Unified School District · IL
Brimfield Community Unit School District 309
Brimfield Community Unit School District 309 is a unified school district in Illinois with a community population of 3,302. The median household income is $110,699 and the median age is 43.7.
3,302
Population
44
People / sq mi
$110,699
Median Income
43.7
Median Age
Brimfield Community Unit School District 309 covers 75 sq mi of land at 43.8 people per square mile.
Race & Ethnicity
| White | 98.0% |
| Black or African American | 0.0% |
| Asian | 59.4% |
| Hispanic or Latino (any race) | 0.0% |
Economy & Income
$110,699
Median Household Income
$55,170
Per Capita Income
4.3%
Poverty Rate
2.1%
Unemployment
Housing
$239,800
Median Home Value
$961
Median Rent
89.1%
Homeownership
Education Attainment
97.0%
High School+
49.0%
Bachelor's+
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Frequently Asked Questions
Brimfield Community Unit School District 309 serves a community with a population of 3,302 according to the latest Census ACS 5-Year estimates. This unified school district is located in Illinois.
The median household income in Brimfield Community Unit School District 309 is $110,699, with a per capita income of $55,170. The poverty rate is 4.3%.
Brimfield Community Unit School District 309 is 98.0% White, 0.0% Black or African American, 59.4% Asian, and 0.0% Hispanic or Latino, per Census ACS data.
In Brimfield Community Unit School District 309, 97.0% of adults have a high school diploma or higher, and 49.0% hold a bachelor's degree or higher, per Census ACS estimates.
The median home value in Brimfield Community Unit School District 309 is $239,800, with a median rent of $961. The homeownership rate is 89.1%.
More from Illinois
Data for Brimfield Community Unit School District 309 from the American Community Survey 5-Year estimates. Land area from Census Gazetteer files. This is a unified school district (GEOID: 1707200).
The this entity record above pulls directly from the U.S. Census Bureau ACS and decennial files. What follows is the per-entity context — how this entity sits in the broader U.S. population demographics distribution and which underlying factors drive the headline numbers.
Every number on this page links back to the U.S. Census Bureau ACS and decennial files; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for this entity’s peers within U.S. states, metros, cities, and ZIPs. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Source: U.S. Census Bureau ACS, 2026.