• county
  • FIPS 17123
  • Largest town: Henry

Marshall County, Illinois

Marshall County had 11,552 residents in the Census Vintage 2024 estimate, on 386.8 square miles of land. It ranks 84th of 102 in Illinois by population and 74th by land area.

Population
11,552
#84 of 102 in Illinois · #2,312 in US
Area
386.8 sq mi
#74 of 102 in Illinois · #2,581 in US
Density
30 / sq mi
#73 of 102 in Illinois · #1,931 in US
Median household income
$70,246
#37 of 102 in Illinois · #980 in US

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

Marshall County within Illinois. Pin: Springfield.

Measure from here

Tools and pages that start from Marshall County

Marshall County population, land area and income

Marshall County had 11,552 residents in the Census Vintage 2024 estimate, on 386.8 square miles of land. It ranks 84th of 102 in Illinois by population and 74th by land area. That works out to 29.9 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 Marshall County has 47% of the typical county's population.

Its SAIPE 2023 median household income of $70,246 is above the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

11,552

3144th1st

2312th of 3,144 (US)

Land area

387 sq mi

3144th1st

2581st of 3,144 (US)

Density

29.9 / sq mi

3144th1st

1931st of 3,144 (US)

Median household income

$70,246

3143rd1st

980th of 3,143 (US)

Rank within Illinois (102)

Population

11,552

102nd1st

84th of 102 (IL)

Land area

387 sq mi

102nd1st

74th of 102 (IL)

Density

29.9 / sq mi

102nd1st

73rd of 102 (IL)

Median household income

$70,246

102nd1st

37th of 102 (IL)

How Marshall County's population changed since 2020

Marshall County lost 158 residents between the July 2020 and July 2024 estimates, a drop of 1.3%. That ranks 39th 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, Marshall County recorded 443 births and 757 deaths, a natural change of -314. Net international migration added +20 and net domestic migration, people moving to or from other US counties, came to +104. The largest single component was natural change, which removed 314 people.

11.7k202011.7k202111.7k202211.7k202311.6k2024
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
443
Deaths
757
Net international migration
+20
Net domestic migration
+104
Change, July 2023 to July 2024
-98

Where Marshall County is

The Census internal point of Marshall County is at 41.031100, -89.342400. It sits in UTM zone 16N. The map shades Illinois's 102 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Marshall 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: Marshall County internal point. Dark pin: Springfield.

Internal point

Decimal
41.031100, -89.342400
DMS
41°01'51.96"N 89°20'32.64"W
UTM
16N 303085.5E 4544852.7N
Geohash
dp23qvqz7
Plus code
86HG2MJ5+C2

Towns in Marshall County

4 incorporated places of 1,000+ people have residents in Marshall County, 5,511 people together, or 48% of the county. Each figure counts only the part of the town inside Marshall County; towns marked "part" extend into another county. The largest is Henry with 2,298.

  1. 01Henry2,298
  2. 02Lacon1,838
  3. 03Toluca1,321
  4. 04Washburn (part)54
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Marshall County

The Census 2024 county adjacency file lists 6 neighbors for Marshall County. The most populous is Peoria County, IL, with 179,630 residents. Distances run between Census internal points in a straight line.

Distance to Springfield and the nearest big city

Springfield is 87.9 miles S of Marshall County's internal point in a straight line. The nearest place of 100,000 or more is Peoria, IL (population 111,696), 24.0 miles away. The nearest place of 10,000 or more is Washington, IL (population 15,857), 22.9 miles away.

Marshall County FIPS code

The FIPS code of Marshall County is 17123: state code 17 for Illinois plus county code 123. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $70,246.

Questions people ask

What is the population of Marshall County, Illinois?

The Census Vintage 2024 estimate for July 1, 2024 is 11,552. That is down 158 people (1.3%) from the July 2020 estimate of 11,710.

What is the FIPS code of Marshall County?

17123. The first two digits (17) are Illinois; the last three (123) identify the county.

What is the largest town in Marshall County?

Henry, with 2,298 residents inside Marshall County in 2024.

Which counties border Marshall County?

6 county-equivalents border it in the Census 2024 adjacency file: Peoria County, IL; LaSalle County, IL; Woodford County, IL; Bureau County, IL; Putnam County, IL; Stark 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.