Geographic Coverage
Coverage varies by data product. All endpoints accept addresses anywhere in the United States, but will return partial or empty data for locations outside the covered area.
Coverage by endpoint
| Endpoint | Coverage |
|---|---|
| Property AVM | Contiguous United States (varies by local market data density) |
| Rental AVM | Contiguous United States (varies by local rental listing density) |
| Multifamily AVM | Major metro areas and markets with sufficient multifamily sale history |
| Flood Zone | Contiguous United States (FEMA DFIRM mapped areas) |
| Fire Risk | Contiguous United States |
| Storm Surge | Atlantic and Gulf Coast counties at hurricane risk |
| Census Data | Entire United States (all 50 states + D.C.) |
| Crime Data | Jurisdictions participating in FBI NIBRS reporting |
| Socioeconomic Indices | Entire United States (block group through county) |
| Natural Hazards | Entire United States (tract and county levels) |
AVM coverage notes
AVM accuracy is a function of local comparable sale density. Urban and suburban markets with active MLS data produce tighter confidence intervals. Rural areas, very high-end properties, or markets with infrequent sales will have wider confidence intervals.
The confidence_interval_95 in the AVM response reflects model uncertainty at the specific location and price point — a wide interval is a signal that the local market has limited comparable data.
Flood zone coverage notes
FEMA DFIRM mapping covers areas where flood risk studies have been completed. Some rural areas may be mapped with older, less detailed methods (Zone A without Base Flood Elevation) or may not have been studied at all. FEMA's Flood Map Service Center is the authoritative source for the most current FIRM maps.
Storm surge coverage notes
Storm surge data is available only in coastal areas modeled by NOAA's SLOSH system — primarily Atlantic and Gulf of Mexico coastal counties. Locations without storm surge risk (inland areas) return in_surge_zone: false.
Crime data coverage notes
NIBRS participation is voluntary at the agency level. Major cities and suburban law enforcement agencies generally participate; some rural and tribal jurisdictions do not. The absence of crime records for a location should not be interpreted as "zero crime" — it may mean the reporting agency does not submit to NIBRS.