Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Washington Fire Department | Building | 235 | Tazewell | 40 42 19 N | 089 25 21 W |
| Washington Gifted School | School | 220 | Peoria | 40 43 55 N | 089 34 07 W |
| Washington Grove | Woods | 213 | Ogle | 41 57 10 N | 089 16 25 W |
| Washington Grove Cemetery | Cemetery | 228 | Ogle | 41 55 55 N | 089 15 23 W |
| Washington Grove Church | Church | 225 | Ogle | 41 55 52 N | 089 15 11 W |
| Washington Grove School (historical) | School | 223 | Adams | 39 54 53 N | 090 56 27 W |
| Washington Hall | Building | 206 | McDonough | 40 27 48 N | 090 40 50 W |
| Washington Heights (subdivision) | Populated Place | 189 | Cook | 41 42 23 N | 087 39 22 W |
| Washington Heights United Methodist Church | Church | 189 | Cook | 41 42 14 N | 087 39 07 W |
| Washington High School | School | 178 | Cook | 41 41 15 N | 087 32 14 W |
| Washington Intermediate School | School | 150 | Tazewell | 40 33 56 N | 089 38 43 W |
| Washington Junior High School | School | 95 | Alexander | 37 00 12 N | 089 10 31 W |
| Washington Junior High School | School | 210 | DuPage | 41 46 40 N | 088 08 57 W |
| Washington Junior High School | School | 213 | Rock Island | 41 29 33 N | 090 33 10 W |
| Washington Junior High School | School | 162 | Will | 41 31 00 N | 088 04 25 W |
| Washington Memorial Cemetery | Cemetery | 280 | Kane | 42 04 00 N | 088 23 39 W |
| Washington Memory Gardens | Cemetery | 192 | Cook | 41 33 44 N | 087 38 02 W |
| Washington Middle School | School | 210 | Bureau | 41 22 28 N | 089 28 13 W |
| Washington Middle School | School | 208 | Kane | 41 45 34 N | 088 22 05 W |
| Washington Middle School | School | 181 | Sangamon | 39 47 47 N | 089 37 11 W |
| Washington Middle School | School | 231 | Tazewell | 40 42 11 N | 089 23 58 W |
| Washington Park | Park | 183 | Adams | 39 55 57 N | 091 24 33 W |
| Washington Park | Park | 224 | Champaign | 40 06 24 N | 088 14 09 W |
| Washington Park | Park | 182 | Cook | 42 04 42 N | 087 41 05 W |
| Washington Park | Park | 180 | Cook | 41 47 41 N | 087 36 41 W |
| Washington Park | Park | 162 | Crawford | 39 00 40 N | 087 44 50 W |
| Washington Park | Park | 212 | DuPage | 41 53 13 N | 087 55 47 W |
| Washington Park | Park | 220 | DuPage | 41 47 56 N | 088 00 18 W |
| Washington Park | Park | 213 | DuPage | 41 58 03 N | 088 00 38 W |
| Washington Park | Park | 259 | Henry | 41 09 47 N | 090 02 46 W |
| Washington Park | Park | 216 | Kane | 41 51 16 N | 088 18 20 W |
| Washington Park | Park | 207 | Kane | 41 45 23 N | 088 22 00 W |
| Washington Park | Park | 147 | La Salle | 41 20 57 N | 088 50 31 W |
| Washington Park | Park | 186 | La Salle | 41 19 57 N | 089 07 26 W |
| Washington Park | Park | 183 | Lake | 42 21 23 N | 087 50 09 W |
| Washington Park | Park | 104 | Massac | 37 08 55 N | 088 43 57 W |
| Washington Park | Park | 180 | Sangamon | 39 47 25 N | 089 40 59 W |
| Washington Park | Park | 235 | Tazewell | 40 42 48 N | 089 24 40 W |
| Washington Park | Park | 242 | Winnebago | 42 16 22 N | 089 08 25 W |
| Washington Park | Populated Place | 125 | St. Clair | 38 38 06 N | 090 05 34 W |
| Washington Park (subdivision) | Populated Place | 183 | Cook | 41 47 33 N | 087 37 05 W |
| Washington Park Court (subdivision) | Populated Place | 183 | Cook | 41 48 18 N | 087 36 54 W |
| Washington Park First Baptist Church | Church | 126 | St. Clair | 38 38 09 N | 090 05 29 W |
| Washington Park Historic District | Park | 147 | La Salle | 41 20 58 N | 088 50 31 W |
| Washington Park Plaza | Locale | 193 | Cook | 41 34 00 N | 087 38 03 W |
| Washington Park Plaza | Locale | 181 | Cook | 41 48 09 N | 087 36 24 W |
| Washington Park Pool | Locale | 233 | Tazewell | 40 42 49 N | 089 25 07 W |
| Washington Park Race Track | Locale | 181 | Cook | 41 46 55 N | 087 36 39 W |
| Washington Park Racetrack (historical) | Locale | 188 | Cook | 41 34 07 N | 087 38 32 W |
| Washington Post Office | Post Office | 231 | Tazewell | 40 42 10 N | 089 24 19 W |
| Washington Public School (historical) | School | 239 | Boone | 42 15 17 N | 088 50 28 W |
| Washington Public School (historical) | School | 203 | Coles | 39 29 42 N | 088 10 02 W |
| Washington Public School (historical) | School | 225 | Knox | 40 47 54 N | 090 24 01 W |
| Washington Public School (historical) | School | 127 | Madison | 38 42 24 N | 090 09 38 W |
| Washington Road Cemetery | Cemetery | 189 | Whiteside | 41 38 04 N | 089 58 08 W |
