| Official Name: | Township of Illinois |
| Settlement Type: | Township |
| Image Map1: | Map of Arkansas highlighting Washington County.svg |
| Mapsize1: | 200px |
| Map Caption1: | Location of Washington County in Arkansas |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Washington |
| Established Title: | Established |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 8.9 |
| Area Land Sq Mi: | 8.9 |
| Area Water Sq Mi: | 0.0 |
| Area Water Percent: | 0 |
| Population As Of: | 2000 |
| Population Total: | 3076 |
| Population Density Sq Mi: | 347 |
| Elevation Ft: | 1240 |
| Coordinates: | 36.1333°N -94.1753°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Area Code: | 479 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 69792 |
Johnson Township is one of thirty-seven townships in Washington County, Arkansas, USA.[1] As of the 2000 census, its total population was 3,076.
According to the United States Census Bureau, Johnson Township covers an area of 8.9sqmi, all land.[1]
The township contains Stuckey Cemetery.