| General Information | |
|---|---|
| Country | United States |
| State/Province | Illinois |
| Major City | Naperville |
| Time Zone | Central (UTC-06:00) |
| Current Local Time | 08:55 |
| Prefix | County | Primary City |
|---|---|---|
| 630-200 | Dupage | Naperville |
| 630-201 | Dupage | Naperville |
| 630-202 | Cook | Brookfield |
| 630-203 | Dupage | Wood Dale |
| 630-204 | Cook | Glenview |
| 630-205 | Cook | Glenview |
| 630-206 | Dupage | West Chicago |
| 630-207 | Cook | Western Springs |
| 630-208 | Kane | Geneva |
| 630-209 | Cook | Western Springs |
| 630-210 | Dupage | Naperville |
| 630-212 | Cook | Prospect Heights |
| 630-213 | Cook | Hanover Park |
| 630-214 | Dupage | Hinsdale |
| 630-215 | Cook | Brookfield |
| 630-216 | Kane | Big Rock |
| 630-217 | Dupage | Medinah |
| 630-218 | Dupage | Hinsdale |
| 630-219 | Dupage | Naperville |
| 630-220 | Dupage | Medinah |
| 630-221 | Dupage | Carol Stream |
| 630-222 | Cook | Chicago |
| 630-223 | Cook | Brookfield |
| 630-224 | Dupage | Naperville |
| 630-225 | Dupage | Warrenville |
| 630-226 | Cook | Lemont |
| 630-227 | Dupage | Bensenville |
| 630-228 | Dupage | Itasca |
| 630-229 | Kane | Aurora |
| 630-230 | Dupage | Hinsdale |
| 630-231 | Dupage | West Chicago |
| 630-232 | Kane | Geneva |
| 630-233 | Cook | Hanover Park |
| 630-234 | Dupage | Winfield |
| 630-235 | Cook | Brookfield |
| 630-236 | Dupage | Aurora |
| 630-237 | Dupage | Roselle |
| 630-238 | Dupage | Bensenville |
| 630-239 | Kane | Mooseheart |
| 630-240 | Cook | Brookfield |
| 630-241 | Dupage | Downers Grove |
| 630-242 | Dupage | Hinsdale |
| 630-243 | Will | Bolingbrook |
| 630-244 | Cook | Prospect Heights |
| 630-245 | Dupage | Naperville |
| 630-246 | Cook | Hanover Park |
| 630-247 | Cook | Western Springs |
| 630-248 | Cook | Brookfield |
| 630-249 | Cook | Brookfield |
| 630-250 | Dupage | Itasca |