United States, property records
Illinois property data
4,257,470 residential parcels in Illinois on our national assessor and recorder file, with owner, mailing address, structure characteristics, values, sales and liens keyed to the parcel. Fill rates below are measured on the 09/01/2026 snapshot, residential parcels as the denominator.
Field fill rates in Illinois
The share of residential parcels in Illinois on which each field is populated. Owner name, mailing address, lot size, assessed value and coordinates are filled on effectively every parcel nationally and are omitted. The structure fields are the ones that vary, because they come from county field cards that not every county publishes.
| Field | Illinois | National |
|---|---|---|
| Year built | 84.7% | 90.7% |
| Living area | 75.1% | 90.0% |
| Bedrooms | 99.7% | 98.8% |
| Bathrooms | 85.9% | 89.7% |
| Stories | 67.6% | 80.9% |
| Heating | 49.8% | 74.2% |
| Air conditioning | 59.7% | 63.0% |
| Garage | 67.2% | 62.1% |
| Exterior walls | 51.6% | 64.0% |
| Building condition | 43.7% | 56.1% |
| Building quality | 43.2% | 53.6% |
| Roof cover | 39.8% | 55.0% |
| Construction type | 51.6% | 47.5% |
| Roof type | 3.1% | 37.3% |
| Current valuation | 98.1% | 96.5% |
| Assessed value | 99.9% | 98.8% |
| Pool (reporting rate) | 0.7% | 7.7% |
Denominator: parcels with a residential land use code. Fill rates on all parcels, including vacant land and commercial, are lower; on parcels with a building they are higher and the denominator varies by state. We use residential throughout so states compare.
What the Illinois file is used for
- Loading the state into a warehouse or product under a bulk license
- Owner and mailing-address appends for Illinois addresses
- Insurance underwriting inputs where the structure fields are filled, with the roof field supplemented from permit history because Illinois counties publish it on only 39.8% of parcels
- Purchase, refinance and new-homeowner triggers from the recorder side of the file
Illinois sits near the national pattern: the basic characteristics are well covered and the structure codes are filled on a majority but not all parcels.