Formed March 26, 1804 out of Lycoming County and named for President Thomas Jefferson. Until 1806 attached to Westmoreland County, then to Indiana County until 1830. Noted for its coal and lumber industries. Brookville, county seat, was incorporated 1834.

Marker can be reached from the intersection of Main Street (U.S. 322) and Pickering Street.

Courtesy hmdb.org

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