Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Plain Tree School (historical) | School | 180 | Effingham | 39 07 59 N | 088 24 57 W |
| Plain View Cemetery | Cemetery | 148 | White | 37 55 35 N | 088 13 41 W |
| Plaines Station | Locale | 157 | Will | 41 29 29 N | 088 07 12 W |
| Plainfield | Populated Place | 171 | Jasper | 39 06 13 N | 088 08 07 W |
| Plainfield | Populated Place | 188 | Will | 41 37 37 N | 088 12 14 W |
| Plainfield Cemetery | Cemetery | 170 | Jasper | 39 06 19 N | 088 08 04 W |
| Plainfield Cemetery | Cemetery | 185 | Will | 41 36 07 N | 088 11 58 W |
| Plainfield Elementary School | School | 198 | Cook | 42 01 09 N | 087 54 09 W |
| Plainfield High School | School | 184 | Will | 41 36 08 N | 088 12 23 W |
| Plainfield Plaza Shopping Center | Locale | 186 | Will | 41 36 06 N | 088 12 13 W |
| Plainfield Post Office | Post Office | 186 | Will | 41 36 28 N | 088 12 17 W |
| Plainfield Public Library | Building | 186 | Will | 41 36 32 N | 088 12 13 W |
| Plainfield Quarry | Mine | 191 | Will | 41 38 30 N | 088 09 35 W |
| Plainfield School (historical) | School | 171 | Jasper | 39 06 14 N | 088 08 07 W |
| Plainfield United Methodist Church | Church | 186 | Will | 41 36 28 N | 088 12 14 W |
| Plainfield Village Hall | Building | 185 | Will | 41 37 17 N | 088 12 12 W |
| Plainview | Populated Place | 187 | Macoupin | 39 09 33 N | 089 59 23 W |
| Plainview Campground | Locale | 186 | Clark | 39 20 18 N | 087 42 33 W |
| Plainview Cemetery | Cemetery | 274 | Ogle | 42 02 33 N | 089 26 12 W |
| Plainview Church | Church | 146 | White | 37 55 37 N | 088 13 45 W |
| Plainview Post Office | Post Office | 187 | Macoupin | 39 09 33 N | 089 59 26 W |
| Plainview School | School | 212 | Cook | 41 46 59 N | 087 53 29 W |
| Plainview School | School | 208 | Moultrie | 39 42 20 N | 088 30 38 W |
| Plainview School (historical) | School | 235 | Ford | 40 33 35 N | 088 10 35 W |
| Plainview School (historical) | School | 186 | Logan | 40 01 39 N | 089 23 46 W |
| Plainville | Populated Place | 211 | Adams | 39 47 09 N | 091 11 08 W |
| Plamondon Elementary School | School | 181 | Cook | 41 51 38 N | 087 41 33 W |
| Plank Cemetery | Cemetery | 189 | Shelby | 39 27 50 N | 088 52 08 W |
| Plank Road Meadow | Flat | 187 | Cook | 41 49 01 N | 087 49 58 W |
| Plank Road School (historical) | School | 126 | Lawrence | 38 42 23 N | 087 35 24 W |
| Plano | Populated Place | 198 | Kendall | 41 39 46 N | 088 32 13 W |
| Plano Cemetery | Cemetery | 201 | Kendall | 41 40 23 N | 088 32 27 W |
| Plano Christian Church | Church | 201 | Kendall | 41 41 07 N | 088 31 06 W |
| Plano High School | School | 201 | Kendall | 41 39 57 N | 088 32 47 W |
| Plano Middle School | School | 197 | Kendall | 41 39 20 N | 088 31 58 W |
| Plano Post Office | Post Office | 199 | Kendall | 41 39 50 N | 088 32 16 W |
| Plant School (historical) | School | 167 | Bond | 38 54 59 N | 089 29 30 W |
