- Picardy
- Piney Grove
- Pleasant Valley
- Potomac
- Potomac Park
- Pratt
- Pumpkin Center
- Pack Town
- Palisades on the Severn
- Palisades Park
- Paradise Beach
- Parke West
- Parker Island (historical)
- Parkview
- Parkway Hills Mobile Home Park
- Parkwood
- Parvilla
- Pasadena Beach
- Pasadena Manor
- Patapsco
- Patapsco Park
- Patuxent
- Patuxent Manor
- Patuxent Mobile Estates
- Patuxent River Estates
- Pendennis Mount
- Pennbrooke
- Pettebone Farms
- Phyllis Estates
- Pig Point