O'Fallon Township is located in St. Clair County, Illinois. As of the 2010 census, its population was 26,053 and it contained 10,338 housing units.[2]
O'Fallon Township | |
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Township | |
![]() Location in St. Clair County | |
![]() St. Clair County's location in Illinois | |
Country | ![]() |
State | ![]() |
County | ![]() |
Established | November 6, 1883 |
Area | |
• Total | 35.78 sq mi (92.7 km2) |
• Land | 35.12 sq mi (91.0 km2) |
• Water | 0.66 sq mi (1.7 km2) 1.84% |
Population (2010) | |
• Total | 26,467 |
• Estimate (2018)[1] | 29,484 |
• Density | 741.9/sq mi (286.4/km2) |
Time zone | UTC-6 (CST) |
• Summer (DST) | UTC-5 (CDT) |
FIPS code | 17-163-55262 |
According to the 2010 census, the township has a total area of 35.78 square miles (92.7 km2), of which 35.12 square miles (91.0 km2) (or 98.16%) is land and 0.66 square miles (1.7 km2) (or 1.84%) is water.[2]
Historical population | |||
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Census | Pop. | %± | |
2016 (est.) | 26,281 | [1] | |
U.S. Decennial Census[3] |
Municipalities and communities of St. Clair County, Illinois, United States | ||
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County seat: Belleville | ||
Cities | ![]() | |
Villages | ||
Townships | ||
CDPs |
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Other unincorporated communities | ||
Footnotes | ‡This populated place also has portions in an adjacent county or counties | |
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