| Unit Pref: | Imperial |
| Settlement Type: | Township |
| Official Name: | Harlem Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Winnebago |
| Leader Title: | Supervisor |
| Leader Name: | Gary Jury |
| Established Title: | Established |
| Area Total Sq Mi: | 33.38 |
| Area Land Sq Mi: | 32.79 |
| Area Water Sq Mi: | 0.59 |
| Area Water Percent: | 1.77 |
| Population As Of: | 2010 |
| Population Density Sq Mi: | 1224.6 |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Coordinates: | 42.3656°N -88.9964°W |
| Elevation Ft: | 817 |
| Footnotes: | [1] |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [2] |
| Population Est: | 39113 |
| Blank Name: | FIPS code |
| Blank Info: | 17-201-32928 |
Harlem Township is located in Winnebago County, Illinois. As of the 2010 census, its population was 40,158 and it contained 16,025 housing units.[3]
According to the 2010 census, the township has a total area of, of which (or 98.23%) is land and (or 1.77%) is water.[3]