- Pacific Junction
- Packwood
- Palmer
- Palo
- Panama
- Panora
- Panorama Park
- Park View
- Parkersburg
- Parnell
- Paton
- Patterson
- Paullina
- Pella
- Peosta
- Percival
- Perry
- Persia
- Peterson
- Pierson
- Pilot Mound
- Pioneer
- Pisgah
- Plainfield
- Plano
- Pleasant Hill
- Pleasant Plain
- Pleasanton
- Pleasantville
- Plover
- Plymouth
- Pocahontas
- Polk City
- Pomeroy
- Popejoy
- Portland
- Portsmouth
- Postville
- Prairie City
- Prairieburg
- Prescott
- Preston
- Primghar
- Princeton
- Promise City
- Protivin
- Pulaski