| Washington Royal School (historical) | School | 221 | Cook | 41 29 34 N | 087 45 07 W |
| Washington School | School | 150 | Clay | 38 39 51 N | 088 29 00 W |
| Washington School | School | 151 | Clinton | 38 31 47 N | 089 08 33 W |
| Washington School | School | 182 | Cook | 41 46 22 N | 087 38 47 W |
| Washington School | School | 184 | Cook | 41 36 44 N | 087 39 51 W |
| Washington School | School | 192 | Cook | 41 52 58 N | 087 50 50 W |
| Washington School | School | 194 | Cook | 41 53 00 N | 087 49 19 W |
| Washington School | School | 214 | DuPage | 41 46 40 N | 088 08 54 W |
| Washington School | School | 224 | DuPage | 41 48 00 N | 088 00 23 W |
| Washington School | School | 236 | DuPage | 41 53 11 N | 088 12 21 W |
| Washington School | School | 137 | Franklin | 37 59 43 N | 088 56 26 W |
| Washington School | School | 125 | Jackson | 37 46 04 N | 089 19 36 W |
| Washington School | School | 188 | Kankakee | 41 06 28 N | 087 52 21 W |
| Washington School | School | 157 | La Salle | 41 19 47 N | 089 05 56 W |
| Washington School | School | 157 | Lawrence | 38 41 14 N | 087 46 07 W |
| Washington School | School | 107 | Massac | 37 09 00 N | 088 43 53 W |
| Washington School | School | 282 | McHenry | 42 25 09 N | 088 37 18 W |
| Washington School | School | 183 | Peoria | 40 41 48 N | 089 36 26 W |
| Washington School | School | 160 | St. Clair | 38 30 33 N | 089 58 42 W |
| Washington School | School | 183 | Vermilion | 40 07 47 N | 087 38 06 W |
| Washington School (historical) | School | 171 | Adams | 39 51 39 N | 091 19 19 W |
| Washington School (historical) | School | 219 | Adams | 39 59 36 N | 091 18 02 W |
| Washington School (historical) | School | 224 | Adams | 40 02 27 N | 091 02 59 W |
| Washington School (historical) | School | 189 | Adams | 40 08 22 N | 091 12 29 W |
| Washington School (historical) | School | 209 | Adams | 40 09 51 N | 090 56 43 W |
| Washington School (historical) | School | 194 | Brown | 39 51 18 N | 090 43 16 W |
| Washington School (historical) | School | 195 | Carroll | 42 06 53 N | 090 07 26 W |
| Washington School (historical) | School | 165 | Clark | 39 18 07 N | 087 39 23 W |
| Washington School (historical) | School | 180 | Clark | 39 15 10 N | 087 53 48 W |
| Washington School (historical) | School | 176 | Cook | 41 53 28 N | 087 39 04 W |
| Washington School (historical) | School | 190 | Cumberland | 39 14 51 N | 088 02 00 W |
| Washington School (historical) | School | 206 | DuPage | 41 52 58 N | 087 57 56 W |
| Washington School (historical) | School | 212 | DuPage | 41 53 14 N | 087 55 47 W |
| Washington School (historical) | School | 180 | Fayette | 39 04 20 N | 089 09 27 W |
| Washington School (historical) | School | 229 | Fulton | 40 38 38 N | 090 02 51 W |
| Washington School (historical) | School | 193 | Fulton | 40 19 37 N | 090 18 53 W |
| Washington School (historical) | School | 156 | Greene | 39 14 25 N | 090 14 04 W |
| Washington School (historical) | School | 196 | Hancock | 40 35 27 N | 091 02 32 W |
| Washington School (historical) | School | 200 | Hancock | 40 23 47 N | 091 18 10 W |
| Washington School (historical) | School | 206 | Hancock | 40 12 24 N | 091 00 29 W |
| Washington School (historical) | School | 195 | Iroquois | 40 47 05 N | 087 51 50 W |
| Washington School (historical) | School | 193 | Jersey | 39 08 18 N | 090 28 09 W |
| Washington School (historical) | School | 237 | Knox | 41 04 43 N | 090 20 34 W |
| Washington School (historical) | School | 156 | La Salle | 41 19 57 N | 088 42 51 W |
| Washington School (historical) | School | 147 | La Salle | 41 20 49 N | 088 49 56 W |
| Washington School (historical) | School | 197 | Macoupin | 39 11 42 N | 089 50 28 W |
| Washington School (historical) | School | 203 | Macoupin | 39 28 42 N | 089 54 40 W |
| Washington School (historical) | School | 187 | Macoupin | 39 22 05 N | 090 07 21 W |
| Washington School (historical) | School | 111 | Massac | 37 09 36 N | 088 37 51 W |
| Washington School (historical) | School | 275 | McHenry | 42 28 50 N | 088 15 46 W |
| Washington School (historical) | School | 237 | McLean | 40 21 07 N | 088 45 29 W |
| Washington School (historical) | School | 238 | Rock Island | 41 20 58 N | 090 29 23 W |
| Washington School (historical) | School | 204 | Schuyler | 40 07 08 N | 090 52 25 W |
| Washington School (historical) | School | 125 | St. Clair | 38 36 51 N | 090 09 41 W |
| Washington School (historical) | School | 149 | Tazewell | 40 40 12 N | 089 33 40 W |