St. Charles County property record for 503 Mardell Dr, O Fallon, MO 63366
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 988 sqft · built 1963 |
| Lot Size | 0.261 acres (11,360 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $49,600 (Mar 2013) |
| Tax Bill | $2,168 (2024) |
| Flood Zone | Zone X (minimal risk) |
| APN | 323730A000 |
| Primary APN | 323730A000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 988 sqft Living Area |
| Gross Area | 2,496 sqft |
| 1st Floor Area | 988 sqft |
| Basement Area | 988 sqft |
| Year Built | Built 1963 |
|---|---|
| Effective Year Built | Effective 1963 |
| Architectural Style | Ranch |
| Exterior Material | Combination |
| Roof Type | Gable |
| Roof Material | Asphalt |
| Lot Area | 11,360 sqft (0.261 acres) |
| Lot Dimensions | 160 ft deep x 71 ft wide |
| Garage Type | Attached |
| Garage Area | 520 sqft |
| Parking Spaces | 2 Parking Spaces |
| Porch | Open Porch |
|---|---|
| Porch Area | 90 sqft |
| Deck Area | Deck Area |
| Patio Area | 368 sqft |
| Cooling System | HVAC |
|---|---|
| Heating System | Forced Air with A/C |
| Account Number | 323730A000 |
|---|---|
| Street Address | 503 MARDELL DR |
| City | O FALLON |
| State | MO |
| Zip | 63366-1336 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | AA1 |
| Legal Description | LAKE CHAS HILLS #2 BLK 7 LOT 2 |
| Legal Subdivision | LAKE CHAS HILLS #2 |
| Legal Block | 7 |
| Legal Lot Number | 2 |
| Jurisdiction | ST CHARLES MO |
| Township / Civil Division | WENTZVILLE |
| Census Block Group | 1 |
| Census Block | 1020 |
| Census Tract | 311801 |
503 Mardell Dr is owned and occupied by two individuals who acquired it in May 2015.
Source: St. Charles County records, as of August 7, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 503 MARDELL DR, O FALLON, MO 63366-1336 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
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 |
|---|---|
| Last Sale | Mar 29, 2013 · Amount on File |
| Deed Sale | Mar 29, 2013 · Amount on File |
| Prior Sale | Nov 6, 2012 |
| Deed Document Number | 2013249800 |
| Deed Book / Page | 5986 / 2401 |
| Last Transfer Date | May 9, 2015 |
| Transfer Doc | 0063530236 |
| Record Updated | Oct 29, 2026 |
Source: St. Charles County assessment roll, as of August 7, 2026
| Type | Name |
|---|---|
| State | Missouri |
| County | St. Charles County |
| Unified School District | Fort Zumwalt R-II School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $37,815 (-) | $199,026 (-) Land $50,000 Building $149,026 | |
| 2025 | $37,815 | $199,026 Land $50,000 Building $149,026 | |
| 2024 | $2,168.00 | ||
| 2023 | $35,525 | ||
| 2022 | $186,976 Land $50,000 Building $136,976 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 503 Mardell Dr in Zone X, an area of minimal flood risk, though there have been 42 flood claims nearby since 1979.
Source: FEMA National Flood Hazard Layer, effective August 25, 2024 · 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 |
| Community Rating System | Class 6 (20% premium discount) |
| Nearby Flood Policies | 5 in force |
| Nearby Flood Claims | 42 (1979–2022) |
| Claims Outside the SFHA | 6 of 42 |
| Most Recent Claim | Jul 2022 · Severe Storms And Flooding |
| Claims by Event |
|
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 Mardell Dr 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 67% of the US · lower than 78% of Missouri |
|---|---|
| Wildfire Likelihood | 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 138 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Gateway Fiber Fiber | 2,000 / 2,000 |
| Spectrum Cable | 1,000 / 1,000 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: Wisper ISP.
5G (outdoors only) and 4G LTE
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