| Flagg | |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | USA Illinois Ogle County#USA Illinois |
| Pushpin Map Caption: | Location within Ogle County |
| Coordinates: | 41.8958°N -89.1408°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Ogle |
| Subdivision Type3: | Township |
| Subdivision Name3: | Flagg |
| Leader Title: | Mayor |
| Elevation Ft: | 781 |
| Population Density Sq Mi: | auto |
| Timezone1: | CST |
| Utc Offset1: | -6 |
| Timezone1 Dst: | CDT |
| Utc Offset1 Dst: | -5 |
| Postal Code Type: | Postal code |
| Postal Code: | 61029 |
| Area Codes: | 815, 779 |
Flagg is an unincorporated community in the southeastern portion of Ogle County in Flagg Township, Illinois, United States. It may be found at the crossroads of Grange and Titus Roads.[1]
Flagg took its name from its location in Flagg Township.[2] The Flagg post office was discontinued in 1917.[3]
In 1936, the Galena and Chicago Union Railroad had a station in Flagg.