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County · code 17075

Iroquois CountyIllinois

Iroquois County, Illinois, was formed on February 26, 1833, from Vermilion County and is seated in Watseka. The county was named after the Iroquois River.

  • Founded1833
  • County seatWatseka
  • Named forIroquois River, Illinois
  • Land area1,117 sq mi + 1.6 sq mi water
  • Population27,077 2020 Census
  • Parcels mapped28,244 checked 14 October 2026
Open the free map Click any parcel in Iroquois County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

KankakeeFordNewton, INVermilion Watseka Census outline · seat marked

Where it is

Iroquois on the map of Illinois

Illinois has 102 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Illinois · Iroquois highlighted

History

Formed in 1833 from Vermilion County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Iroquois County was created from Non-County Area 9 and Non-County Area 4 attached to Vermilion County, but was not fully organized at first and remained attached to Vermilion for judicial and other county purposes. The county was fully organized on February 24, 1834, and detached from Vermilion. Iroquois County lost territory to the creation of Will County on January 12, 1836, and later lost more territory to the creation of Kankakee County on April 5, 1853.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1833
    Iroquois County created Iroquois created from Non-County Area 9 and Non-County Area 4 attached to Vermilion; Iroquois not fully organized, attached to Vermilion "for judicial and other county purposes."
    from Vermilion
    · Ill. Laws 1832-1833, priv., pp. 19-20
  2. 1834
    Changed Iroquois fully organized, detached from Vermilion.
    Vermilion
    · Beckwith, Iroquois, 343
  3. 1836
    Lost territory Iroquois lost to creation of Will.
    to Will
    · Ill. Laws 1835-1836, pp. 262-263
  4. 1851
    Changed Legislature authorized creation of Kankakee from Iroquois and Will, dependent on local referendum that failed.
    KankakeeWill
    · Ill. Laws 1851, gen., pp. 30-35
  5. 1853
    Lost territory Iroquois lost to creation of Kankakee.
    to Kankakee
    · Ill. Laws 1853, gen., pp. 159-163
  6. 1867
    Changed Legislature authorized Kankakee to gain from Iroquois the remainder of township 29 north all along its southern boundary, dependent on local referendum that failed (no change).
    Kankakee
    · Ill. Laws 1867, priv., 3:632-634

Land and parcels

What the maps cover in Iroquois

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Iroquois by the Census

Population
27,077 2020 Census count
Housing units
12,779 2020 Census count
Land area
1,117 square miles
Water area
1.6 square miles
People per sq mi
24 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Iroquois County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

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Questions

Common questions about Iroquois County

When was Iroquois County founded?
Iroquois County was founded in 1833, formed from Vermilion County, and named after Iroquois River, Illinois.
What is the county seat of Iroquois County?
The county seat of Iroquois County is Watseka.
Is there an online parcel map for Iroquois County?
Yes. A public source publishes a parcel map of 28,244 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Iroquois County's boundary or name changed?
Iroquois County was created in 1833 from Vermilion County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Kankakee County, Vermilion County and Will County.
Is my lot in a flood zone?
We do not have flood maps for Iroquois County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door