- Kane
- Kantner
- Kaolin
- Karns City
- Karthaus
- Keeneyville
- Keisterville
- Kelayres
- Kelton
- Kemblesville
- Kempton
- Kenhorst
- Kenilworth
- Kenmawr
- Kennedy Township
- Kennerdell
- Kennett Square
- Kersey
- Kimberton
- King of Prussia
- Kingsley
- Kingston
- Kintnersville
- Kinzers
- Kirkwood
- Kistler
- Kittanning
- Kleinfeltersville
- Klingerstown
- Knauertown