Chestnut Ridge Transportation Co. - served Greensburg, Blairsville, Derry, Bradenville, Loyalhanna, Latrobe, St. Vincent College.
Hamilton Bus Line - connected Greensburg with Humphries, Marguerite.
Kepple Coach Lines - suburban served Greensburg, Delmont, Slickville, Jeanette, Export, Trafford, Wilmerding, Pitcairn, East Pittsburgh, New Kensington.
Lincoln Coach Lines - served Pittsburgh, Irwin, Manor, Greensburg, Braddock, Jeanette, East Pittsburgh, Claridge, Wilmerding, city service in Jeanette.
Rolling Acres Bus - suburban served Greensburg, Georges Station, Donohoe, Rolling Acres, Lloydsville, Latrobe.
Mountain View Trailways - suburban served Latrobe, Mt. Pleasant, Scottdale, Ruffsdale, New Stanton.
Hutchinson Bus Lines - served Ligonier, New Florence, Armogh, Johnstown, Seward.