| Official Name: | Washington Township Marion County |
| Settlement Type: | Township |
| Image Alt: | Castleton Square, the largest mall in Indiana. |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Marion |
| Government Type: | Indiana township |
| Named For: | George Washington |
| Area Total Km2: | 128.6 |
| Area Land Km2: | 125.7 |
| Area Water Km2: | 2.9 |
| Area Total Sq Mi: | 49.7 |
| Area Land Sq Mi: | 48.5 |
| Area Water Sq Mi: | 1.1 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 138678 |
| Population Density Km2: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation M: | 218 |
| Elevation Ft: | 715 |
| Coordinates: | 39.8697°N -86.1442°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-80792[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0454005[3] |
| Website: | http://www.washtwp.org/ |
Washington Township is one of the nine townships of Marion County, Indiana, located in the northern part of the county. The township is entirely within the city of Indianapolis. The population as of the 2020 census was 138,678, up from 132,049 at the 2010 census.[4] The first settlement at Washington Township was made in 1819.[5]
On January 1, 2007, the Washington Township Fire Department became the first township fire department in Marion County to consolidate into the Indianapolis Fire Department as part of Indianapolis Mayor Bart Peterson's proposed Indy Works government cost-savings plan, even though Indy Works, which included merging of Marion County fire departments as part of its cost saving efforts, failed to pass in the City-County Council.