Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Phemister Hall | Building | 181 | Cook | 41 47 27 N | 087 36 12 W |
| Phenix School (historical) | School | 204 | Henry | 41 31 12 N | 090 08 33 W |
| Philadelphia | Populated Place | 189 | Cass | 39 55 26 N | 090 07 02 W |
| Philadelphia Assembly of God Church | Church | 183 | Cook | 41 58 51 N | 087 40 05 W |
| Philadelphia Church | Church | 155 | Hardin | 37 34 25 N | 088 17 15 W |
| Philadelphia Church of God in Christ | Church | 181 | Cook | 41 47 00 N | 087 39 55 W |
| Philadelphia Church of God in Christ School | School | 182 | Cook | 41 47 06 N | 087 39 56 W |
| Philadelphia Missionary Baptist Church | Church | 183 | Cook | 41 52 57 N | 087 42 36 W |
| Philadelphia Romanian Pentecostal Church of God | Church | 183 | Cook | 41 56 56 N | 087 39 54 W |
| Philadelphia School (historical) | School | 159 | Hardin | 37 34 26 N | 088 17 15 W |
| Philadelphia School (historical) | School | 210 | Pike | 39 41 54 N | 090 57 16 W |
| Philbrick Park | Park | 183 | Cook | 42 03 24 N | 087 40 56 W |
| Philip Lynch Theatre | Building | 201 | Will | 41 36 25 N | 088 04 55 W |
| Philip Murray Homes (subdivision) | Populated Place | 179 | Cook | 41 39 31 N | 087 36 19 W |
| Phillip H Krohe Airport | Airport | 137 | Cass | 39 56 10 N | 090 28 00 W |
| Phillip J Rock School | School | 236 | DuPage | 41 51 42 N | 088 03 07 W |
| Phillip Stanger School | School | 182 | Cook | 41 52 42 N | 087 37 35 W |
| Phillippe Cemetery | Cemetery | 219 | Champaign | 40 13 21 N | 088 21 26 W |
| Phillippe Creek | Stream | | Champaign | 40 13 37 N | 088 21 34 W |
| Phillips Academy | School | 183 | Cook | 41 49 28 N | 087 37 11 W |
| Phillips Branch | Stream | | Marion | 38 43 29 N | 088 45 26 W |
| Phillips Cemetery | Cemetery | 177 | Alexander | 37 18 08 N | 089 21 43 W |
| Phillips Cemetery | Cemetery | 134 | Franklin | 38 03 13 N | 088 49 17 W |
| Phillips Cemetery | Cemetery | 187 | Livingston | 41 05 12 N | 088 48 00 W |
| Phillips Cemetery | Cemetery | 157 | Marion | 38 33 06 N | 089 01 55 W |
| Phillips Cemetery | Cemetery | 168 | Marion | 38 44 14 N | 088 44 39 W |
| Phillips Cemetery | Cemetery | 184 | Morgan | 39 48 08 N | 090 11 10 W |
| Phillips Cemetery | Cemetery | 188 | Schuyler | 40 15 51 N | 090 29 58 W |
| Phillips Cemetery | Cemetery | 228 | Winnebago | 42 25 08 N | 089 09 01 W |
| Phillips Ferry (historical) | Crossing | 130 | Scott | 39 42 12 N | 090 38 46 W |
| Phillips Park | Park | 211 | Kane | 41 44 12 N | 088 17 32 W |
| Phillips School (historical) | School | 99 | Alexander | 37 05 41 N | 089 18 26 W |
| Phillips School (historical) | School | 246 | Livingston | 40 38 01 N | 088 15 18 W |
| Phillips School (historical) | School | 212 | Tazewell | 40 35 06 N | 089 24 44 W |
| Phillips Station (historical) | Locale | 159 | Fulton | 40 26 47 N | 090 11 29 W |
| Phillipstown | Populated Place | 166 | White | 38 08 31 N | 088 01 18 W |
| Phillipstown Oil Field | Oilfield | 145 | White | 38 11 58 N | 088 02 13 W |
| Philo | Populated Place | 224 | Champaign | 40 00 25 N | 088 09 29 W |
| Philo Grade School | School | 224 | Champaign | 40 00 23 N | 088 09 33 W |
| Philo Presbyterian Church | Church | 226 | Champaign | 40 00 16 N | 088 09 32 W |
| Phils Airstrip | Airport | 200 | Stark | 40 59 26 N | 089 48 06 W |
| Phils Creek | Stream | | Jersey | 39 13 26 N | 090 18 08 W |
| Phinney Branch | Stream | | Champaign | 40 05 12 N | 088 18 52 W |
| Phipps Airport | Airport | 204 | Kankakee | 41 14 35 N | 087 51 01 W |
| Phipps Lecture Hall | Building | 213 | Coles | 39 28 58 N | 088 10 36 W |
| Phipps School (historical) | School | 218 | Coles | 39 26 55 N | 088 18 30 W |
| Phoenix | Populated Place | 183 | Cook | 41 36 40 N | 087 38 05 W |
| Phoenix Post Office (historical) | Post Office | 211 | Douglas | 39 51 15 N | 087 59 06 W |
| Phoenix School (historical) | School | 244 | McLean | 40 33 07 N | 088 49 32 W |
| Phyllis Field | Airport | 261 | Henry | 42 13 16 N | 088 25 04 W |
| Piankashawtown (historical) | Populated Place | 127 | Edwards | 38 25 52 N | 088 05 45 W |
| Piasa | Populated Place | 181 | Macoupin | 39 06 57 N | 090 07 25 W |
| Piasa Cemetery | Cemetery | 189 | Macoupin | 39 06 55 N | 090 07 32 W |
| Piasa Creek | Stream | | Jersey | 38 56 09 N | 090 17 11 W |
| Piasa Creek Access Area | Locale | 132 | Jersey | 38 56 18 N | 090 17 20 W |
| Piasa Hills | Populated Place | 172 | Madison | 38 57 08 N | 090 15 30 W |
| Piasa Island | Island | 125 | Jersey | 38 55 51 N | 090 16 38 W |
| Piasa Post Office | Post Office | 182 | Macoupin | 39 06 57 N | 090 07 23 W |
| Piatt | Populated Place | 206 | Piatt | 39 55 59 N | 088 31 13 W |
| Piatt Cemetery | Cemetery | 247 | Henry | 41 13 20 N | 090 11 13 W |
| Piatt County | Civil | 210 | Piatt | 40 00 02 N | 088 35 00 W |
| Piatt County Airport | Airport | 224 | Piatt | 40 00 20 N | 088 33 30 W |
| Piatt County Courthouse | Building | 204 | Piatt | 40 01 30 N | 088 34 21 W |
| Piatt County Jail | Building | 202 | Piatt | 40 01 34 N | 088 34 22 W |
| Piatt Creek | Stream | | Montgomery | 39 02 23 N | 089 15 33 W |
| Piatt School (historical) | School | 208 | Piatt | 40 04 13 N | 088 35 54 W |
| Picayune Chute | Stream | | Union | 37 19 45 N | 089 28 58 W |
| Picayune Island | Island | 104 | Alexander | 37 19 58 N | 089 25 22 W |
| Picayune School (historical) | School | 214 | Warren | 40 47 24 N | 090 39 24 W |
| Piccadilly Hall | Building | 180 | Cook | 41 48 08 N | 087 35 25 W |
| Piccolo Specialty School | School | 184 | Cook | 41 54 01 N | 087 43 55 W |
| Pick Cemetery | Cemetery | 131 | Perry | 38 04 57 N | 089 20 56 W |
| Pick Landing Strip | Airport | 211 | Livingston | 40 45 58 N | 088 36 33 W |
