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Seneca is a township in McHenry County, in the Chicago metro area.
The township was named for the Seneca Indians in New York State.
[NOTE: This is not the only community in Illinois named Seneca. For links to other places called Seneca, IL, see the Duplicate Names box at right.]
The latitude of Seneca is 42.278N. The longitude is -88.527W.It is in the Central Standard time zone. Elevation is 833 feet.
The population, at the time of the 2000 census, was 2,733.
Sections below provide additional information and links about Seneca demographics, travel and tourism, nearby airports, cemeteries, the McHenry County economy, education, environment, genealogy, government, historic sites, libraries, maps, museums, newspapers and other media, nonprofit groups, real estate, recreation, religion, transportation, and weather in the 60180 ZIP code.
25% of Seneca residents report German ancestry, and 14% report Irish. For more info on local ancestry groups, see the Seneca ancestry & family history guide.
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At the time of the 2000 census, the per capita income in Seneca was $31,084, compared with $21,587 nationally.
29% of Seneca residents age 25 and older have a bachelor's or advanced college degree.
Historic districts in Seneca include Woodstock Square Historic District ... View historic districts
Median rent in Seneca, at the time of the 2000 Census, was $760. Monthly homeowner costs, for people with mortgages, were $1,733.
Libraries in Seneca include Marengo Public Library, Woodstock Public Library ... View libraries
McHenry County supported George W. Bush in the 2004 presidential election. For more information, see our Seneca political report.
The average commute time for Seneca workers is 31 minutes, compared with 26 minutes nationwide.
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