Denton is a town in Fergus County, Montana, United States. The population was 205 at the 2020 census. Central Montana Rail, Inc. is headquartered in Denton. A post office called Denton has been in operation since 1888. It was named after the Missouri county where the postmaster previously lived. The town was established at its present …Denton is a town in Fergus County, Montana, United States. The population was 205 at the 2020 census. Central Montana Rail, Inc. is headquartered in Denton. A post office called Denton has been in operation since 1888. It was named after the Missouri county where the postmaster previously lived. The town was established at its present site when the railroad was extended to that point.