Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Paxton-Buckley-Loda Junior High School | School | 242 | Ford | 40 27 33 N | 088 05 38 W |
| Payne Cemetery | Cemetery | 150 | Bond | 38 47 06 N | 089 15 41 W |
| Payne Cemetery | Cemetery | 204 | Edgar | 39 44 39 N | 087 55 47 W |
| Payne Cemetery | Cemetery | 200 | Hancock | 40 16 40 N | 091 08 37 W |
| Payne Cemetery | Cemetery | 207 | Livingston | 40 45 49 N | 088 40 36 W |
| Payne Cemetery | Cemetery | 270 | McLean | 40 26 31 N | 088 37 50 W |
| Payne School (historical) | School | 204 | Edgar | 39 44 42 N | 087 55 43 W |
| Payne School (historical) | School | 226 | McLean | 40 40 54 N | 088 48 07 W |
| Paynes Point | Populated Place | 275 | Ogle | 42 01 26 N | 089 12 24 W |
| Paynes Point Lutheran Cemetery | Cemetery | 278 | Ogle | 42 01 35 N | 089 12 26 W |
| Paynter School (historical) | School | 236 | Carroll | 41 56 44 N | 089 42 03 W |
| Payson | Populated Place | 232 | Adams | 39 49 01 N | 091 14 33 W |
| Payson Avenue Community Church | Church | 192 | Adams | 39 55 24 N | 091 22 59 W |
| Payson Congregational Church | Church | 232 | Adams | 39 49 02 N | 091 14 28 W |
| Payson New Cemetery | Cemetery | 226 | Adams | 39 48 39 N | 091 14 49 W |
| Payson Old Cemetery | Cemetery | 222 | Adams | 39 48 56 N | 091 14 44 W |
| Paytonville | Populated Place | 157 | Grundy | 41 20 12 N | 088 25 52 W |
| PCI Heliport | Airport | 213 | Macon | 39 55 46 N | 089 00 47 W |
| Pea Green School (historical) | School | 212 | Adams | 39 58 30 N | 090 55 57 W |
| Pea Ridge | Ridge | 202 | Greene | 39 13 45 N | 090 31 50 W |
| Pea Ridge | Ridge | 319 | Jo Daviess | 42 26 33 N | 090 10 58 W |
| Pea Ridge School (historical) | School | 228 | Peoria | 40 41 54 N | 089 55 46 W |
| Pea Ridge School (historical) | School | 149 | Randolph | 38 07 57 N | 089 49 39 W |
| Peabody | Populated Place | 171 | Sangamon | 39 52 39 N | 089 36 03 W |
| Peabody Elementary School | School | 181 | Cook | 41 54 00 N | 087 39 52 W |
| Peabody Lake | Reservoir | 182 | Schuyler | 40 07 42 N | 090 27 12 W |
| Peabody Lake Dam | Dam | 182 | Schuyler | 40 07 42 N | 090 27 12 W |
| Peabody-Pit 6-New Shop Heliport | Airport | 140 | Randolph | 38 10 49 N | 089 46 46 W |
| Peabody-River King Number 1 Mine Heliport | Airport | 147 | St. Clair | 38 26 36 N | 089 52 05 W |
| Peabody-Will Scarlet Heliport | Airport | 141 | Williamson | 37 38 24 N | 088 42 32 W |
| Peace Cemetery | Cemetery | 134 | Randolph | 38 01 04 N | 089 39 31 W |
| Peace Chapel Assembly of God Church | Church | 160 | Grundy | 41 22 13 N | 088 26 09 W |
| Peace Christian Reformed Church | Church | 184 | Cook | 41 35 23 N | 087 35 45 W |
| Peace Church | Church | 182 | Rock Island | 41 32 31 N | 090 19 53 W |
| Peace Community Center | Building | 156 | Peoria | 40 55 13 N | 089 29 27 W |
| Peace Community Church | Church | 227 | Will | 41 30 07 N | 087 51 29 W |
