Home » Lewis and Clark / Cascade Featured County Lewis and Clark / Cascade Population: 519 (2021) Elevation: 3,511′ Average Income: $53,295 (2021) Belt Population: 836 (2020) Elevation: 3,379′ Average Income: $51,406 (2021) Black Eagle Population: 601 (2021) Elevation: 3,389' Average Income: $38,958 (2021) Cascade Population: 60,403 (2021) Elevation: 3,330' Average Income: $53,126 (2021) Great Falls Population: 33,120 (2021) Elevation: 4,045′ Average Income: $84,410 (2021) Helena Population: 1,017 (2020) Elevation: 4,541' Average Income: $38,500 (2021) Lincoln Population: 1,617 (2020) Elevation: 3,340′ Average Income: $46,635 (2021) Sun Prairie Population: 750 (2020) Elevation: 3,350′ Average Income: $92,841 (2021) Ulm Population: 877 (2020) Elevation: 3,366′ Average Income: $40,000 (2021) Vaughn Lewis & Clark County Cascade County