- Kane (Population: 4,126)
- Kenhorst (Population: 2,679)
- Kenilworth (Population: 1,576)
- Kennedy Township (Population: 7,504)
- Kennett Square (Population: 5,273)
- King of Prussia (Population: 18,511)
- Kingston (Population: 13,855)
- Kittanning (Population: 4,787)
- Knox (Population: 1,176)
- Kulpmont (Population: 2,985)
- Kulpsville (Population: 8,005)
- Kutztown (Population: 5,067)

