Founded in 1836, Ogle County is one of 102 counties in the state of Illinois. Historically, Ogle County was formed from Jo Daviess. The city of Oregon is the county seat. With FIPS code of 141, Ogle County has a population of 51,449 and area of 758 square miles (1,963 km2).
List of all cities in Ogle County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Baileyville, IL | 61007 | 815/779 |
| Brookville, IL | 61064 | 815/779 |
| Byron, IL | 61010 | 815/779 |
| Chana, IL | 61015 | 815/779 |
| Creston, IL | 60113 | 815/779 |
| Davis Junction, IL | 61020 | 815/779 |
| Egan, IL | 61047 | 815/779 |
| Flag Center, IL | 61068 | 815/779 |
| Flagg, IL | 61068 | 815/779 |
| Forreston, IL | 61030 | 815/779 |
| Haldane, IL | 61030 | 815/779 |
| Hillcrest, IL | 61068 | 815/779 |
| Holcomb, IL | 61043 | 815/779 |
| Honey Creek, IL | 61015 | 815/779 |
| Kings, IL | 61068 | 815/779 |
| Leaf River, IL | 61047 | 815/779 |
| Lindenwood, IL | 61049 | 815/779 |
| Monroe Center, IL | 61052 | 815/779 |
| Mount Morris, IL | 61054 | 815/779 |
| Oregon, IL | 61061 | 815/779 |
| Paynes Point, IL | 61015 | 815/779 |
| Polo, IL | 61064 | 815/779 |
| Rochelle, IL | 61068 | 815/779 |
| Stillman Valley, IL | 61084 | 815/779 |
| Stratford, IL | 61064 | 815/779 |
| Woosung, IL | 61091 | 815/779 |