County · Illinois

LaSalle County, Illinois

LaSalle County, Illinois. LaSalle County had 107,773 residents in 2025 by the Census Bureau's estimate, down 1.7% since 2020, a steeper fall than Illinois's (−0.8%). It holds 70 places (27 cities, villages and boroughs, 37 towns and townships and 6 census-designated) and 28 census tracts. GEOID 17099.

LaSalle County is one of the 3 counties of the Ottawa, IL micropolitan statistical area (the Census Bureau's July 2023 delineation).

Residents, July 2025 estimate

107,773

Census Bureau estimate (no margin published)
2020 Census count: 109,658 · ACS 2020-2024: 108,714

Median household income

$73,045

±$2,890 (90% margin)
Illinois: $83,390

Median home value

$161,900

±$2,651 (90% margin)
Illinois: $263,300

Median gross rent

$928

±$24 (90% margin)
Illinois: $1,274

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

The 2020 Census counted 109,658 residents in LaSalle County. The Census Bureau estimates 107,773 for July 1, 2025, down 1.7% since 2020, a steeper fall than Illinois's (−0.8%). The 2020-2024 American Community Survey puts the population at 108,714 over 1,135 square miles of land.

July 2020→2021 −732 (108,679)
2021→2022 −881 (107,798)
2022→2023 +74 (107,872)
2023→2024 +3 (107,875)
2024→2025 −102 (107,773)

LaSalle County in Illinois. Boundaries: Census Bureau 2024.

Counts, ACS 2020-2024 5-year estimates, with the change from 2015-2019
Measure	LaSalle County	Illinois	Change since 2015-2019
Total population	108,714	12,694,798	−1,023
Households	45,373±562	5,036,449	no clear change
Average household size	2.33±0.03	2.46	no clear change
Housing units	49,843±57	5,457,452	−308

LaSalle County's population since 2000

From 111,509 in 2000 to 107,773 in 2025: down 3.4%. 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 111,509
2005 (estimate) 112,565
2010 Census 113,924
2015 (estimate) 111,015
2020 Census 109,658
2025 (estimate) 107,773

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 LaSalle County?

LaSalle County holds 70 places: 27 cities, villages and boroughs (incorporated places), 37 towns and townships (county subdivisions with their own government) and 6 census-designated places. The largest is Ottawa with 18,684 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 LaSalle County, ACS 2020-2024 5-year estimates. Ring: estimate with a coefficient of variation over 40%.