| Pickard Elementary School | School | 182 | Cook | 41 51 11 N | 087 40 59 W |
| Pickard School (historical) | School | 287 | Stephenson | 42 21 26 N | 089 46 09 W |
| Pickeral Park | Park | 212 | Kane | 41 59 08 N | 088 17 33 W |
| Pickerel Point | Cape | 224 | Lake | 42 22 31 N | 088 07 35 W |
| Pickerell Cemetery | Cemetery | 176 | Sangamon | 39 48 56 N | 089 23 40 W |
| Picket Lake | Lake | 135 | Mason | 40 04 11 N | 090 13 59 W |
| Pickett School (historical) | School | 254 | McLean | 40 31 55 N | 089 01 16 W |
| Pickle Creek | Stream | | Clay | 38 43 23 N | 088 41 08 W |
| Pickwick Place Shopping Center | Locale | 231 | DuPage | 41 51 36 N | 088 03 31 W |
| Pielet Summit Heliport | Airport | 181 | Cook | 41 47 00 N | 087 49 11 W |
| Pielet-Calumet Heliport | Airport | 179 | Cook | 41 39 43 N | 087 34 38 W |
| Pielet-Joliet Heliport | Airport | 165 | Will | 41 31 01 N | 088 05 24 W |
| Pierce Cemetery | Cemetery | 190 | Iroquois | 40 47 36 N | 087 47 11 W |
| Pierce Cemetery | Cemetery | 227 | Pike | 39 45 07 N | 090 59 45 W |
| Pierce Cemetery | Cemetery | 208 | Warren | 40 42 59 N | 090 33 29 W |
| Pierce Community Church | Church | 244 | DeKalb | 41 50 09 N | 088 37 12 W |
| Pierce Creek | Stream | | Jefferson | 38 21 14 N | 089 00 17 W |
| Pierce Downer Cemetery | Cemetery | 231 | DuPage | 41 48 16 N | 088 00 58 W |
| Pierce Downer Elementary School | School | 227 | DuPage | 41 48 21 N | 088 01 12 W |
| Pierce Elementary School | School | 180 | Cook | 41 58 58 N | 087 39 59 W |
| Pierce Family Cemetery | Cemetery | 205 | La Salle | 41 34 15 N | 088 46 18 W |
| Pierce Lake | Reservoir | 251 | Winnebago | 42 20 49 N | 088 59 14 W |
| Pierce Lake Dam | Dam | 251 | Winnebago | 42 20 49 N | 088 59 14 W |
| Pierce Memorial Chapel | Church | 235 | DuPage | 41 52 08 N | 088 06 02 W |
| Pierce Mines | Mine | 141 | Pope | 37 31 46 N | 088 25 18 W |
| Pierce Park | Park | 223 | Cook | 41 28 39 N | 087 43 37 W |
| Pierce Park | Park | 204 | Hancock | 40 15 23 N | 091 11 15 W |
| Pierce Quarry | Mine | 254 | Jo Daviess | 42 17 59 N | 089 58 50 W |
| Pierce School | School | 156 | Peoria | 40 55 13 N | 089 29 26 W |
| Pierce School (historical) | School | 134 | Franklin | 37 56 11 N | 089 06 52 W |
| Pierce School (historical) | School | 202 | Iroquois | 40 51 39 N | 087 38 36 W |
| Pierce School (historical) | School | 232 | Kane | 41 58 35 N | 088 16 01 W |
| Pierce School (historical) | School | 232 | Knox | 41 07 58 N | 090 09 51 W |
| Pierceburg | Populated Place | 139 | Crawford | 38 55 50 N | 087 54 28 W |
| Pierces Park (subdivision) | Populated Place | 181 | Cook | 41 44 45 N | 087 35 33 W |
| Pierceville Post Office (historical) | Post Office | 244 | DeKalb | 41 49 55 N | 088 40 00 W |
| Pierre Menard Home Historic Site | Park | 164 | Randolph | 37 57 50 N | 089 54 21 W |