Towns
| State | City/Town | Town Title |
|---|---|---|
| Illinois | Philo | Philo, IL |
| Illinois | Piasa | Piasa, IL |
| Illinois | Pierron | Pierron, IL |
| Illinois | Pinckneyville | Pinckneyville, IL |
| Illinois | Piper City | Piper City, IL |
| Illinois | Pittsburg | Pittsburg, IL |
| Illinois | Pittsfield | Pittsfield, IL |
| Illinois | Plainfield | Plainfield, IL |
| Illinois | Plainville | Plainville, IL |
| Illinois | Plano | Plano, IL |
| Illinois | Plato Center | Plato Center, IL |
| Illinois | Pleasant Hill | Pleasant Hill, IL |
| Illinois | Pleasant Plains | Pleasant Plains, IL |
| Illinois | Plymouth | Plymouth, IL |
| Illinois | Pocahontas | Pocahontas, IL |
| Illinois | Polo | Polo, IL |
| Illinois | Pomona | Pomona, IL |
| Illinois | Pontiac | Pontiac, IL |
| Illinois | Poplar Grove | Poplar Grove, IL |
| Illinois | Port Byron | Port Byron, IL |
| Illinois | Posen | Posen, IL |
| Illinois | Potomac | Potomac, IL |
| Illinois | Prairie City | Prairie City, IL |
| Illinois | Prairie Du Rocher | Prairie Du Rocher, IL |
| Illinois | Preemption | Preemption, IL |