- Paderborn
- Palatine
- Palestine
- Palmer
- Palmyra
- Palmyra
- Palos Heights
- Palos Hills
- Palos Park
- Pana
- Panama
- Panola
- Papineau
- Paris
- Park City
- Park Forest
- Park Ridge
- Parkersburg
- Patoka
- Patterson
- Paw Paw
- Pawnee
- Paxton
- Payson
- Pearl
- Pearl City
- Pecatonica
- Pekin
- Penfield
- Peoria
- Peoria Heights
- Peotone
- Percy
- Perry
- Peru
- Pesotum
- Petersburg
- Phillipstown
- Philo
- Phoenix
- Pierron
- Pinckneyville
- Pingree Grove
- Piper City
- Pistakee Highlands
- Pittsburg
- Pittsfield
- Plainfield
- Plainville
- Plano
- Plattville
- Pleasant Hill
- Pleasant Hill
- Pleasant Plains
- Plymouth
- Pocahontas
- Polo
- Pontiac
- Pontoon Beach
- Pontoosuc
- Poplar Grove
- Port Barrington
- Port Byron
- Portage Park
- Posen
- Potomac
- Prairie City
- Prairie du Rocher
- Prairie Grove
- Prestbury
- Preston Heights
- Princeton
- Princeville
- Prophetstown
- Prospect Heights
- Pulaski
