Greybull is a town in central Big Horn County, Wyoming, United States. The population was 1,651 at the 2020 census. Greybull is located at 44°29′29″N 108°3′13″W / 44.49139°N 108.05361°W. According to the United States Census Bureau, the town has a total area of 1.83 square miles, of which 1.82 square miles is land and 0.01 square miles is wa…Greybull is a town in central Big Horn County, Wyoming, United States. The population was 1,651 at the 2020 census. Greybull is located at 44°29′29″N 108°3′13″W / 44.49139°N 108.05361°W. According to the United States Census Bureau, the town has a total area of 1.83 square miles, of which 1.82 square miles is land and 0.01 square miles is water.