McClellan Township is one of sixteen townships in Jefferson County, Illinois, USA. As of the 2020 census, its population was 1,269 and it contained 546 housing units.

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Town numbers

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Living in McClellan

Health in McClellan

C⁺

Health Grade C+

Healthier than 41% of U.S. towns on seven CDC estimates.

Compared with Illinois

1better than IL·9worse

of 32 measures CDC estimates. The other 22 are too close to call.

Conditions 7▼ 5 close Habits 1▼ 3 close Care 1▲ 6 close Mind 1▼ 4 close Everyday needs all close

BetterToo close to callWorse

What stands out

7.7%Fewer uninsured adultsIL 9.9% · better 8.7%More adults with COPDIL 6.3% · worse

Care nearby

Good Samaritan Regional Hlth CenterMount Vernon · 3.8 mi · ER

Mt. Vernon Health & Wellness CenterMount Vernon · 4.1 mi · sliding-scale fees

Primary careShortage · county-wide

DentalShortage · county-wide

Mental healthShortage · county-wide

CDC PLACES 2025 · modeled estimates for adults · ZIP codes 62864, 62894, 62816 · CMS · HRSAHealth in McClellan →

Natural hazards in McClellan

High

Expected storm and flood damage is higher than in 64% of U.S. communities.

🏚️ Earthquakes🌊 Inland flooding🌪️ Tornadoes

0Does McClellan flood?no paid flood claims on record NoneDisasters that paid out hereof 3 declared for Jefferson County MapMcClellan vs. its neighborsnearby towns shaded by rating

FEMA National Risk Index December 2025 · OpenFEMANatural hazards in McClellan →

Climate in McClellan

Full climate →

McClellan has chilly winters and warm summers. A typical July afternoon reaches 88°, a January night drops to 23°, and about 8 inches of snow falls in a normal winter.

43° / 26°Winter

66° / 45°Spring

86° / 65°Summer

68° / 46°Fall

How much snow does McClellan get?About 8 inches a winter.Rain & snow →When is the first frost?Around Oct 22, with the last in spring around Apr 11.Frost dates →Is it warmer than it used to be?+0.6° vs. the 20th century.Then & now →

NOAA U.S. Climate Normals, 1991–2020Climate in McClellan →

Schools in McClellan

All McClellan schools →

C⁺

School Grade C+

The public schools McClellan’s kids attend, from kindergarten through graduation, trail 61% of Illinois’s districts on state tests and graduation. Among towns with similar incomes, they sit near the middle.

DistrictMt Vernon Twp HSD 201Schools3

McClellan Elementary School A-Elementary · Grades K–8 · 56 students Mount Vernon High School CHigh · Grades 9–12 · 1,233 students Mt Vernon Area Career CenterHigh · Grades 11–12

School data from the U.S. Department of Education (NCES, EDFacts). The School Grade is our own summary of state test results and graduation rates, graded within IL. Ratings are from neighbors.