFors served as the town's first constable. The population reached 150 in 1910, and despite its small size and the lack of a railroad, the town managed for a time to remain the county seat.