Boyd is a census-designated place and unincorporated community in Carbon County, Montana, United States. As of the 2010 census it had a population of 35. Boyd was a stop on the Northern Pacific Railway en route to Red Lodge. A post office was first established at Boyd on March 12, 1909 with Roland N. Doughty as the town's first postmaster. Since December 3, 1965, the office has operated as a rural station or a CPO of Roberts with the ZIP code of 59013.