Places beginning with PE in Illinois, United States
- Peabody
- Peach Orchard, Township of
- Pea Ridge, Township of
- Pearl
- Pearl City
- Pearl, Township of
- Pebble Beach
- Pecatonica
- Pecatonica, Township of
- Pegram
- Pekin
- Pekin Heights
- Pekin, Township of
- Pella, Township of
- Pellville
- Pembroke, Township of
- Pendleton, Township of
- Penfield
- Pennington Point
- Pennock (subdivision)
- Pennsylvania, Township of
- Penn, Township of
- Penn, Township of
- Penrose
- Peoria
- Peoria City, Township of
- Peoria County
- Peoria Heights
- Peotone
- Peotone, Township of
- Pepper Tree (subdivision)
- Percy
- Percy Election Precinct
- Perdueville
- Perkins (historical)
- Perks
- Perks Election Precinct
- Perry
- Perry County
- Perryton, Township of
- Perry, Township of
- Perryville
- Pershing
- Persifer, Township of
- Peru
- Peru, Township of
- Pesotum
- Pesotum, Township of
- Petersburg
- Petersburg
- Petersburg East Number 13 Election Precinct
- Petersburg North Number 14 Election Precinct
- Petersburg South Number 15 Election Precinct
- Petersburg West Number 16 Election Precinct
- Peters Creek
- Peterstown
- Petersville
- Peterville
- Petrolia
- Petty, Township of