EIGHTY FOUR PENNSYLVANIA

Eighty Four is a small unincorporated community southwest of Pittsburgh. It was originally named Smithville, but Pennsylvania already had a Smithville (also a New Smithville), so the USPS required a name change to avoid postal confusion. The true origin of the name is unknown, but its been suggested that the number comes from the towns place along the 84th mile of the Baltimore and Ohio Railroad line, or the year the post office was built.