County · Illinois

Grundy County, Illinois

Grundy County, Illinois. Grundy County had 54,052 residents in 2025 by the Census Bureau's estimate, up 2.8% since 2020, while Illinois shrank 0.8%. It holds 34 places (17 cities, villages and boroughs and 17 towns and townships) and 10 census tracts. GEOID 17063.

Grundy County is one of the 13 counties of the Chicago-Naperville-Elgin, IL-IN metropolitan statistical area (the Census Bureau's July 2023 delineation).

Residents, July 2025 estimate

54,052

Census Bureau estimate (no margin published)
2020 Census count: 52,533 · ACS 2020-2024: 53,219

Median household income

$92,235

±$7,255 (90% margin)
Illinois: $83,390

Median home value

$271,700

±$10,409 (90% margin)
Illinois: $263,300

Median gross rent

$1,177

±$59 (90% margin)
Illinois: $1,274

How many people live in Grundy County, and is it growing?

The 2020 Census counted 52,533 residents in Grundy County. The Census Bureau estimates 54,052 for July 1, 2025, up 2.8% since 2020, while Illinois shrank 0.8%. The 2020-2024 American Community Survey puts the population at 53,219 over 418 square miles of land.

July 2020→2021 +454 (52,992)
2021→2022 +153 (53,145)
2022→2023 +405 (53,550)
2023→2024 +171 (53,721)
2024→2025 +331 (54,052)

Grundy County in Illinois. Boundaries: Census Bureau 2024.

Counts, ACS 2020-2024 5-year estimates, with the change from 2015-2019
Measure	Grundy County	Illinois	Change since 2015-2019
Total population	53,219	12,694,798	+2,553
Households	20,595±212	5,036,449	+919
Average household size	2.57±0.03	2.46	no clear change
Housing units	21,384±101	5,457,452	+461

Grundy County's population since 2000

From 37,535 in 2000 to 54,052 in 2025: up 44.0%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.

2000 Census 37,535
2005 (estimate) 44,181
2010 Census 50,063
2015 (estimate) 50,358
2020 Census 52,533
2025 (estimate) 54,052

Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov

What cities and towns are in Grundy County?

Grundy County holds 34 places: 17 cities, villages and boroughs (incorporated places) and 17 towns and townships (county subdivisions with their own government). The largest is Aux Sable Township with 15,963 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.

Places in Grundy County, ACS 2020-2024 5-year estimates. Ring: estimate with a coefficient of variation over 40%.

Aux Sable Township	township	15,361	15,630±52	$109,269	$321,100	3.9%	100%
Morris	city	14,163	14,898±468	$76,711	$247,400	7.7%	100%
Minooka	village	12,758	12,891±693	$115,445	$315,600	2.6%	75%
Morris Township	township	7,139	7,239±19	$74,458	$206,100	10.4%	100%
Braceville Township	township	6,463	6,529±43	$83,357	$220,100	5.7%	100%
Saratoga Township, Grundy County	township	6,342	6,483±25	$81,642	$292,500	5.4%	100%
Coal City	village	5,705	5,317±340	$72,857	$201,600	4.4%	100%
Felix Township	township	4,438	4,469±21	$70,843	$216,900	8.6%	100%
Channahon	village	13,383	13,927±690	$119,494	$327,900	5.9%	31%
Diamond	village	2,640	2,984±414	$73,201	$220,200	10.5%	100%
Erienna Township	township	2,408	2,626±408	$96,906	$324,100	3.8%	100%
Wauponsee Township	township	2,289	2,742±435	$117,928	$293,800	2.8%	100%
Goose Lake TownshipGEOID 1706330549	township	1,755	1,170±329	$116,648	$452,200	0.0%	100%
Mazon Township	township	1,503	1,663±251	$82,273	$214,000	8.1%	100%
Garfield Township	township	1,454	1,511±229	$88,092	$194,400	16.0%	100%
Gardner	village	1,366	1,410±224	$88,092	$199,600	16.1%	100%
Greenfield Township	township	991	789±163	$88,750	$182,800	5.3%	100%
Mazon	village	979	1,401±245	$73,750	$207,700	9.6%	100%
Braceville	village	724	860±201	$89,167	$187,900	11.4%	100%
South Wilmington	village	710	600±142	$86,750	$174,400	5.7%	100%
Vienna Township	township	666	600±161	$98,594	$212,100	8.2%	100%
Nettle Creek Township	township	501	805±218	$129,375	$413,000	3.1%	100%
Carbon HillGEOID 1711176	village	372	441±157	$103,125	$238,600	5.9%	100%
Goodfarm TownshipGEOID 1706330432	township	353	234±103	$85,938	$248,100	1.7%	100%
Norman TownshipGEOID 1706353286	township	321	243±92	$218,542	$372,200	0.0%	100%
Maine Township, Grundy CountyGEOID 1706346175	township	293	201±88	not published	$305,300	11.9%	100%
Highland TownshipGEOID 1706334657	township	256	285±139	$127,321	not published	3.5%	100%
Verona	village	208	272±76	$45,313	$118,800	18.0%	100%
KinsmanGEOID 1740143	village	90	84±38	$53,750	$103,100	11.9%	100%
East BrooklynGEOID 1721579	village	80	50±22	$83,750	$232,100	16.0%	100%
Godley	village	566	602±210	$53,438	$144,600	16.5%	8%
Dwight	village	4,032	3,872±355	$71,184	$155,600	11.7%	0%
Seneca	village	2,353	2,450±168	$86,830	$227,500	22.2%	0%
Braidwood	city	6,194	6,062±222	$82,202	$202,500	7.3%	0%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov

