- county
- FIPS 17197
- Largest town: Joliet
Will County, Illinois
Will County had 708,583 residents in the Census Vintage 2024 estimate, on 835.9 square miles of land. It ranks 4th of 102 in Illinois by population and 13th by land area.
- Population
- 708,583
- #4 of 102 in Illinois · #99 in US
- Area
- 835.9 sq mi
- #13 of 102 in Illinois · #1,004 in US
- Density
- 848 / sq mi
- #5 of 102 in Illinois · #183 in US
- Median household income
- $103,587
- #4 of 102 in Illinois · #102 in US
Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area
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Will County population, land area and income
Will County had 708,583 residents in the Census Vintage 2024 estimate, on 835.9 square miles of land. It ranks 4th of 102 in Illinois by population and 13th by land area. That works out to 847.7 people per square mile, 8.8 times the US average of 96.3, and in the top tenth nationally.
The median county-equivalent in Illinois has 24,447 residents, so Will County is 29.0 times that size.
Its SAIPE 2023 median household income of $103,587 is in the top tenth among 3,143 counties with an estimate.
National rank among 3,144
Population
708,583
99th of 3,144 (US)
Land area
836 sq mi
1004th of 3,144 (US)
Density
847.7 / sq mi
183rd of 3,144 (US)
Median household income
$103,587
102nd of 3,143 (US)
Rank within Illinois (102)
Population
708,583
4th of 102 (IL)
Land area
836 sq mi
13th of 102 (IL)
Density
847.7 / sq mi
5th of 102 (IL)
Median household income
$103,587
4th of 102 (IL)
How Will County's population changed since 2020
Will County gained 11,674 residents between the July 2020 and July 2024 estimates, a rise of 1.7%. That ranks 5th 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, Will County recorded 29,297 births and 23,273 deaths, a natural change of +6,024. Net international migration added +9,351 and net domestic migration, people moving to or from other US counties, came to -4,579. The largest single component was international migration, which added 9,351 people.
Components of change, April 2020 to July 2024
- Births
- 29,297
- Deaths
- 23,273
- Net international migration
- +9,351
- Net domestic migration
- -4,579
- Change, July 2023 to July 2024
- +5,200
Where Will County is
The Census internal point of Will County is at 41.448500, -87.978500. 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 Will County outlined. Dots are towns of 1,000+ people with residents in it.
- < -3.0%
- < -2.2%
- < -1.4%
- < -0.3%
- ≥ -0.3%
Orange pin: Will County internal point. Dark pin: Springfield.
Internal point
- Decimal
- 41.448500, -87.978500
- DMS
- 41°26'54.60"N 87°58'42.60"W
- UTM
- 16N 418266.5E 4589008.8N
- Geohash
- dp37y12p0
- Plus code
- 86HJC2XC+CJ
Towns in Will County
33 incorporated places of 1,000+ people have residents in Will County, 606,129 people together, or 86% of the county. Each figure counts only the part of the town inside Will County; towns marked "part" extend into another county. The largest is Joliet with 137,376.
- 01Joliet (part)137,376
- 02Bolingbrook (part)73,265
- 03Naperville (part)52,373
- 04Plainfield (part)45,510
- 05Romeoville41,177
- 06New Lenox28,480
- 07Lockport26,915
- 08Homer Glen24,852
- 09Frankfort21,160
- 10Crest Hill20,223
- 11Mokena19,915
- 12Shorewood18,522
- 13Aurora (part)11,803
- 14Manhattan10,772
- 15Channahon (part)9,871
Counties bordering Will County
The Census 2024 county adjacency file lists 6 neighbors for Will County, including 1 across a state line. The most populous is Cook County, IL, with 5,182,617 residents. Distances run between Census internal points in a straight line.
Distance to Springfield and the nearest big city
Springfield is 144.8 miles SW of Will County's internal point in a straight line. The nearest place of 100,000 or more is Joliet, IL (population 151,837), 9.9 miles away. The nearest place of 10,000 or more is Manhattan, IL (population 10,772), 2.0 miles away.
Will County FIPS code
The FIPS code of Will County is 17197: state code 17 for Illinois plus county code 197. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $103,587.
Questions people ask
What is the population of Will County, Illinois?
The Census Vintage 2024 estimate for July 1, 2024 is 708,583. That is up 11,674 people (1.7%) from the July 2020 estimate of 696,909.
What is the FIPS code of Will County?
17197. The first two digits (17) are Illinois; the last three (197) identify the county.
What is the largest town in Will County?
Joliet, with 137,376 residents inside Will County in 2024 (151,837 across all 2 counties it spans).
Which counties border Will County?
6 county-equivalents border it in the Census 2024 adjacency file: Cook County, IL; DuPage County, IL; Lake County, IN; Kendall County, IL; Kankakee 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.
- 01Census Vintage 2024 county population estimates
- 02Census 2024 Gazetteer, counties
- 03Census SAIPE 2023 state and county estimates
- 04Census Vintage 2024 subcounty population estimates
- 05Census 2024 county adjacency file
- 06Census 2024 cartographic boundary file, counties (1:5,000,000)
How every number is computed: methodology. Spotted a wrong figure? Report an error.