Adair is a community in McDonough County, Illinois, home to about 215 people across 0.4 square miles. Its ZIP code is 61411.
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| Nearest major airport | St. Louis Lambert International Airport (STL)113 miles away |
|---|---|
| Closer regional airport | Southeast Iowa Regional Airport (BRL)43 miles away |
| Nearest city of 250,000+ | St. Louis, MO122 miles away |
| Nearest city of 1 million+ | Chicago, IL178 miles away |
Straight-line distances from the center of Adair; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Adair had 212 residents in the 2020 census, up 1% since 2010.
It’s the 1188th largest of 1,450 towns in Illinois by population.
McDonough County grew from 28,412 residents in 1900 to 27,238 in 2020.
McDonough County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 86°F in summer, and winter lows average 16°F. About 38.5 inches of rain and melted snow fall in a typical year, with about 21 inches of snow.
Source: NOAA 1991–2020 climate normals, Prairie City 2s, IL weather station (14 miles away).
8,590 jobs at 611 businesses in McDonough County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
Nearest hospitals
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.