Who lives in Grundy County?

The median resident of Grundy County is 38.3 years old; 24.3% are under 18 and 15.1% are 65 or older. The largest group is non-Hispanic white residents at 82.4%, then Hispanic or Latino residents (of any race) at 12.0%. 4.1% of residents were born outside the United States.

Age, origin and education, ACS 2020-2024 5-year estimates. Race groups are non-Hispanic; Hispanic includes any race.
Measure	Grundy County	Illinois	Change since 2015-2019
Median age	38.3±0.6	39.0	no clear change
Under 18 years	24.3%±0.1 pts	21.8%	–
65 years and over	15.1%±0.1 pts	17.0%	–
Hispanic or Latino (any race)	12.0%	18.8%	+2.1 pts
White alone, not Hispanic	82.4%±0.5 pts	58.1%	−3.9 pts
Black or African American alone, not Hispanic	2.3%±0.2 pts	13.3%	+1.1 pts
Asian alone, not Hispanic	0.6%±0.2 pts	5.9%	no clear change
American Indian and Alaska Native alone, not Hispanic	0.1%±0.1 pts	0.1%	–
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0.0%±0.1 pts	0.0%	–
Two or more races, not Hispanic	2.4%±0.6 pts	3.4%	–
Some other race alone, not Hispanic	0.3%±0.2 pts	0.4%	–
Born outside the United States	4.1%±0.9 pts	14.7%	no clear change
Speak a language other than English at home (age 5+)	8.5%±1.0 pts	24.0%	–
Civilian veterans (age 18+)	7.1%±0.9 pts	4.8%	–
With a disability	9.7%±1.0 pts	12.1%	–
No health insurance coverage	3.4%±0.6 pts	6.9%	no clear change
High school graduate or higher (age 25+)	93.8%±1.0 pts	90.5%	–
Bachelor's degree or higher (age 25+)	23.6%±1.8 pts	37.8%	no clear change
Graduate or professional degree (age 25+)	7.5%±1.0 pts	15.3%	–
Moved from another state in the past year	0.8%±0.5 pts	1.6%	–

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov

What do households in Grundy County earn?

Half of Grundy County's 20,595 households earn less than $92,235 a year (±$7,255), against $83,390 in Illinois. In 2015-2019 it was $95,194 in 2024 dollars; the margins of error cannot tell the two periods apart. 6.0% of residents live below the poverty line.

Income and poverty in 2024 dollars, ACS 2020-2024 5-year estimates
Measure	Grundy County	Illinois	Change since 2015-2019
Median household income	$92,235±$7,255	$83,390	no clear change
Mean household income	$111,828±$4,693	$115,638	–
Per capita income	$43,656±$1,661	$46,406	no clear change
People below the poverty line	6.0%±1.1 pts	11.8%	no clear change
Children under 18 below the poverty line	8.1%±2.2 pts	15.1%	no clear change
Households receiving SNAP	10.9%±1.7 pts	13.8%	–
Households with a broadband subscription	91.8%±1.5 pts	90.8%	–

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov

What does housing cost in Grundy County?

Owners occupy 74.4% of Grundy County's occupied homes and renters 25.6%. The median owner-occupied home is valued at $271,700 by its owner (±$10,409). The median renter pays $1,177 a month including utilities, and 35.0% of renters pay 35% or more of their income on rent.

