Pennington County property record for 403 Swanzey St, Keystone, SD 57751
| Property Type | Mobile Home |
|---|---|
| Details | 4,356 sqft · built 1977 |
| Lot Size | 0.18 acres (7,841 sqft) |
| Owner | 2 Individual Names on File |
| Tax Bill | $720 (2025) |
| Flood Zone | Zone AE (high risk) |
| APN | 70-08-280-001 |
| Primary APN | 70-08-280-001 |
|---|---|
| Alternative APN |
|
| Building Area | 4,356 sqft Living Area |
|---|---|
| Gross Area | 2,401 sqft |
| Year Built | Built 1977 |
|---|---|
| Effective Year Built | Effective 1977 |
| Architectural Style | Mobile/Manufactured |
| Lot Area | 7,841 sqft (0.18 acres) |
| Total Buildings | 2 Buildings |
| Account Number | 9452 |
|---|---|
| Street Address | 403 SWANZEY ST |
| City | KEYSTONE |
| State | SD |
| Zip | 57751-2024 |
| Property Category | Residential |
| Property Type | Residential > Prefabricated > Mobile Home |
| Legal Description | SWANZEY ADD, BLOCK 2, LOT 1 - 2 |
| Legal Subdivision | SWANZEY ADD |
| Legal Block | 2 |
| Legal Lot Number | 1-2 |
| Jurisdiction | PENNINGTON SD |
| Township / Civil Division | KEYSTONE |
| Census Block Group | 1 |
| Census Block | 1064 |
| Census Tract | 11005 |
Source: Pennington County records, as of September 14, 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 | 23809 GOLDEN HILLS DR, RAPID CITY, SD 57702-7409 |
| Owner Type | Individual |
| Deed Names | 2 Names on Deed |
|---|---|
| Record Updated | Oct 29, 2026 |
Source: Pennington County assessment roll, as of September 14, 2026
| Type | Name |
|---|---|
| State | South Dakota |
| County | Pennington County |
| Municipality | Keystone Town |
| Unified School District | Hill City School District 51-2 (PK - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $73,700 (+9.02%) Land $40,900 Building $32,800 | |
| 2025 | $720.00 (-11.55%) | $67,600 (+7.64%) Land $39,900 Building $27,700 |
| 2023 | $814.00 (+37.5%) | $62,800 Land $39,900 Building $22,900 |
| 2022 | $592.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
Source: FEMA National Flood Hazard Layer, effective June 11, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone AE high risk |
|---|---|
| 100-Year Floodplain | Yes 1% annual chance |
| Floodway | Yes |
| Base Flood Elevation | Varies along the reach; see FIRM |
| Flood Insurance Requirement | Required federally backed loans |
| Flood Insurance Cost | Premium on File median of 17 policies |
| Nearby Flood Policies | 17 in force |
| Nearby Flood Claims | 3 (1995–2001) |
| Claims Outside the SFHA | 2 of 3 |
| Most Recent Claim | Jul 2001 · river or lake 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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | High above 71% of the US · above 81% of South Dakota |
|---|---|
| Wildfire Likelihood | 0.3% 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 | KEYSTONE serves 349 people · EPA ID SD4601082 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Oct 2024 |
| Lead | 2 ppb (2025) 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 40 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Starlink Satellite | 280 / 30 |
| TSC DSL · Fiber in parts of the area | 100 / 20 |
May also be available: AT&T, T-Mobile, Verizon.
5G (outdoors only) and 4G LTE
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