St. Charles County property record for 4 Onyx Ct, O Fallon, MO 63366
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,580 sqft · built 1998 |
| Lot Size | 0.27 acres (11,761 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $130,652 (Jan 1999) |
| Tax Bill | $3,887 (2025) |
| Deeds & Mortgages | Oct 2020 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | T990300241 |
| Primary APN | T990300241 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 1,580 sqft Living Area |
| Gross Area | 3,722 sqft |
| 1st Floor Area | 1,580 sqft |
| Basement Area | 1,492 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1998 |
|---|---|
| Effective Year Built | Effective 1998 |
| Architectural Style | Ranch |
| Exterior Material | Brick/Stone |
| Lot Area | 11,761 sqft (0.27 acres) |
| Terrain | Rolling |
| Garage Type | Attached |
| Garage Area | 650 sqft |
| Parking Spaces | 3 Parking Spaces |
| Porch | Open Porch |
|---|---|
| Porch Area | 68 sqft |
| Deck Area | Deck Area |
| Patio Area | 228 sqft |
| Heating Fuel | Gas |
|---|---|
| Sewer | Connected |
| Account Number | T990300241 |
|---|---|
| Street Address | 4 ONYX CT |
| City | O FALLON |
| State | MO |
| Zip | 63366-1813 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | DIAMOND POINTE #3 LOT 48 |
| Legal Subdivision | DIAMOND PT #3 |
| Legal Lot Number | 48 |
| Jurisdiction | ST CHARLES MO |
| Township / Civil Division | O'FALLON |
| Census Block Group | 4 |
| Census Block | 4004 |
| Census Tract | 311602 |
4 Onyx Ct is owned and occupied by two individuals who bought it in January 1999.
Source: St. Charles County records, as of August 7, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 4 ONYX CT, O FALLON, MO 63366-1813 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Jan 19, 1999 · Amount on File |
| Deed Sale | Jan 19, 1999 · Amount on File |
| Deed Document Number | 19994583 |
| Deed Book / Page | 2191 / 816 |
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | ST CHARLES MO |
| Property Address | 4 ONYX CT, O FALLON, MO 63366-1813 |
| Transaction Type | Mortgage |
| Record Updated | Oct 4, 2022 |
| Name | Verified Name |
|---|---|
| Address | 4 ONYX CT, O FALLON, MO 63366-1813 |
| Document Number | 0000080783 |
|---|---|
| Date | Oct 22, 2020 |
| Instrument | 2020R-080783 |
| Name | ROUNDPOINT MORTGAGE SERVICING CORP |
|---|---|
| Type | Mortgage Company |
| Address | FORT MILL, SC 29715 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 121 Months |
| Due | Nov 1, 2030 |
The 2025 property tax bill for 4 Onyx Ct was $3,887.
Source: St. Charles County assessment roll, as of August 7, 2026
| Type | Name |
|---|---|
| State | Missouri |
| County | St. Charles County |
| Municipality | O'Fallon City |
| Unified School District | Fort Zumwalt R-II School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $60,495 (-) | $318,395 (-) Land $60,000 Building $258,395 | |
| 2025 | $3,887.00 | $60,495 | $318,395 Land $60,000 Building $258,395 |
| 2023 | $55,720 | ||
| 2022 | $293,263 Land $50,000 Building $243,263 |
Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.
FEMA maps place 4 Onyx Ct in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective August 25, 2024
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Wildfire risk around 4 Onyx Ct is low, with less than 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 99.1% of the US · lower than 98.2% of Missouri |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | None beyond ember reach |
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 | OFALLON PWS serves 32,515 people · EPA ID MO6010588 |
|---|---|
| Water Source | Purchased surface water from several systems |
| Last State Inspection | Aug 2024 |
| Lead | 2 ppb (2023–2025) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | 1 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.
Source: FCC Broadband Data Collection, based on 280 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Gateway Fiber Fiber | 2,000 / 2,000 |
| Spectrum Cable · Fiber in parts of the area | 1,000 / 1,000 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: Wisper ISP.
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