Formed September 19, 1789 from Cumberland and Northumberland counties, and named for Thomas Mifflin, Governor, 1790-99. County seat, Lewistown, was laid out 1790; incorporated 1795. Important in Pennsylvania's canal development and early iron industry.

Marker is at the intersection of Market Street and Main Street, on the right when traveling west on Market Street.

Courtesy hmdb.org

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