Montgomery County property record for 4 Keystone Ct, Gaithersburg, MD 20878
| Property Type | Single Family Home |
|---|---|
| Details | 3 ba · 2,156 sqft · built 1974 |
| Lot Size | 0.218 acres (9,507 sqft) |
| Owner | Individual Name on File |
| Last Sale | $436,000 (May 2010) |
| Tax Bill | $6,143 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 09-01521531 |
| Primary APN | 09-01521531 |
|---|---|
| Alternative APN |
|
| Full Baths | 3 Baths |
|---|---|
| Stories | 2 Stories |
| Building Area | 2,156 sqft Living Area |
| 1st Floor Area | 1,452 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1974 |
|---|---|
| Effective Year Built | Effective 1974 |
| Architectural Style | Bi-Level |
| Exterior Material | Combination |
| Construction Type | Frame |
| Roof Material | Composition Shingle |
| Lot Area | 9,507 sqft (0.218 acres) |
| Porch | Open Porch |
| Porch Area | 348 sqft |
| Cooling System | Central |
|---|---|
| Heating System | HVAC |
| Sewer | Municipal |
| Account Number | 01521531 |
|---|---|
| Street Address | 4 KEYSTONE CT |
| City | GAITHERSBURG |
| State | MD |
| Zip | 20878-1880 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R90 |
| Legal Description | WEST RIDING |
| Legal Subdivision | WEST RIDING |
| Legal Block | C |
| Legal Lot Number | 58 |
| Jurisdiction | MONTGOMERY MD |
| Township / Civil Division | 9 |
| Census Block Group | 1 |
| Census Block | 1000 |
| Census Tract | 700823 |
4 Keystone Ct is owned and occupied by an individual who bought it in May 2010.
Source: Montgomery County records, as of August 17, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 4 KEYSTONE CT, GAITHERSBURG, MD 20878-1880 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Sole Owner |
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 | Name on Deed |
|---|---|
| Last Sale | May 25, 2010 · Amount on File |
| Deed Sale | May 25, 2010 · Amount on File |
| Deed Document Number | 2010164034 |
| Record Updated | Sep 20, 2026 |
The 2025 property tax bill for 4 Keystone Ct was $6,143.
Source: Montgomery County assessment roll, as of August 17, 2026
| Type | Name |
|---|---|
| State | Maryland |
| County | Montgomery County |
| Municipality | Gaithersburg City |
| Unified School District | Montgomery County Public Schools (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $521,400 (+5.79%) Land $216,600 Building $304,800 | $521,400 (-) Land $216,600 Building $304,800 | |
| 2025 | $6,143.00 | $492,867 | $521,400 Land $216,600 Building $304,800 |
| 2023 | $435,800 Land $216,600 Building $219,200 | $435,800 Land $216,600 Building $219,200 | |
| 2022 | $5,030.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 4 Keystone Ct in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 1979.
Source: FEMA National Flood Hazard Layer, effective April 12, 2026 · 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 | 4 in force |
| Nearby Flood Claims | 1 (1979) |
| Most Recent Claim | Oct 1979 · tidal / storm surge |
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 4 Keystone 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 95% of the US · lower than 90% of Maryland |
|---|---|
| Wildfire Likelihood | Under 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 | WASHINGTON SUBURBAN SANITARY COMMISSION serves 1,900,000 people · EPA ID MD0150005 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | May 2025 |
| Lead | Under 1 ppb (2018–2020) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None 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 434 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Verizon Fiber | 2,300 / 2,300 |
| Xfinity Cable | 2,000 / 250 |
| Astound Broadband Cable | 1,500 / 50 |
| T-Mobile Fixed Wireless | 100 / 20 |
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