Ottawa	city	18,840	18,447±584	$71,413	$154,000	17.3%	100%
LaSalle Township	township	13,369	13,287±54	$61,240	$122,900	16.1%	100%
Streator	city	12,500	12,330±524	$57,609	$94,700	20.3%	99%
Bruce Township	township	11,800	11,794±35	$53,477	$94,200	22.2%	100%
Ottawa Township	township	11,193	11,204±39	$70,008	$139,500	16.6%	100%
Peru Township	township	10,191	10,070±38	$75,417	$156,800	9.0%	100%
Peru	city	9,896	9,775±207	$74,808	$154,300	9.0%	100%
LaSalle	city	9,582	9,498±144	$57,732	$113,500	18.8%	100%
South Ottawa Township	township	8,343	8,322±21	$84,054	$169,500	13.5%	100%
Northville Township	township	7,338	7,316±19	$103,819	$272,700	3.7%	100%
Mendota Township	township	7,207	7,071±41	$58,333	$147,200	13.0%	100%
Mendota	city	7,061	6,994±293	$51,632	$134,100	14.1%	100%
Manlius Township, LaSalle County	township	6,150	6,100±23	$68,967	$171,700	19.8%	100%
Lake Holiday	CDP	5,687	5,641±339	$107,875	$256,400	2.9%	100%
Marseilles	city	4,845	4,279±228	$58,217	$142,500	21.5%	100%
Mission Township	township	4,019	4,054±26	$85,727	$227,700	8.4%	100%
Oglesby	city	3,712	3,570±229	$76,189	$139,700	9.6%	100%
Rutland Township, LaSalle County	township	3,662	3,589±25	$91,406	$226,400	12.3%	100%
Otter Creek Township, LaSalle County	township	2,643	2,642±22	$83,750	$150,700	25.1%	100%
Dayton Township	township	2,455	1,971±458	$76,042	$254,800	25.1%	100%
Earl Township	township	2,432	2,574±290	$68,277	$158,400	14.9%	100%
Sheridan	village	2,431	2,519±214	$85,250	$186,400	10.9%	100%
Seneca	village	2,353	2,450±168	$86,830	$227,500	22.2%	100%
Utica Township	township	1,915	1,886±259	$113,060	$242,600	3.8%	100%
Adams Township	township	1,619	1,916±467	$67,424	$237,900	26.7%	100%
Earlville	city	1,613	1,942±276	$63,553	$142,200	16.5%	100%
Eagle Township	township	1,599	1,530±335	$54,306	$152,600	7.3%	100%
Eden Township	township	1,398	1,311±198	$81,786	$134,700	6.9%	100%
North Utica	village	1,323	1,282±188	$104,028	$237,500	4.7%	100%
Troy Grove Township	township	1,259	1,437±436	$84,917	$164,700	17.7%	100%
Serena TownshipGEOID 1709968692	township	1,191	1,120±311	$104,236	$323,600	5.6%	100%
Brookfield TownshipGEOID 1709908583	township	1,069	1,038±385	$83,958	$309,600	12.3%	100%
Leland	village	951	1,065±232	$79,583	$186,800	12.7%	100%
Farm Ridge Township	township	844	871±146	$76,382	$168,500	11.9%	100%
Fall River Township	township	802	900±179	$105,859	$243,200	0.6%	100%
Dimmick Township	township	755	712±192	$118,654	$295,500	0.8%	100%
Tonica	village	749	717±131	$90,000	$126,300	8.9%	100%
Freedom Township, LaSalle CountyGEOID 1709927845	township	619	432±159	$121,042	$362,900	1.4%	100%
Wallace TownshipGEOID 1709978487	township	575	623±181	$102,917	$249,600	4.0%	100%
Miller TownshipGEOID 1709949204	township	574	590±269	$102,963	$296,800	0.0%	100%
Hope Township	township	570	640±120	$95,625	$121,300	7.7%	100%
Groveland Township, LaSalle County	township	569	486±104	$73,750	$88,800	7.0%	100%
Allen Township	township	531	407±95	$92,500	$153,000	6.4%	100%
DaytonGEOID 1718771	CDP	528	271±75	$73,750	$271,000	8.5%	100%
Grand Ridge	village	515	584±126	$78,929	$158,700	14.6%	100%
Waltham TownshipGEOID 1709978682	township	510	613±298	$82,321	$263,900	2.0%	100%
Deer Park TownshipGEOID 1709919096	township	459	438±93	$91,429	$252,100	1.4%	100%
Ophir TownshipGEOID 1709956224	township	436	476±214	not published	$309,700	1.7%	100%
Lostant	village	423	407±86	$65,417	$100,000	10.8%	100%
Naplate	village	412	589±153	$71,875	$135,600	13.1%	100%
Millington	village	617	729±191	$81,775	$230,700	7.7%	67%
Vermillion TownshipGEOID 1709977623	township	395	331±97	$74,375	$220,800	20.5%	100%
Richland Township, LaSalle CountyGEOID 1709963576	township	362	252±55	$90,500	$142,900	12.0%	100%
Ransom	village	308	245±71	$82,500	$93,300	7.8%	100%
Grand Rapids TownshipGEOID 1709930744	township	299	179±82	$66,250	$219,400	7.3%	100%
Meriden TownshipGEOID 1709948463	township	271	344±153	$100,455	$162,500	8.9%	100%
Cedar Point	village	266	262±89	$73,125	$90,000	5.0%	100%
RutlandGEOID 1766443	village	259	195±56	$60,625	$76,400	9.7%	100%
Somonauk	village	1,786	1,569±240	$84,583	$234,400	3.9%	13%
KangleyGEOID 1738921	village	235	302±142	$88,125	$96,100	7.9%	100%
Osage TownshipGEOID 1709956731	township	235	188±101	$58,250	$173,200	14.4%	100%
Troy GroveGEOID 1776225	village	225	300±174	$83,917	$200,800	47.3%	100%
Dana	village	162	152±50	$62,500	$85,000	9.9%	100%
WedronGEOID 1779618	CDP	140	0±13	not published	not published	–	100%
HardingGEOID 1732876	CDP	133	18±24	not published	not published	0.0%	100%
SerenaGEOID 1768679	CDP	129	182±160	not published	not published	23.1%	100%
LeonoreGEOID 1742912	village	121	97±35	$47,500	$76,300	26.8%	100%
TriumphGEOID 1776082	CDP	100	83±72	not published	$108,600	9.6%	100%
Wenona	city	974	999±191	$43,300	$101,100	17.0%	2%
Dalzell	village	663	736±163	$77,500	$161,700	8.4%	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 LaSalle County?

