• county
  • FIPS 17107
  • Largest town: Lincoln

Logan County, Illinois

Logan County had 27,518 residents in the Census Vintage 2024 estimate, on 618.1 square miles of land. It ranks 49th of 102 in Illinois by population and 33rd by land area.

Population
27,518
#49 of 102 in Illinois · #1,525 in US
Area
618.1 sq mi
#33 of 102 in Illinois · #1,560 in US
Density
45 / sq mi
#52 of 102 in Illinois · #1,579 in US
Median household income
$64,779
#56 of 102 in Illinois · #1,393 in US

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

Logan County within Illinois. Pin: Springfield.

Measure from here

Tools and pages that start from Logan County

Logan County population, land area and income

Logan County had 27,518 residents in the Census Vintage 2024 estimate, on 618.1 square miles of land. It ranks 49th of 102 in Illinois by population and 33rd by land area. That works out to 44.5 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; Logan County is somewhat larger.

Its SAIPE 2023 median household income of $64,779 is above the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

27,518

3144th1st

1525th of 3,144 (US)

Land area

618 sq mi

3144th1st

1560th of 3,144 (US)

Density

44.5 / sq mi

3144th1st

1579th of 3,144 (US)

Median household income

$64,779

3143rd1st

1393rd of 3,143 (US)

Rank within Illinois (102)

Population

27,518

102nd1st

49th of 102 (IL)

Land area

618 sq mi

102nd1st

33rd of 102 (IL)

Density

44.5 / sq mi

102nd1st

52nd of 102 (IL)

Median household income

$64,779

102nd1st

56th of 102 (IL)

How Logan County's population changed since 2020

Logan County lost 387 residents between the July 2020 and July 2024 estimates, a drop of 1.4%. That ranks 40th 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, Logan County recorded 975 births and 1,558 deaths, a natural change of -583. Net international migration added +71 and net domestic migration, people moving to or from other US counties, came to +38. The largest single component was natural change, which removed 583 people.

27.9k202028.0k202127.7k202227.5k202327.5k2024
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
975
Deaths
1,558
Net international migration
+71
Net domestic migration
+38
Change, July 2023 to July 2024
+10

Where Logan County is

The Census internal point of Logan County is at 40.129300, -89.365300. 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 Logan 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: Logan County internal point. Dark pin: Springfield.

Internal point

Decimal
40.129300, -89.365300
DMS
40°07'45.48"N 89°21'55.08"W
UTM
16N 298470.2E 4444790.3N
Geohash
dp0kq3q4j
Plus code
86GG4JHM+PV

Towns in Logan County

3 incorporated places of 1,000+ people have residents in Logan County, 16,187 people together, or 59% of the county. Each figure counts only the part of the town inside Logan County; towns marked "part" extend into another county. The largest is Lincoln with 13,047.

  1. 01Lincoln13,047
  2. 02Atlanta1,634
  3. 03Mount Pulaski1,506
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Logan County

The Census 2024 county adjacency file lists 7 neighbors for Logan County. The most populous is Sangamon County, IL, with 194,345 residents. Distances run between Census internal points in a straight line.

Distance to Springfield and the nearest big city

Springfield is 28.4 miles SSW of Logan County's internal point in a straight line. The nearest place of 100,000 or more is Springfield, IL (population 112,949), 27.7 miles away. The nearest place of 10,000 or more is Lincoln, IL (population 13,047), 1.5 miles away.

Logan County FIPS code

The FIPS code of Logan County is 17107: state code 17 for Illinois plus county code 107. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $64,779.

Questions people ask

What is the population of Logan County, Illinois?

The Census Vintage 2024 estimate for July 1, 2024 is 27,518. That is down 387 people (1.4%) from the July 2020 estimate of 27,905.

What is the FIPS code of Logan County?

17107. The first two digits (17) are Illinois; the last three (107) identify the county.

What is the largest town in Logan County?

Lincoln, with 13,047 residents inside Logan County in 2024.

Which counties border Logan County?

7 county-equivalents border it in the Census 2024 adjacency file: Sangamon County, IL; McLean County, IL; Tazewell County, IL; Macon County, IL; De Witt County, IL; Mason County, IL; Menard 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.