Pittsburg is an unincorporated community in Tippecanoe Township, Carroll County, Indiana. It is part of the Lafayette, Indiana Metropolitan Statistical Area. Pittsburg was laid out in 1836. A post office was established at Pittsburg in 1838, and remained in operation until it was discontinued in 1915. The name of the post office was officially spelled Pittsburgh unt…Pittsburg is an unincorporated community in Tippecanoe Township, Carroll County, Indiana. It is part of the Lafayette, Indiana Metropolitan Statistical Area. Pittsburg was laid out in 1836. A post office was established at Pittsburg in 1838, and remained in operation until it was discontinued in 1915. The name of the post office was officially spelled Pittsburgh until 1894.