| Foster Township | |
| Settlement Type: | Township |
| Image Map1: | Illinois in United States (US48).svg |
| Map Caption1: | Location of Illinois in the United States |
| Coordinates: | 38.7833°N -147°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Marion |
| Established Title: | Settled |
| Established Date: | November 4, 1873 |
| Leader Title: | Mayor |
| Leader Title1: | Supervisor |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 35.55 |
| Area Land Sq Mi: | 35.51 |
| Area Water Sq Mi: | 0.04 |
| Elevation Ft: | 535 |
| Population As Of: | 2010 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [1] |
| Population Est: | 371 |
| Population Density Sq Mi: | 10.7 |
| Timezone1: | CST |
| Utc Offset1: | -6 |
| Timezone1 Dst: | CDT |
| Utc Offset1 Dst: | -5 |
| Blank Name: | FIPS code |
| Blank Info: | 17-121-27195 |
| Blank2 Name Sec2: | Wikimedia Commons |
| Website: | Geocities |
As of the 2010 census, its population was 379 and it contained 193 housing units.[2] Foster Township is mainly a farming community with corn, wheat and soy beans being the major crop. It no longer has towns or villages within its boundaries.
Foster Township (T4N R2E) is located in Marion County, Illinois. It is centered at 38°47'N 88°59'W (38.783, -88.981). It is located in the northern part of Marion County, bordering Fayette County on its north, and the townships of Kinmundy to its east, Tonti on its south, and Patoka to its west.
Wildlife includes deer, turkey, rabbits and raccoons and an occasional coyote or bobcat. The township consists of flat prairie on the north and west and timber and hills in the south and east.
According to the 2010 census, the township has a total area of, of which (or 99.89%) is land and (or 0.11%) is water.[2]
There are nine cemeteries in the township: