Westmoreland County. Formed on Feb 26, 1773 from Bedford County, it once comprised most of southwest Pennsylvania. First seat of English justice west of Alleghenies. Site of 1775 "Hanna's Town Resolves." Greensburg, county seat, was incorporated 1799.

NE corner, Courthouse Square, Main & Otterman Sts., Greensburg, PA, United States

Toll House. Just northeast of here stood 1 of 5 gates of Greensburg-Pittsburgh Turnpike Road Co. The turnpike, a section of the Pittsburgh-Philadelphia road, was completed in 1817. Over it, passed goods in trade between east and west.

Mount Odin Park, Tollgate Hill Rd. (Bus. Rt. 30), Greensburg, PA, United States

Toll House. Site of toll house of the Stoyestown-Greensburg Turnpike Road Co. The turnpike, a section of the Philadelphia-Pittsburgh road, was completed in 1819 at a cost of about $6,000 a mile. State took over the turnpike in 1911.

E. Pittsburgh St., east of Stark St., Greensburg, PA, United States

Fort Allen. A little south, site of post built 1774 by Pennsylvania German pioneers of Brush Creek and Harrold's settlements. A refuge from the Indians in Dunmore's War and American Revolution.

Pa. 136 at SR 3097, Hempfield Twp, Greensburg, PA, United States

Arthur St. Clair (1737-1818). President, Continental Congress, 1787; member, 1785-87. First Governor of the Northwest Territory (lying between the Ohio and Mississippi Rivers), 1787-1802. Earlier, he was Westmoreland County Court Justice after the county's formation in 1773, and Major General in the Revolutionary War, 1777. A native of Thurso, Scotland, he lived his last years on Chestnut Ridge, near Ligonier, and is buried just east of this marker.

St. Clair Park, N. Main St. near E Otterman St., Greensburg, PA, United States