| Sinclair | |
| Official Name: | Sinclair, Iowa |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | USA Iowa |
| Pushpin Map Caption: | Location within the state of Iowa |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Iowa |
| Subdivision Type2: | County |
| Subdivision Name2: | Butler |
| Unit Pref: | Imperial |
| Population As Of: | 2000 |
| Population Total: | 12 |
| Population Density Km2: | auto |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Coordinates: | 42.5°N -92.7319°W |
| Postal Code Type: | ZIP codes |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 464746 |
Sinclair is an unincorporated community in Butler County, Iowa, United States.
Sinclair was a frequent stop for the Underground Railroad during and before the Civil War. Prior to the establishment of the town, it was nothing more than a railroad stop. Throughout its history, the town has had periods of expansion and periods of struggle. During the Great Depression, the town of Sinclair and the small population suffered greatly. Sinclair's population was 12 in 1925.[1]
On May 25, 2008, an EF5 tornado ripped through southern Butler County, and destroyed the Sinclair grain elevator, ripping apart grain bins and throwing anhydrous ammonia tanks into fields.