| Plaster Grove Church | Church | 139 | Franklin | 37 56 51 N | 088 45 41 W |
| Plato Bridge | Bridge | 187 | Iroquois | 40 51 33 N | 087 50 29 W |
| Plato Center | Populated Place | 281 | Kane | 42 01 36 N | 088 25 48 W |
| Plato Center Elementary School | School | 282 | Kane | 42 01 35 N | 088 25 40 W |
| Plato Corners | Populated Place | 262 | Kane | 41 59 13 N | 088 24 18 W |
| Plato Post Office (historical) | Post Office | 195 | Iroquois | 40 51 28 N | 087 51 54 W |
| Plato School | School | 188 | Cook | 41 52 21 N | 087 45 49 W |
| Plato School (historical) | School | 195 | Iroquois | 40 51 28 N | 087 51 53 W |
| Platt Park | Park | 212 | Whiteside | 41 48 03 N | 089 40 32 W |
| Platt School (historical) | School | 202 | Montgomery | 39 13 55 N | 089 22 59 W |
| Plattville | Populated Place | 181 | Kendall | 41 31 54 N | 088 22 53 W |
| Plattville Cemetery | Cemetery | 183 | Kendall | 41 32 00 N | 088 23 12 W |
| Plattville Evangelical Lutheran Cemetery | Cemetery | 178 | Kendall | 41 29 47 N | 088 21 34 W |
| Plattville Lutheran Church | Church | 179 | Kendall | 41 29 50 N | 088 21 34 W |
| Plattville United Methodist Church | Church | 183 | Kendall | 41 31 58 N | 088 23 09 W |
| Play Island | Island | 228 | Lake | 42 13 59 N | 088 09 15 W |
| Playboy Building | Building | 180 | Cook | 41 53 59 N | 087 37 25 W |
| Players Hill | Summit | 186 | Cook | 41 52 32 N | 087 46 03 W |
| Players Park | Park | 227 | Winnebago | 42 23 33 N | 089 00 37 W |
| Playlot 291 | Park | 180 | Cook | 41 47 48 N | 087 36 01 W |
| Playtime Park | Park | 183 | Cook | 42 02 18 N | 087 43 20 W |
| Plaza Del Grato Shopping Center | Locale | 211 | Cook | 42 03 29 N | 088 00 19 W |
| Plaza del Lago Shopping Center | Locale | 186 | Cook | 42 05 12 N | 087 42 01 W |
| Plaza Del Prado Shopping Center | Locale | 206 | Cook | 42 06 18 N | 087 50 54 W |
| Plaza Heliport | Airport | 201 | Cook | 42 06 22 N | 087 52 14 W |
| Plaza North Shopping Center | Locale | 228 | Lee | 41 51 40 N | 089 29 59 W |
| Plaza Verde Shopping Center | Locale | 215 | Cook | 42 08 17 N | 087 59 13 W |
| Plaza West Shopping Center | Locale | 216 | Cook | 41 28 54 N | 087 41 04 W |
| Pleak | Populated Place | 209 | Shelby | 39 35 44 N | 088 56 18 W |
| Pleasant Acres Elementary School | School | 224 | Champaign | 40 18 28 N | 088 07 34 W |
| Pleasant Arbor School (historical) | School | 174 | Tazewell | 40 28 11 N | 089 37 07 W |
| Pleasant Bluff School (historical) | School | 213 | Rock Island | 41 34 15 N | 090 20 13 W |
| Pleasant Cove School (historical) | School | 161 | Jersey | 39 03 55 N | 090 30 02 W |
| Pleasant Dale Church | Church | 192 | Fulton | 40 18 45 N | 090 21 46 W |
| Pleasant Dale Church | Church | 192 | Macoupin | 39 24 47 N | 089 53 50 W |
| Pleasant Dale Church (historical) | Church | 148 | Calhoun | 39 21 10 N | 090 39 15 W |
| Pleasant Dale North School | School | 197 | Cook | 41 45 16 N | 087 53 51 W |
| Pleasant Dale School (historical) | School | 201 | Calhoun | 39 19 46 N | 090 40 15 W |
