| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Piankashawtown (historical) | city | Illinois | United States | 38.43 | -88.10 | 403 | |
| Piasa | city | Illinois | United States | 39.12 | -90.12 | 830 | |
| Piasa Hills | city | Illinois | United States | 38.95 | -90.26 | 830 | |
| Piatt | city | Illinois | United States | 39.93 | -88.52 | 830 | |
| Picardy | city | Illinois | United States | 41.56 | -88.16 | 830 | |
| Picardy Circle | city | Illinois | United States | 42.14 | -87.88 | 830 | |
| Pierceburg | city | Illinois | United States | 38.93 | -87.91 | 830 | |
| Pierces Park | city | Illinois | United States | 41.75 | -87.59 | 830 | |
| Pierron | city | Illinois | United States | 38.78 | -89.52 | 830 | |
| Pierron | city | Illinois | United States | 38.78 | -89.60 | 830 | |
| Pierson | city | Illinois | United States | 39.80 | -88.53 | 830 | |
| Pigeon (historical) | city | Illinois | United States | 38.40 | -88.76 | 830 | |
| Pike | city | Illinois | United States | 39.46 | -91.04 | 830 | |
| Pilot Center (historical) | city | Illinois | United States | 41.06 | -88.08 | 830 | |
| Pilsen | city | Illinois | United States | 41.86 | -87.66 | 830 | |
| Pinckneyville | city | Illinois | United States | 38.08 | -89.38 | 410 | |
| Pine Grove | city | Illinois | United States | 41.34 | -88.40 | 830 | |
| Pine Grove | city | Illinois | United States | 41.95 | -87.64 | 830 | |
| Pine Grove | city | Illinois | United States | 42.11 | -87.85 | 830 | |
| Pine Hills Estates | city | Illinois | United States | 41.59 | -87.96 | 830 | |
| Pine Lake Circle | city | Illinois | United States | 42.17 | -88.06 | 830 | |
| Pine Manor | city | Illinois | United States | 42.23 | -89.04 | 830 | |
| Pine Meadow Estates | city | Illinois | United States | 41.34 | -88.41 | 830 | |
| Pine Needle | city | Illinois | United States | 41.54 | -88.01 | 830 | |
| Pine Valley | city | Illinois | United States | 42.17 | -88.07 | 830 | |
| Pine View | city | Illinois | United States | 41.88 | -88.55 | 846 | |
| Pinehurst Manor | city | Illinois | United States | 42.14 | -88.02 | 830 | |
| Pineview Hills | city | Illinois | United States | 41.62 | -87.92 | 830 | |
| Pingree Grove | city | Illinois | United States | 42.07 | -88.41 | 905 | |
| Pinhook (historical) | city | Illinois | United States | 38.91 | -89.03 | 830 | |
| Pinkstaff | city | Illinois | United States | 38.79 | -87.67 | 830 | |
| Pioneer | city | Illinois | United States | 40.78 | -89.65 | 830 | |
| Piopolis | city | Illinois | United States | 38.18 | -88.56 | 400 | |
| Piper City | city | Illinois | United States | 40.76 | -88.19 | 830 | |
| Pisgah | city | Illinois | United States | 39.67 | -90.13 | 830 | |
| Pistakee | city | Illinois | United States | 42.41 | -88.20 | 830 | |
| Pistakee Highlands | city | Illinois | United States | 42.41 | -88.21 | 830 | |
| Pitcherville (historical) | city | Illinois | United States | 42.36 | -90.00 | 997 | |
| Pitchin | city | Illinois | United States | 40.60 | -87.87 | 830 | |
| Pittsburg | city | Illinois | United States | 37.78 | -88.85 | 830 | |
| Pittsburg | city | Illinois | United States | 38.87 | -89.21 | 830 | |
| Pittsfield | city | Illinois | United States | 39.61 | -90.81 | 830 | |
| Pittwood | city | Illinois | United States | 40.86 | -87.73 | 830 |