• county
  • FIPS 17125
  • Largest town: Havana

Mason County, Illinois

Mason County had 12,543 residents in the Census Vintage 2024 estimate, on 539.4 square miles of land. It ranks 82nd of 102 in Illinois by population and 48th by land area.

Population
12,543
#82 of 102 in Illinois · #2,252 in US
Area
539.4 sq mi
#48 of 102 in Illinois · #1,940 in US
Density
23 / sq mi
#86 of 102 in Illinois · #2,121 in US
Median household income
$62,146
#73 of 102 in Illinois · #1,628 in US

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

Mason County within Illinois. Pin: Springfield.

Measure from here

Tools and pages that start from Mason County

Mason County population, land area and income

Mason County had 12,543 residents in the Census Vintage 2024 estimate, on 539.4 square miles of land. It ranks 82nd of 102 in Illinois by population and 48th by land area. That works out to 23.3 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; Mason County is somewhat smaller.

Its SAIPE 2023 median household income of $62,146 is below the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

12,543

3144th1st

2252nd of 3,144 (US)

Land area

539 sq mi

3144th1st

1940th of 3,144 (US)

Density

23.3 / sq mi

3144th1st

2121st of 3,144 (US)

Median household income

$62,146

3143rd1st

1628th of 3,143 (US)

Rank within Illinois (102)

Population

12,543

102nd1st

82nd of 102 (IL)

Land area

539 sq mi

102nd1st

48th of 102 (IL)

Density

23.3 / sq mi

102nd1st

86th of 102 (IL)

Median household income

$62,146

102nd1st

73rd of 102 (IL)

How Mason County's population changed since 2020

Mason County lost 510 residents between the July 2020 and July 2024 estimates, a drop of 3.9%. That ranks 95th 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, Mason County recorded 499 births and 889 deaths, a natural change of -390. Net international migration added +19 and net domestic migration, people moving to or from other US counties, came to -163. The largest single component was natural change, which removed 390 people.

13.1k202012.8k202112.7k202212.6k202312.5k2024
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
499
Deaths
889
Net international migration
+19
Net domestic migration
-163
Change, July 2023 to July 2024
-45

Where Mason County is

The Census internal point of Mason County is at 40.237000, -89.913600. 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 Mason 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: Mason County internal point. Dark pin: Springfield.

Internal point

Decimal
40.237000, -89.913600
DMS
40°14'13.20"N 89°54'48.96"W
UTM
16N 252140.0E 4458135.2N
Geohash
dp0hcuyvt
Plus code
86GG63PP+RH

Towns in Mason County

3 incorporated places of 1,000+ people have residents in Mason County, 6,296 people together, or 50% of the county. Each figure counts only the part of the town inside Mason County; towns marked "part" extend into another county. The largest is Havana with 2,826.

  1. 01Havana2,826
  2. 02Mason City1,982
  3. 03Manito1,488
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Mason County

The Census 2024 county adjacency file lists 6 neighbors for Mason County. The most populous is Tazewell County, IL, with 129,821 residents. Distances run between Census internal points in a straight line.

Distance to Springfield and the nearest big city

Springfield is 34.5 miles SSE of Mason County's internal point in a straight line. The nearest place of 100,000 or more is Springfield, IL (population 112,949), 33.9 miles away. The nearest place of 10,000 or more is Canton, IL (population 12,896), 23.5 miles away.

Mason County FIPS code

The FIPS code of Mason County is 17125: state code 17 for Illinois plus county code 125. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $62,146.

Questions people ask

What is the population of Mason County, Illinois?

The Census Vintage 2024 estimate for July 1, 2024 is 12,543. That is down 510 people (3.9%) from the July 2020 estimate of 13,053.

What is the FIPS code of Mason County?

17125. The first two digits (17) are Illinois; the last three (125) identify the county.

What is the largest town in Mason County?

Havana, with 2,826 residents inside Mason County in 2024.

Which counties border Mason County?

6 county-equivalents border it in the Census 2024 adjacency file: Tazewell County, IL; Fulton County, IL; Logan County, IL; Cass County, IL; Menard 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.