| Peace Evangelical Lutheran Church | Church | 189 | Cook | 41 57 31 N | 087 46 34 W |
| Peace Evangelical Lutheran Church | Church | 215 | Cook | 41 34 50 N | 087 45 17 W |
| Peace Evangelical Lutheran Church | Church | 262 | Winnebago | 42 19 25 N | 089 00 45 W |
| Peace Lutheran Church | Church | 182 | Cook | 41 48 55 N | 087 41 41 W |
| Peace Lutheran Church | Church | 166 | Grundy | 41 22 45 N | 088 25 53 W |
| Peace Lutheran Church | Church | 260 | Lake | 42 10 46 N | 088 04 37 W |
| Peace Lutheran Church | Church | 132 | Randolph | 38 00 30 N | 089 39 24 W |
| Peace Lutheran Church | Church | 186 | Will | 41 36 43 N | 088 12 14 W |
| Peace Memorial Church | Church | 214 | Cook | 41 39 09 N | 087 52 15 W |
| Peace Memorial Home | Building | 190 | Cook | 41 42 33 N | 087 42 04 W |
| Peace Reformed Church | Church | 213 | Cook | 42 03 02 N | 087 58 11 W |
| Peace School | School | 182 | Cook | 41 48 55 N | 087 41 42 W |
| Peace United Church of Christ | Church | 206 | DuPage | 41 57 13 N | 087 56 29 W |
| Peaceful Valley Cemetery | Cemetery | 158 | Marion | 38 36 29 N | 089 03 20 W |
| Peach Orchard Cemetery | Cemetery | 183 | Cumberland | 39 16 45 N | 088 08 54 W |
| Peacock Airport | Airport | 191 | La Salle | 41 26 41 N | 088 43 00 W |
| Peacock Park | Park | 213 | DuPage | 41 58 38 N | 088 00 38 W |
| Peacock Slough | Gut | 147 | Grundy | 41 21 56 N | 088 23 21 W |
| Peacocks Island | Island | 149 | Grundy | 41 21 50 N | 088 23 27 W |
| Peak Cemetery | Cemetery | 187 | Scott | 39 32 52 N | 090 27 22 W |
| Peak School (historical) | School | 171 | Fayette | 39 00 50 N | 089 10 51 W |
| Peaks Park | Park | 186 | Cook | 41 41 48 N | 087 47 14 W |
| Peankishaw Bend | Bend | 116 | Wabash | 38 18 06 N | 087 54 58 W |
| Pearce Cemetery | Cemetery | 233 | Adams | 39 51 44 N | 091 03 32 W |
| Pearce Cemetery | Cemetery | 198 | Kendall | 41 41 25 N | 088 20 22 W |
| Pearce Cemetery | Cemetery | 204 | McDonough | 40 33 55 N | 090 35 52 W |
| Pearcy Camp | Locale | 101 | Massac | 37 05 07 N | 088 32 51 W |
| Pearl | Populated Place | 140 | Pike | 39 27 35 N | 090 37 33 W |
| Pearl Camp | Locale | 206 | McDonough | 40 25 12 N | 090 51 07 W |
| Pearl Chapel United Methodist Church | Church | 157 | Crawford | 38 55 00 N | 087 45 43 W |
| Pearl City | Populated Place | 254 | Stephenson | 42 15 55 N | 089 49 33 W |
| Pearl City High School | School | 254 | Stephenson | 42 16 02 N | 089 49 46 W |
| Pearl Island | Island | 151 | Pike | 39 42 24 N | 091 20 06 W |
| Pearl Lake | Lake | 223 | Winnebago | 42 28 52 N | 089 01 33 W |
| Pearson School (historical) | School | 202 | Iroquois | 40 55 32 N | 088 06 47 W |
| Pearson School (historical) | School | 209 | Livingston | 40 48 25 N | 088 29 13 W |
| Pearsons Hall | Building | 184 | Cook | 42 03 00 N | 087 40 46 W |
