County · code 17043
DuPage CountyIllinois
DuPage County is a county in Illinois, with its seat in Wheaton. It was created on February 9, 1839, from Cook County and the proposed Michigan County.
- Founded1839
- County seatWheaton
- Named forDuPage River, Illinois
- Land area328 sq mi + 8.6 sq mi water
- Population932,877 2020 Census
- Parcels mapped336,803 checked 16 October 2026
Where it is
DuPage on the map of Illinois
Illinois has 102 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1839 from Cook County and Michigan County
An old deed may name a county that no longer exists, or a boundary that has since moved.
DuPage County was created from Cook County on February 9, 1839, after an unsuccessful attempt to create Michigan County in the same area had been made in 1837. The county was named after the DuPage River.
- 1839DuPage County created Du Page created from Cook. On 2 March 1837, an unsuccessful attempt was made to create Michigan (proposed) in the same general area.from Cookfrom Michigan· Ill. Laws 1838-1839, pp. 73-74
- 1839Changed In August 1839, the legislature authorized Du Page to gain from Will the northern half of township 37 north, ranges 9 and 10 east, dependent on local referendum that failed (no change). · History of Will, 358-359; Ill. Laws 1838-1839, pp. 73-74
Land and parcels
What the maps cover in DuPage
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 336,803 parcels from DuPage County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 16 October 2026 -
Address points Missing
No public address points layer found for DuPage County yet.
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Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- 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
DuPage by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
DuPage County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of DuPage County.
See your own lot on these maps
Open DuPage County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about DuPage County
- When was DuPage County founded?
- DuPage County was founded in 1839, formed from Cook County and Michigan County, and named after DuPage River, Illinois.
- What is the county seat of DuPage County?
- The county seat of DuPage County is Wheaton.
- Is there an online parcel map for DuPage County?
- Yes. DuPage County publishes a parcel map of 336,803 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has DuPage County's boundary or name changed?
- DuPage County was created in 1839 from Cook County and Michigan County. Its boundary has been clarified one time since, with no change on the ground.
- Is my lot in a flood zone?
- We do not have flood maps for DuPage County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby