Mottled sculpin are widespread in North America, but there are several populations that are isolated from each other. Eastern populations are found throughout the Great Lakes region, north to Hudson Bay and throughout much of eastern Canada and south to northern Alabama and Mississippi. There is a smaller population in Missouri and a large western population in the northern Rocky Mountain states, from British Columbia and Alberta south to southern Nevada and northern New Mexico.
Biogeographic Regions: nearctic (Native )
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