| Official Name: | Union Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Fayette |
| Area Total Km2: | 87.2 |
| Area Land Km2: | 87.2 |
| Area Water Km2: | 0 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 33.67 |
| Area Land Sq Mi: | 33.67 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2010 |
| Population Total: | 412 |
| Population Density Km2: | auto |
| Elevation M: | 343 |
| Elevation Ft: | 1125 |
| Coordinates: | 42.9536°N -91.7872°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 52135, 52141, 52142, 52175 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0468820 |
Union Township is one of twenty townships in Fayette County, Iowa, United States. As of the 2010 census, its population was 412.[1]
It was previously called West Union township.
According to the United States Census Bureau, Union Township covers an area of 33.67 square miles (87.2 square kilometers).
The city of West Union is entirely within this township geographically but is a separate municipality.
The township contains these five cemeteries: Barnhouse, Butler, Mount Calvary, Mount Pleasant and Pleasant Grove.