The median resident of LaSalle County is 42.2 years old; 21.2% are under 18 and 19.9% are 65 or older. The largest group is non-Hispanic white residents at 82.1%, then Hispanic or Latino residents (of any race) at 11.2%. 3.9% 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	LaSalle County	Illinois	Change since 2015-2019
Median age	42.2±0.3	39.0	no clear change
Under 18 years	21.2%±0.1 pts	21.8%	–
65 years and over	19.9%±0.1 pts	17.0%	–
Hispanic or Latino (any race)	11.2%	18.8%	+1.5 pts
White alone, not Hispanic	82.1%±0.3 pts	58.1%	−3.3 pts
Black or African American alone, not Hispanic	2.5%±0.2 pts	13.3%	no clear change
Asian alone, not Hispanic	0.8%±0.1 pts	5.9%	no clear change
American Indian and Alaska Native alone, not Hispanic	0.0%±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	3.1%±0.4 pts	3.4%	–
Some other race alone, not Hispanic	0.3%±0.1 pts	0.4%	–
Born outside the United States	3.9%±0.4 pts	14.7%	no clear change
Speak a language other than English at home (age 5+)	7.9%±0.6 pts	24.0%	–
Civilian veterans (age 18+)	7.7%±0.6 pts	4.8%	–
With a disability	13.9%±0.8 pts	12.1%	–
No health insurance coverage	4.0%±0.5 pts	6.9%	no clear change
High school graduate or higher (age 25+)	91.8%±0.7 pts	90.5%	–
Bachelor's degree or higher (age 25+)	20.5%±1.1 pts	37.8%	+2.7 pts
Graduate or professional degree (age 25+)	6.5%±0.7 pts	15.3%	–
Moved from another state in the past year	0.9%±0.4 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 LaSalle County earn?

Half of LaSalle County's 45,373 households earn less than $73,045 a year (±$2,890), against $83,390 in Illinois. In 2015-2019 it was $71,555 in 2024 dollars; the margins of error cannot tell the two periods apart. 13.9% of residents live below the poverty line.

Income and poverty in 2024 dollars, ACS 2020-2024 5-year estimates
Measure	LaSalle County	Illinois	Change since 2015-2019
Median household income	$73,045±$2,890	$83,390	no clear change
Mean household income	$93,009±$3,127	$115,638	–
Per capita income	$39,375±$1,283	$46,406	+$2,113
People below the poverty line	13.9%±1.3 pts	11.8%	no clear change
Children under 18 below the poverty line	21.0%±2.9 pts	15.1%	no clear change
Households receiving SNAP	14.8%±1.3 pts	13.8%	–
Households with a broadband subscription	87.4%±1.1 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 LaSalle County?

Owners occupy 74.4% of LaSalle County's occupied homes and renters 25.6%. The median owner-occupied home is valued at $161,900 by its owner (±$2,651). The median renter pays $928 a month including utilities, and 36.4% of renters pay 35% or more of their income on rent.

Housing, ACS 2020-2024 5-year estimates
Measure	LaSalle County	Illinois	Change since 2015-2019
Median home value (owner-occupied)	$161,900±$2,651	$263,300	+$5,356
Median gross rent	$928±$24	$1,274	no clear change
Renters paying 35% or more of income on rent	36.4%±3.6 pts	39.0%	no clear change
Median monthly owner costs, with a mortgage	$1,476±$34	$1,987	–
Owner-occupied homes	74.4%±1.4 pts	67.1%	+2.6 pts
Housing units	49,843±57	5,457,452	−308
Homeowner vacancy rate	1.2%±0.5 pts	1.0%	–
Rental vacancy rate	3.9%±1.6 pts	5.0%	–
Single-family detached homes	78.8%±1.4 pts	58.2%	–
Mobile homes	4.2%±0.6 pts	2.3%	–
Built 2020 or later	0.7%±0.3 pts	0.7%	–
Built 1939 or earlier	24.6%±1.4 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 LaSalle County building?

Builders took permits for 60 new housing units across LaSalle County in 2025 (56 single-family), 0.6 per 1,000 residents.

2019 120 units
2020 93 units
2021 77 units
2022 94 units
2023 92 units
2024 77 units
2025 60 units

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

How do people in LaSalle County get to work?

83.0% of LaSalle County's workers drive alone and 5.1% work from home. The average trip to work takes 26.0 minutes. The unemployment rate in 2020-2024 averaged 5.4%.

Work and commuting, ACS 2020-2024 5-year estimates
Measure	LaSalle County	Illinois	Change since 2015-2019
In the labor force (age 16+)	61.3%±1.0 pts	65.0%	–
Unemployment rate	5.4%±0.7 pts	5.8%	no clear change
Drove alone to work	83.0%±1.2 pts	65.9%	–
Carpooled	8.2%±1.0 pts	7.8%	–
Public transportation	0.2%±0.1 pts	5.8%	–
Walked	1.8%±0.4 pts	2.8%	–
Worked from home	5.1%±0.7 pts	15.9%	+1.7 pts
Mean travel time to work	26.0 min±1.1	27.8 min	+2.6 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 LaSalle County's census tracts?

LaSalle County is divided into 28 census tracts. Among those with a reliable estimate, median household income runs from $42,361 (Tract 9633) to $108,614 (Tract 9622).

All 28 census tracts of LaSalle County, with their figures

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

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

LaSalle County's rank among Illinois's counties with a reliable estimate (1 = highest)
Measure	Rank
Population	17th of 102
Growth 2020-2025	39th of 102
Residents per square mile	23rd of 102
Median household income	32nd of 102
Median home value	31st of 102
Median gross rent	23rd of 102
Poverty rate	35th of 102
Bachelor's degree or higher	59th of 102
Median age	54th 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 LaSalle 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.