Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Population over time
Brooklyn had 649 residents in the 2020 census, down 4% since 2000.
It’s the 802nd largest of 1,450 towns in Illinois by population.
St. Clair County grew from 86,685 residents in 1900 to 257,400 in 2020.
St. Clair County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Weather by month
Average highs peak around 90°F in summer, and winter lows average 24°F. About 43.4 inches of rain and melted snow fall in a typical year, with about 11 inches of snow.
Source: NOAA 1991–2020 climate normals, Belleville Siu Rsch, IL weather station (9 miles away).
Jobs in St. Clair County
72,871 jobs at 4,973 businesses in St. Clair County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2022 (private employers; jobs counted where people work).
Health care
Nearest hospitals
Memorial HospitalGeneral hospital · emergency room · CMS rating 5 of 5 · Belleville7.8 miles
Hshs St. Elizabeth's HospitalGeneral hospital · emergency room · CMS rating 4 of 5 · O Fallon10.2 miles
Public schools here are run by Brooklyn UD 188. Check each district’s attendance zones for a specific address.
Public schools(3)
School
Grades
Students
Type
Distance
Lovejoy Elementary SchoolLovejoy
Pre-K–5
67
Public
18.1 mi
Lovejoy Middle SchoolLovejoy
6–8
24
Public
18.1 mi
Lovejoy Technology AcademyLovejoy
9–12
27
Public
18.1 mi
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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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.