| Official Name: | Lewis Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Clay |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 44.22 |
| Area Land Sq Mi: | 44.05 |
| Area Water Sq Mi: | 0.17 |
| Population As Of: | 2020 |
| Population Total: | 1373 |
| Population Density Sq Mi: | auto |
| Elevation Footnotes: | [1] |
| Elevation M: | 167 |
| Elevation Ft: | 548 |
| Coordinates: | 39.2225°N -87.1897°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-43002[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453548 |
Lewis Township is one of eleven townships in Clay County, Indiana. As of the 2020 census, its population was 1,373 (down from 1,464 at 2010[3]) and it contained 613 housing units.[4]
Lewis Township was organized in the 1840s. It was named for Lewis Cass.[5]
Elijah Rawley was one of the first settlers in what became Lewis Township, arriving in about 1823, and built a mill on the Eel River near "Old Hill."[6] Thus "Old Hill" or "The Old Hill" is among the oldest settled points on the Eel River.(21 July 1889). News of the Neighborhood, Daily Wabash Express In fact, according to a 1902 article, when the county was organized in 1825, " 'The Old Hill' was the most frequented and noted point within its borders."[7] From 1848 until 1853, a Carrithers Township existed, and the voting place was at Rawley's, at the intersection of current County Roads 525W and 600 South.[8]
According to the 2010 census, the township has a total area of, of which (or 99.62%) is land and (or 0.38%) is water.[3]
(This list is based on USGS data and may include former settlements.)