| Pearsons Hall | Building | 159 | St. Clair | 38 36 25 N | 089 48 58 W |
| Pease Hill School (historical) | School | 216 | Knox | 40 44 04 N | 090 03 42 W |
| Peasley Cemetery | Cemetery | 213 | Henderson | 40 42 53 N | 090 56 01 W |
| Peasley School (historical) | School | 217 | Henderson | 40 43 07 N | 090 57 41 W |
| Pebble Beach | Populated Place | 159 | Grundy | 41 20 22 N | 088 24 00 W |
| Pebble Park | Park | 262 | Cook | 42 06 10 N | 088 07 31 W |
| Pebblewood Plaza Shopping Center | Locale | 216 | DuPage | 41 47 43 N | 088 12 16 W |
| Pecan Creek | Stream | | Mason | 40 07 51 N | 089 59 24 W |
| Pecan Grove School (historical) | School | 129 | Greene | 39 09 34 N | 090 35 48 W |
| Pecan Island | Island | 141 | Fayette | 38 53 24 N | 089 06 36 W |
| Pecan Lake | Lake | 133 | Calhoun | 39 21 21 N | 090 50 36 W |
| Pecatonica | Populated Place | 235 | Winnebago | 42 18 50 N | 089 21 33 W |
| Pecatonica Bottoms Nature Preserve | Park | 222 | Winnebago | 42 21 22 N | 089 19 07 W |
| Pecatonica Cemetery | Cemetery | 252 | Winnebago | 42 18 23 N | 089 22 38 W |
| Pecatonica Elementary School | School | 244 | Winnebago | 42 18 37 N | 089 21 41 W |
| Pecatonica Forest Preserve | Park | 228 | Winnebago | 42 21 11 N | 089 04 24 W |
| Pecatonica High School | School | 234 | Winnebago | 42 18 23 N | 089 21 40 W |
| Pecatonica Post Office | Post Office | 236 | Winnebago | 42 18 48 N | 089 21 38 W |
| Pecatonica Public Library | Building | 236 | Winnebago | 42 18 49 N | 089 21 35 W |
| Pecatonica River | Stream | | Winnebago | 42 27 00 N | 089 04 30 W |
| Pecatonica United Methodist Church | Church | 241 | Winnebago | 42 18 43 N | 089 21 28 W |
| Peck Building | Building | 181 | Cook | 41 53 03 N | 087 37 34 W |
| Peck Cemetery | Cemetery | 207 | Macon | 39 55 35 N | 088 46 02 W |
| Peck Cemetery | Cemetery | 201 | McDonough | 40 18 55 N | 090 35 49 W |
| Peck Elementary School | School | 185 | Cook | 41 47 17 N | 087 43 09 W |
| Peck Lake | Lake | 217 | Kane | 41 52 04 N | 088 21 39 W |
| Peck Park | Park | 234 | Knox | 40 57 07 N | 090 21 27 W |
| Peck Park | Park | 186 | La Salle | 41 19 17 N | 088 50 26 W |
| Peck School (historical) | School | 233 | Kane | 41 52 43 N | 088 21 36 W |
| Peck School (historical) | School | 210 | Macon | 39 55 55 N | 088 45 16 W |
| Peckerwood Lake | Reservoir | 152 | Jefferson | 38 21 37 N | 088 57 07 W |
| Pecumsaugan Creek | Stream | | La Salle | 41 20 16 N | 089 02 45 W |
| Pecumsaugan Creek - Blackball Mines Nature Preserve | Park | 177 | La Salle | 41 20 30 N | 089 02 30 W |
| Peddicord School (historical) | School | 187 | La Salle | 41 25 43 N | 088 45 05 W |
| Peddicord School (historical) | School | 217 | La Salle | 41 22 19 N | 088 40 16 W |
| Peebles Cemetery | Cemetery | 181 | Macoupin | 39 15 30 N | 090 03 52 W |
| Peelman Pond | Lake | 167 | Vermilion | 40 07 19 N | 087 43 52 W |