Frontier, county (980 sq mi/2,538 sq km; 1990 pop. 3,101), S Nebr.; Stockville; 40°31'N 100°23'W. Agr. region drained by Medicine Creek and other branches of Republican R. Corn, wheat, sorghum; livestock. Red Willow Recreation Area in SW (Hugh Butler L.); Medicine Creek Reservoir State Recreation Area in SE (Harry D. Struck L.). Formed 1872.
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