Lyman is a village in Scotts Bluff County, Nebraska, United States. It is part of the Scottsbluff, Nebraska Micropolitan Statistical Area. The population was 341 at the 2010 census. Lyman, less than a mile from the Wyoming border, is sited south of Horse Creek, a tributary of the North Platte River in western Nebraska. Due to its semi-arid climate, the ar…Lyman is a village in Scotts Bluff County, Nebraska, United States. It is part of the Scottsbluff, Nebraska Micropolitan Statistical Area. The population was 341 at the 2010 census. Lyman, less than a mile from the Wyoming border, is sited south of Horse Creek, a tributary of the North Platte River in western Nebraska. Due to its semi-arid climate, the area did not develop as early as other areas in the state with more moisture.