Williamson County property record for 503 Onley St, Carterville, IL 62918
| Property Type | Single Family Home |
|---|---|
| Details | 1,312 sqft · built 1914 |
| Lot Size | 0.117 acres (5,135 sqft) |
| Owner | 2 Trust Names on File |
| Tax Bill | $2,029 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 05-03-434-003 |
| Primary APN | 05-03-434-003 |
|---|
| Plumbing Fixtures | 5 Plumbing Fixtures |
|---|---|
| Stories | 1 Story |
| Building Area | 1,312 sqft Living Area |
| 1st Floor Area | 1,312 sqft |
| Year Built | Built 1914 |
|---|---|
| Effective Year Built | Effective 1914 |
| Exterior Material | Other |
| Lot Area | 5,135 sqft (0.117 acres) |
| Garage Area | 432 sqft |
| Parking Spaces | 1 Parking Space |
| Porch | Slab |
| Porch Area | 112 sqft |
| Patio Area | 192 sqft |
| Heating System | Gas |
|---|
| Street Address | 503 ONLEY ST |
|---|---|
| City | CARTERVILLE |
| State | IL |
| Zip | 62918-1161 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | ONLEY 1ST ADDN |
| Legal Subdivision | ONLEY 1ST ADD |
| Legal Block | 6 |
| Legal Lot Number | 3 |
| Jurisdiction | WILLIAMSON IL |
| Township / Civil Division | CARTERVILLE |
| Census Block Group | 5 |
| Census Block | 5023 |
| Census Tract | 20201 |
503 Onley St, a single family home, is held in a trust.
Source: Williamson County records, as of October 20, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 303 CALIFORNIA ST, CARTERVILLE, IL 62918-1927 |
| Owner Type | Individual |
| Vesting | Trust, Irrevocable Trust |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | 2 Names on Deed |
|---|---|
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 503 Onley St was $2,029, up 6.4% from the year before.
Source: Williamson County assessment roll, as of October 20, 2026
| Type | Name |
|---|---|
| State | Illinois |
| Municipality | Carterville City |
| County | Williamson County |
| Unified School District | Carterville Community Unit School District 5 (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $2,029.00 (+6.4%) | $26,685 (+12.5%) Land $3,240 Building $23,445 | $80,055 (+12.5%) Land $9,720 Building $70,335 |
| 2024 | $1,907.00 | $23,720 Land $2,880 Building $20,840 | $71,160 Land $8,640 Building $62,520 |
| 2022 | $1,588.00 | $20,100 Land $2,440 Building $17,660 | $60,300 Land $7,320 Building $52,980 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 503 Onley St in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective July 9, 2020 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 3 in force |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Wildfire risk around 503 Onley St is low, with a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 80% of the US · above 71% of Illinois |
|---|---|
| Wildfire Likelihood | 0.01% annual chance |
| Exposure | Direct burnable vegetation |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | CARTERVILLE serves 6,528 people · EPA ID IL1990150 |
|---|---|
| Water Source | Purchased surface water from several systems |
| Last State Inspection | Feb 2026 |
| Lead | 8 ppb (2025) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | 3 last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes. The service area is an EPA estimate; the actual supplier may differ.
Source: FCC Broadband Data Collection, based on 310 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| ClearWave Fiber | 7,000 / 7,000 |
| Frontier Fiber | 7,000 / 7,000 |
| Mediacom Xtream Cable · Fiber, Fixed Wireless in parts of the area | 1,000 / 50 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: Futiva, Verizon, Wisper ISP.
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