• county
  • FIPS 17063
  • Largest town: Morris

Grundy County, Illinois

Grundy County had 53,835 residents in the Census Vintage 2024 estimate, on 418.1 square miles of land. It ranks 25th of 102 in Illinois by population and 69th by land area.

Population
53,835
#25 of 102 in Illinois · #965 in US
Area
418.1 sq mi
#69 of 102 in Illinois · #2,422 in US
Density
129 / sq mi
#22 of 102 in Illinois · #761 in US
Median household income
$91,254
#8 of 102 in Illinois · #229 in US

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

Grundy County within Illinois. Pin: Springfield.

Measure from here

Tools and pages that start from Grundy County

Grundy County population, land area and income

Grundy County had 53,835 residents in the Census Vintage 2024 estimate, on 418.1 square miles of land. It ranks 25th of 102 in Illinois by population and 69th by land area. That works out to 128.8 people per square mile, 1.3 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in Illinois has 24,447 residents, so Grundy County is 2.2 times that size.

Its SAIPE 2023 median household income of $91,254 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

53,835

3144th1st

965th of 3,144 (US)

Land area

418 sq mi

3144th1st

2422nd of 3,144 (US)

Density

128.8 / sq mi

3144th1st

761st of 3,144 (US)

Median household income

$91,254

3143rd1st

229th of 3,143 (US)

Rank within Illinois (102)

Population

53,835

102nd1st

25th of 102 (IL)

Land area

418 sq mi

102nd1st

69th of 102 (IL)

Density

128.8 / sq mi

102nd1st

22nd of 102 (IL)

Median household income

$91,254

102nd1st

8th of 102 (IL)

How Grundy County's population changed since 2020

Grundy County gained 1,300 residents between the July 2020 and July 2024 estimates, a rise of 2.5%. That ranks 3rd 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, Grundy County recorded 2,277 births and 2,203 deaths, a natural change of +74. Net international migration added +279 and net domestic migration, people moving to or from other US counties, came to +944. The largest single component was domestic migration, which added 944 people.

52.5k202053.0k202153.2k202253.6k202353.8k2024
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
2,277
Deaths
2,203
Net international migration
+279
Net domestic migration
+944
Change, July 2023 to July 2024
+248

Where Grundy County is

The Census internal point of Grundy County is at 41.292400, -88.401100. 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 Grundy 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: Grundy County internal point. Dark pin: Springfield.

Internal point

Decimal
41.292400, -88.401100
DMS
41°17'32.64"N 88°24'3.96"W
UTM
16N 382686.1E 4572163.7N
Geohash
dp34umh39
Plus code
86HH7HRX+XH

Towns in Grundy County

9 incorporated places of 1,000+ people have residents in Grundy County, 38,762 people together, or 72% of the county. Each figure counts only the part of the town inside Grundy County; towns marked "part" extend into another county. The largest is Morris with 14,587.

  1. 01Morris14,587
  2. 02Minooka (part)9,755
  3. 03Coal City (part)5,807
  4. 04Channahon (part)4,521
  5. 05Diamond (part)2,698
  6. 06Gardner1,366
  7. 07Dwight (part)14
  8. 08Seneca (part)9
  9. 09Braidwood (part)5
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Grundy County

The Census 2024 county adjacency file lists 5 neighbors for Grundy County. The most populous is Will County, IL, with 708,583 residents. Distances run between Census internal points in a straight line.

Distance to Springfield and the nearest big city

Springfield is 123.3 miles SSW of Grundy County's internal point in a straight line. The nearest place of 100,000 or more is Joliet, IL (population 151,837), 20.3 miles away. The nearest place of 10,000 or more is Morris, IL (population 14,587), 6.2 miles away.

Grundy County FIPS code

The FIPS code of Grundy County is 17063: state code 17 for Illinois plus county code 063. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $91,254.

Questions people ask

What is the population of Grundy County, Illinois?

The Census Vintage 2024 estimate for July 1, 2024 is 53,835. That is up 1,300 people (2.5%) from the July 2020 estimate of 52,535.

What is the FIPS code of Grundy County?

17063. The first two digits (17) are Illinois; the last three (063) identify the county.

What is the largest town in Grundy County?

Morris, with 14,587 residents inside Grundy County in 2024.

Which counties border Grundy County?

5 county-equivalents border it in the Census 2024 adjacency file: Will County, IL; Kendall County, IL; LaSalle County, IL; Kankakee County, IL; Livingston 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.