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Riley, Illinois
Riley, Illinois is located in Illinois
Riley, Illinois
Riley, Illinois
Location in Illinois
Riley, Illinois is located in the United States
Riley, Illinois
Riley, Illinois
Location in the United States
Country United States
State Illinois
County McHenry
 • Total 0.18 sq mi (0.46 km2)
 • Land 0.18 sq mi (0.46 km2)
 • Water 0.00 sq mi (0.00 km2)
807 ft (246 m)
 • Total 10
 • Density 56.50/sq mi (21.80/km2)
Time zone UTC-6 (Central (CST))
 • Summer (DST) UTC-5 (CDT)
Area code(s) 815 & 779
GNIS feature ID 423120

Riley, elevation 807 feet (246 m), is an unincorporated community and census-designated place in McHenry County, Illinois, United States. It was named a CDP prior to the 2020 census which showed a population of 10.


The community is located on the north side of the junction of Anthony Road, which runs east-west and Riley Road, which runs north-south. Both of these are Riley Township highways. In terms of geographic coordinates, the community is located at 42°11′29″N 88°37′57″W / 42.19139°N 88.63250°W / 42.19139; -88.63250 (42.1914123, -88.6325924). In terms of the Public Land Survey System, Riley is found in the Northeast Quarter of Section 22, Township 43 North, Range 5 East of the Third Principal Meridian. The main branch of Coon Creek flows to the west of the community in a generally southeast to northwest direction, and a minor branch of the same creek flows from east to west to the north of the community. Riley is served by the Marengo, Illinois 60152 post office.

Points of interest

Riley Community Consolidated (K-8) School, District #18, 9406 Riley Road; the Riley Center Memorial Cemetery; old Riley Township Hall; and the Riley Township War Memorial.


Historical population
Census Pop.
2020 10
U.S. Decennial Census

2020 census

Riley CDP, Illinois - Demographic Profile
(NH = Non-Hispanic)
Race / Ethnicity Pop 2020 % 2020
White alone (NH) 8 80.00%
Black or African American alone (NH) 0 0.00%
Native American or Alaska Native alone (NH) 0 0.00%
Asian alone (NH) 0 0.00%
Pacific Islander alone (NH) 0 0.00%
Some Other Race alone (NH) 0 0.00%
Mixed Race/Multi-Racial (NH) 1 10.00%
Hispanic or Latino (any race) 1 10.00%
Total 10 100.00%

Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos can be of any race.

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