| Chemung, Illinois | |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Illinois#USA |
| Pushpin Label Position: | bottom |
| Pushpin Label: | Chemung |
| Coordinates: | 42.4153°N -88.6667°W |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | McHenry |
| Subdivision Type3: | Townships |
| Subdivision Name3: | Chemung, Dunham |
| Elevation M: | 273 |
| Elevation Ft: | 896 |
| Timezone1: | CST |
| Utc Offset1: | -6 |
| Timezone1 Dst: | CDT |
| Utc Offset1 Dst: | -5 |
| Postal Code Type: | ZIP Code(s) |
| Postal Code: | 60033 |
| Blank Name: | FIPS code |
| Blank Info: | 17-12879 |
| Blank1 Name: | GNIS feature ID |
| Blank2 Name Sec2: | Wikimedia Commons |
| Blank2 Info Sec2: | Chemung, Illinois |
| Population As Of: | 2020 |
| Population Total: | 276 |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.73 |
| Area Total Sq Mi: | 0.28 |
| Area Land Km2: | 0.73 |
| Area Water Km2: | 0.00 |
| Area Land Sq Mi: | 0.28 |
| Area Water Sq Mi: | 0.00 |
| Population Density Sq Mi: | 982.21 |
| Population Density Km2: | 379.10 |
Chemung, elevation 896abbr=offNaNabbr=off, is an unincorporated census-designated place in McHenry County, Illinois, United States. Per the 2020 census, the population was 276.[2]
A post office called Chemung was established in 1845, and remained in operation until it was discontinued in 1943.[3] The name Chemung is said to be a Native American word meaning "big horn" after a large horned fossil was discovered in a nearby river.[4]
The small, unincorporated town is located approximately 3.14 miles west of downtown Harvard, Illinois at the junction of Illinois Route 173, Oak Grove Road (County Highway A-20) and Island Road (the continuation of Oak Grove Road south of Route 173). The town straddles the boundary shared by Chemung Township and Dunham Township. In terms of geographic coordinates, Chemung is located at 42.4153°N -88.6667°W (42.4152964, -88.6667668) [5] In terms of the Public Land Survey System, Chemung is found in Sections 4 and 5, Township 45 North, Range 5 East; and Sections 32 and 33, Township 46 North, Range 5 East of the Third Principal Meridian. Piscasaw Creek flows along the west side of Chemung in a generally northeast to southwest direction,[6] and a freight branch line of the Union Pacific Railroad traverses the town in an east-northeast to west-southwest direction.[7] Chemung is served by the Harvard post office. Chemung has an area of 0.28mi2, all land.
Chemung first appeared as a census designated place in the 2010 U.S. Census.
| White alone (NH) | 241 | style='background: #ffffe6; | 179 | 78.25% | style='background: #ffffe6; | 64.86% | |
| Black or African American alone (NH) | 12 | style='background: #ffffe6; | 0 | 3.90% | style='background: #ffffe6; | 0.00% | |
| Native American or Alaska Native alone (NH) | 0 | style='background: #ffffe6; | 0 | 0.00% | style='background: #ffffe6; | 0.00% | |
| Asian alone (NH) | 0 | style='background: #ffffe6; | 0 | 0.00% | style='background: #ffffe6; | 0.00% | |
| Pacific Islander alone (NH) | 0 | style='background: #ffffe6; | 0 | 0.00% | style='background: #ffffe6; | 0.00% | |
| Some Other Race alone (NH) | 0 | style='background: #ffffe6; | 1 | 0.00% | style='background: #ffffe6; | 0.36% | |
| Mixed Race or Multi-Racial (NH) | 6 | style='background: #ffffe6; | 63 | 0.65% | style='background: #ffffe6; | 2.17% | |
| Hispanic or Latino (any race) | 53 | style='background: #ffffe6; | 90 | 17.21% | style='background: #ffffe6; | 32.61% | |
| Total | 308 | style='background: #ffffe6; | 276 | 100.00% | style='background: #ffffe6; | 100.00% |