Housing, ACS 2020-2024 5-year estimates
Measure	Grundy County	Illinois	Change since 2015-2019
Median home value (owner-occupied)	$271,700±$10,409	$263,300	+$26,423
Median gross rent	$1,177±$59	$1,274	no clear change
Renters paying 35% or more of income on rent	35.0%±6.1 pts	39.0%	no clear change
Median monthly owner costs, with a mortgage	$2,016±$67	$1,987	–
Owner-occupied homes	74.4%±1.9 pts	67.1%	+3.1 pts
Housing units	21,384±101	5,457,452	+461
Homeowner vacancy rate	0.3%±0.3 pts	1.0%	–
Rental vacancy rate	1.0%±1.0 pts	5.0%	–
Single-family detached homes	71.8%±2.1 pts	58.2%	–
Mobile homes	3.9%±1.0 pts	2.3%	–
Built 2020 or later	1.8%±0.7 pts	0.7%	–
Built 1939 or earlier	11.2%±1.5 pts	20.2%	–

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov

How many new homes is Grundy County building?

Builders took permits for 114 new housing units across Grundy County in 2025 (56 single-family), 2.1 per 1,000 residents.

2019 207 units
2020 127 units
2021 78 units
2022 53 units
2023 55 units
2024 88 units
2025 114 units

Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey

How do people in Grundy County get to work?

82.1% of Grundy County's workers drive alone and 10.0% work from home. The average trip to work takes 26.8 minutes. The unemployment rate in 2020-2024 averaged 4.6%.

Work and commuting, ACS 2020-2024 5-year estimates
Measure	Grundy County	Illinois	Change since 2015-2019
In the labor force (age 16+)	67.3%±1.5 pts	65.0%	–
Unemployment rate	4.6%±1.1 pts	5.8%	no clear change
Drove alone to work	82.1%±2.0 pts	65.9%	–
Carpooled	5.2%±1.0 pts	7.8%	–
Public transportation	0.4%±0.3 pts	5.8%	–
Walked	1.4%±0.4 pts	2.8%	–
Worked from home	10.0%±1.7 pts	15.9%	+6.3 pts
Mean travel time to work	26.8 min±1.1	27.8 min	−2.4 min

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov

What are Grundy County's census tracts?

Grundy County is divided into 10 census tracts. Among those with a reliable estimate, median household income runs from $74,167 (Tract 4) to $108,803 (Tract 1.03).

Census tracts of Grundy County, ACS 2020-2024 5-year estimates; sort by any column

Tract 1.0217063000102	Minooka (56%)	8,255	8,602±564	$104,547	$325,200	$1,374	2.9%
Tract 1.0317063000103	Channahon (35%)	7,593	7,337±623	$108,803	$309,000	$1,600	5.3%
Tract 217063000200	Morris (33%)	6,864	7,267±655	$95,813	$298,300	$1,133	5.3%
Tract 317063000300	Morris (96%)	3,350	3,750±609	$82,214	$210,800	$1,472	5.1%
Tract 417063000400	Morris (96%)	5,675	5,827±417	$74,167	$255,100	$1,056	10.9%
Tract 517063000500	Seneca (4%)	2,799	2,807±310	$106,161	$294,800	$895	2.7%
Tract 617063000600	Mazon (9%)	2,826	2,798±260	$88,462	$216,500	$1,018	7.6%
Tract 717063000700	Coal City (28%)	6,113	5,910±463	$79,357	$255,000	$1,074	6.6%
Tract 817063000800	Coal City (59%)	5,465	5,306±208	$84,697	$234,700	$1,172	4.1%
Tract 917063000900	Gardner (25%)	3,593	3,615±285	$84,943	$185,700	$1,082	12.4%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov

How does Grundy County compare with Illinois's other counties?

Grundy County's rank among Illinois's counties with a reliable estimate (1 = highest)
Measure	Rank
Population	26th of 102
Growth 2020-2025	2nd of 102
Residents per square mile	22nd of 102
Median household income	10th of 102
Median home value	9th of 102
Median gross rent	8th of 102
Poverty rate	100th of 102
Bachelor's degree or higher	35th of 102
Median age	92nd of 102

Every county in Illinois

Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed

How these figures are made: methodology and release checks · reading a margin of error · every state · corrections

Not on this page: crime, weather and schools for Grundy County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.