• county
  • FIPS 17093
  • Largest town: Oswego

Kendall County, Illinois

Kendall County had 143,171 residents in the Census Vintage 2024 estimate, on 320.2 square miles of land. It ranks 14th of 102 in Illinois by population and 89th by land area.

Population
143,171
#14 of 102 in Illinois · #475 in US
Area
320.2 sq mi
#89 of 102 in Illinois · #2,761 in US
Density
447 / sq mi
#8 of 102 in Illinois · #316 in US
Median household income
$114,606
#1 of 102 in Illinois · #48 in US

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

Kendall County within Illinois. Pin: Springfield.

Measure from here

Tools and pages that start from Kendall County

Kendall County population, land area and income

Kendall County had 143,171 residents in the Census Vintage 2024 estimate, on 320.2 square miles of land. It ranks 14th of 102 in Illinois by population and 89th by land area. That works out to 447.1 people per square mile, 4.6 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in Illinois has 24,447 residents, so Kendall County is 5.9 times that size.

Its SAIPE 2023 median household income of $114,606 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

143,171

3144th1st

475th of 3,144 (US)

Land area

320 sq mi

3144th1st

2761st of 3,144 (US)

Density

447.1 / sq mi

3144th1st

316th of 3,144 (US)

Median household income

$114,606

3143rd1st

48th of 3,143 (US)

Rank within Illinois (102)

Population

143,171

102nd1st

14th of 102 (IL)

Land area

320 sq mi

102nd1st

89th of 102 (IL)

Density

447.1 / sq mi

102nd1st

8th of 102 (IL)

Median household income

$114,606

102nd1st

1st of 102 (IL)

How Kendall County's population changed since 2020

Kendall County gained 10,820 residents between the July 2020 and July 2024 estimates, a rise of 8.2%. That ranks 1st 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, Kendall County recorded 6,406 births and 3,231 deaths, a natural change of +3,175. Net international migration added +1,452 and net domestic migration, people moving to or from other US counties, came to +6,681. The largest single component was domestic migration, which added 6,681 people.

132.4k2020135.0k2021137.6k2022140.2k2023143.2k2024
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
6,406
Deaths
3,231
Net international migration
+1,452
Net domestic migration
+6,681
Change, July 2023 to July 2024
+2,942

Where Kendall County is

The Census internal point of Kendall County is at 41.588100, -88.430600. 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 Kendall 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: Kendall County internal point. Dark pin: Springfield.

Internal point

Decimal
41.588100, -88.430600
DMS
41°35'17.16"N 88°25'50.16"W
UTM
16N 380758.6E 4605033.3N
Geohash
dp3hedyu1
Plus code
86HHHHQ9+6Q

Towns in Kendall County

9 incorporated places of 1,000+ people have residents in Kendall County, 115,400 people together, or 81% of the county. Each figure counts only the part of the town inside Kendall County; towns marked "part" extend into another county. The largest is Oswego with 38,778.

  1. 01Oswego38,778
  2. 02Yorkville25,986
  3. 03Joliet (part)14,461
  4. 04Plano12,677
  5. 05Montgomery (part)12,374
  6. 06Aurora (part)6,431
  7. 07Plainfield (part)3,371
  8. 08Minooka (part)1,156
  9. 09Sandwich (part)166
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Kendall County

The Census 2024 county adjacency file lists 6 neighbors for Kendall County. The most populous is DuPage County, IL, with 937,142 residents. Distances run between Census internal points in a straight line.

Distance to Springfield and the nearest big city

Springfield is 140.3 miles SSW of Kendall County's internal point in a straight line. The nearest place of 100,000 or more is Aurora, IL (population 180,710), 14.1 miles away. The nearest place of 10,000 or more is Yorkville, IL (population 25,986), 5.1 miles away.

Kendall County FIPS code

The FIPS code of Kendall County is 17093: state code 17 for Illinois plus county code 093. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $114,606.

Questions people ask

What is the population of Kendall County, Illinois?

The Census Vintage 2024 estimate for July 1, 2024 is 143,171. That is up 10,820 people (8.2%) from the July 2020 estimate of 132,351.

What is the FIPS code of Kendall County?

17093. The first two digits (17) are Illinois; the last three (093) identify the county.

What is the largest town in Kendall County?

Oswego, with 38,778 residents inside Kendall County in 2024.

Which counties border Kendall County?

6 county-equivalents border it in the Census 2024 adjacency file: DuPage County, IL; Will County, IL; Kane County, IL; LaSalle County, IL; DeKalb County, IL; Grundy 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.