The Pittsburgh Alleghenys (pirates) is founded and play in the American Association
The Smithfield Street Bridge opened March 19th
Coraopolis became a municipality
Allegheny General Hospital opened Feb 15th
The Pittsburgh Alleghenys (pirates) join the National League
Oakmont became a municipality
In 1889 Oakmont was incorporated from the second ward of the Borough of Verona with 1,600 residents, a dozen stores and four sizable industries:
Slippery Rock University was founded