| Pleasant Dale School (historical) | School | 134 | Clay | 38 44 46 N | 088 16 34 W |
| Pleasant Dale School (historical) | School | 192 | Fulton | 40 18 58 N | 090 21 45 W |
| Pleasant Dale Valley | Valley | | Calhoun | 39 22 00 N | 090 38 16 W |
| Pleasant Drink School (historical) | School | 243 | Stark | 41 09 46 N | 089 42 07 W |
| Pleasant Falls School (historical) | School | 211 | Piatt | 40 05 54 N | 088 37 50 W |
| Pleasant Gale United Brethren Church (historical) | Church | 240 | McDonough | 40 37 03 N | 090 45 05 W |
| Pleasant Gift Missionary Baptist Church | Church | 181 | Cook | 41 48 44 N | 087 35 58 W |
| Pleasant Green Cemetery | Cemetery | 222 | Warren | 40 58 28 N | 090 47 10 W |
| Pleasant Green Post Office (historical) | Post Office | 237 | Stark | 41 09 20 N | 089 42 20 W |
| Pleasant Green School (historical) | School | 222 | Warren | 40 58 27 N | 090 47 09 W |
| Pleasant Grove | Populated Place | 134 | Johnson | 37 26 27 N | 089 01 47 W |
| Pleasant Grove Baptist Church | Church | 201 | Coles | 39 35 08 N | 088 24 51 W |
| Pleasant Grove Baptist Church | Church | 181 | Cook | 41 52 18 N | 087 41 54 W |
| Pleasant Grove Baptist Church | Church | 158 | Peoria | 40 40 17 N | 089 37 53 W |
| Pleasant Grove Cemetery | Cemetery | 201 | Coles | 39 35 10 N | 088 24 48 W |
| Pleasant Grove Cemetery | Cemetery | 192 | Douglas | 39 44 19 N | 088 04 24 W |
| Pleasant Grove Cemetery | Cemetery | 183 | Effingham | 39 08 42 N | 088 46 37 W |
| Pleasant Grove Cemetery | Cemetery | 228 | Ford | 40 24 23 N | 087 59 02 W |
| Pleasant Grove Cemetery | Cemetery | 171 | Jefferson | 38 22 26 N | 088 55 29 W |
| Pleasant Grove Cemetery | Cemetery | 202 | McDonough | 40 17 55 N | 090 35 32 W |
| Pleasant Grove Cemetery | Cemetery | 265 | McLean | 40 25 40 N | 088 50 39 W |
| Pleasant Grove Cemetery | Cemetery | 214 | Peoria | 40 40 41 N | 089 50 47 W |
| Pleasant Grove Cemetery | Cemetery | 220 | Pike | 39 38 59 N | 090 47 39 W |
| Pleasant Grove Cemetery | Cemetery | 174 | Shelby | 39 13 01 N | 088 53 54 W |
| Pleasant Grove Cemetery | Cemetery | 194 | Vermilion | 40 08 31 N | 087 46 44 W |
| Pleasant Grove Cemetery | Cemetery | 155 | Washington | 38 22 32 N | 089 16 57 W |
| Pleasant Grove Cemetery | Cemetery | 154 | Williamson | 37 44 38 N | 088 47 58 W |
| Pleasant Grove Church | Church | 221 | Adams | 39 55 07 N | 091 11 09 W |
| Pleasant Grove Church | Church | 157 | Crawford | 39 08 38 N | 087 43 01 W |
| Pleasant Grove Church | Church | 163 | Crawford | 39 08 38 N | 087 52 17 W |
| Pleasant Grove Church | Church | 155 | Hamilton | 38 04 56 N | 088 38 07 W |
| Pleasant Grove Church | Church | 172 | Jefferson | 38 22 24 N | 088 55 29 W |
| Pleasant Grove Church | Church | 182 | Marion | 38 31 11 N | 088 50 18 W |
| Pleasant Grove Church | Church | 171 | Marion | 38 34 08 N | 088 58 52 W |
| Pleasant Grove Church | Church | 169 | Marion | 38 42 03 N | 088 50 01 W |