• county
  • FIPS 17009
  • Largest town: Mount Sterling

Brown County, Illinois

Brown County had 6,307 residents in the Census Vintage 2024 estimate, on 305.7 square miles of land. It ranks 91st of 102 in Illinois by population and 91st by land area.

Population
6,307
#91 of 102 in Illinois · #2,713 in US
Area
305.7 sq mi
#91 of 102 in Illinois · #2,797 in US
Density
21 / sq mi
#90 of 102 in Illinois · #2,224 in US
Median household income
$76,076
#19 of 102 in Illinois · #624 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Brown County within Illinois. Pin: Springfield.

Measure from here

Tools and pages that start from Brown County

Brown County population, land area and income

Brown County had 6,307 residents in the Census Vintage 2024 estimate, on 305.7 square miles of land. It ranks 91st of 102 in Illinois by population and 91st by land area. That works out to 20.6 people per square mile, below the US average of 96.3, and below the national county median.

The median county-equivalent in Illinois has 24,447 residents, so Brown County has 26% of the typical county's population.

Its SAIPE 2023 median household income of $76,076 is in the top quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

6,307

3144th1st

2713th of 3,144 (US)

Land area

306 sq mi

3144th1st

2797th of 3,144 (US)

Density

20.6 / sq mi

3144th1st

2224th of 3,144 (US)

Median household income

$76,076

3143rd1st

624th of 3,143 (US)

Rank within Illinois (102)

Population

6,307

102nd1st

91st of 102 (IL)

Land area

306 sq mi

102nd1st

91st of 102 (IL)

Density

20.6 / sq mi

102nd1st

90th of 102 (IL)

Median household income

$76,076

102nd1st

19th of 102 (IL)

How Brown County's population changed since 2020

Brown County gained 70 residents between the July 2020 and July 2024 estimates, a rise of 1.1%. That ranks 6th of 102 in Illinois for growth. The median Illinois county changed by -1.7%, and the state as a whole by -0.7%.

Since the April 2020 estimates base, Brown County recorded 227 births and 247 deaths, a natural change of -20. Net international migration added +2 and net domestic migration, people moving to or from other US counties, came to +82. The largest single component was domestic migration, which added 82 people.

6,23720206,44420216,32120226,30120236,3072024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
227
Deaths
247
Net international migration
+2
Net domestic migration
+82
Change, July 2023 to July 2024
+6

Where Brown County is

The Census internal point of Brown County is at 39.962100, -90.750300. It sits in UTM zone 15N. The map shades Illinois's 102 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Brown County outlined. Dots are towns of 1,000+ people with residents in it.

Piatt County: -0.3%Hamilton County: -2.2%Williamson County: -0.1%Edgar County: -2.4%Macoupin County: -2.3%Marshall County: -1.3%Putnam County: +0.0%Richland County: -2.8%Washington County: -1.4%Lee County: -1.5%Douglas County: +0.2%Cook County: -1.6%Effingham County: -0.3%Edwards County: -3.6%Cass County: -2.0%Clay County: -3.4%Knox County: -2.2%LaSalle County: -0.9%Cumberland County: -1.3%Warren County: -3.7%Moultrie County: -0.9%Menard County: -2.5%Fayette County: -1.5%Boone County: -0.0%Lawrence County: -3.2%Marion County: -3.2%Champaign County: +3.0%Clark County: -2.4%Ford County: -0.4%Wayne County: -1.4%Logan County: -1.4%Grundy County: +2.5%Jasper County: -1.8%Crawford County: -1.3%McDonough County: -1.7%Clinton County: +0.5%Perry County: -3.0%Montgomery County: -2.2%Henry County: -2.0%Livingston County: -1.2%Scott County: -3.8%Alexander County: -11.2%Bureau County: -2.2%Brown County: +1.1%Mason County: -3.9%Calhoun County: -4.1%Greene County: -4.3%Coles County: -1.4%Kendall County: +8.2%Lake County: +0.7%Mercer County: -2.2%St. Clair County: -2.3%Wabash County: -3.0%Bond County: -1.7%DuPage County: +0.6%Gallatin County: -5.2%Stephenson County: -3.3%McHenry County: +1.9%White County: -3.0%Saline County: -3.9%Christian County: -2.2%Sangamon County: -1.0%Massac County: -3.6%Macon County: -2.9%Johnson County: -0.0%Jo Daviess County: -2.6%Peoria County: -1.0%DeKalb County: +1.0%Pope County: -1.5%De Witt County: -0.9%Schuyler County: -1.7%Fulton County: -3.1%Ogle County: -0.8%Jersey County: -1.6%Iroquois County: -3.3%Kankakee County: -0.9%Rock Island County: -1.1%Pulaski County: -5.8%Kane County: +0.9%Union County: -2.4%Whiteside County: -1.7%Woodford County: -0.3%Carroll County: -1.5%Adams County: -2.3%Hardin County: -2.6%Madison County: -1.0%Hancock County: -3.1%Monroe County: +0.0%Tazewell County: -1.1%Jackson County: -0.1%Vermilion County: -3.9%Randolph County: -0.6%McLean County: +0.5%Morgan County: -2.6%Shelby County: -1.7%Will County: +1.7%Winnebago County: -0.4%Jefferson County: -2.4%Stark County: -2.2%Henderson County: -4.5%Pike County: -2.6%Franklin County: -1.8%
Change 2020 to 2024
  1. < -3.0%
  2. < -2.2%
  3. < -1.4%
  4. < -0.3%
  5. ≥ -0.3%
no data

Orange pin: Brown County internal point. Dark pin: Springfield.

Internal point

Decimal
39.962100, -90.750300
DMS
39°57'43.56"N 90°45'1.08"W
UTM
15N 692148.6E 4425974.3N
Geohash
9zp7qfvsh
Plus code
86FFX66X+RV

Towns in Brown County

One incorporated place of 1,000+ people has residents in Brown County, 2,031 people together, or 32% of the county. Each figure counts only the part of the town inside Brown County; towns marked "part" extend into another county. The largest is Mount Sterling with 2,031.

  1. 01Mount Sterling2,031
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Brown County

The Census 2024 county adjacency file lists 5 neighbors for Brown County. The most populous is Adams County, IL, with 64,109 residents. Distances run between Census internal points in a straight line.

Distance to Springfield and the nearest big city

Springfield is 59.7 miles ESE of Brown County's internal point in a straight line. The nearest place of 100,000 or more is Springfield, IL (population 112,949), 59.8 miles away. The nearest place of 10,000 or more is Jacksonville, IL (population 17,801), 31.9 miles away.

Brown County FIPS code

The FIPS code of Brown County is 17009: state code 17 for Illinois plus county code 009. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $76,076.

Questions people ask

What is the population of Brown County, Illinois?

The Census Vintage 2024 estimate for July 1, 2024 is 6,307. That is up 70 people (1.1%) from the July 2020 estimate of 6,237.

What is the FIPS code of Brown County?

17009. The first two digits (17) are Illinois; the last three (009) identify the county.

What is the largest town in Brown County?

Mount Sterling, with 2,031 residents inside Brown County in 2024.

Which counties border Brown County?

5 county-equivalents border it in the Census 2024 adjacency file: Adams County, IL; Morgan County, IL; Pike County, IL; Cass County, IL; Schuyler County, IL.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.