County · code 17039
De Witt CountyIllinois
De Witt County is a county in Illinois with its seat in Clinton, formed in 1839.
- Founded1839
- County seatClinton
- Named forDeWitt Clinton
- Land area398 sq mi + 7.5 sq mi water
- Population15,516 2020 Census
- Parcels mapped11,146 checked 15 October 2026
Where it is
De Witt 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 McLean County and Macon County
An old deed may name a county that no longer exists, or a boundary that has since moved.
De Witt County was created from McLean and Macon counties on March 1, 1839, and was named after DeWitt Clinton. The county lost territory to the creation of Piatt County in 1841 and lost additional land to Logan County in 1845.
- 1839De Witt County created De Witt created from McLean and Macon. · Ill. Laws 1838-1839, pp. 199-201
- 1841
- 1845
Land and parcels
What the maps cover in De Witt
Who publishes each layer, how good it is, and when we last checked.
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Parcels Official
Lot lines and tax-map numbers for 11,146 parcels from De Witt County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 9 October 2026 · checked 15 October 2026 -
Address points Missing
No public address points layer found for De Witt 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
De Witt 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
Who to ask before you build, dig or sell
Official county pages only. We link to them; we do not copy them, because they change.
Inside a city or town, permits usually come from that city rather than the county.
Permits
County government
- County government
The official website of De Witt County.
See your own lot on these maps
Open De Witt 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 De Witt County
- When was De Witt County founded?
- De Witt County was founded in 1839, formed from McLean County and Macon County, and named after DeWitt Clinton.
- What is the county seat of De Witt County?
- The county seat of De Witt County is Clinton.
- Is there an online parcel map for De Witt County?
- Yes. De Witt County publishes a parcel map of 11,146 parcels, rated official here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has De Witt County's boundary or name changed?
- De Witt County was created in 1839 from McLean County and Macon County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Logan County and Piatt County.
- Who issues building permits in De Witt County?
- The county's page on building permits: Building Permit (Cloudpermit). Inside a city or town, ask that city first.
- Is my lot in a flood zone?
- We do not have flood maps for De Witt County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby