States / Delaware
Delaware location data
Isopleth answers questions about any coordinate or street address in Delaware with 351 public-data fields from 95 sources: flood and wildfire risk, soils and slope, the power grid, water and roads, climate, and county economics. Each value carries its source, license and vintage. Use it from the REST API or through the MCP server in Claude, ChatGPT, Cursor and other assistants.
Parcel coverage in Delaware
Parcel records: 454,607 parcels in 3 counties. Published by Delaware FirstMap; county governments (Public, attribution); Updated 2026-10-01, refreshed quarterly.
Not published here: owner name, site address, total value, land use, sale date, zoning, year built.
Sample values in Delaware
What our API returned at the Census Bureau's interior point of Delaware's 3 largest counties by land area, computed 2026-10-29. One point is not a whole county: values can change within a few hundred meters, so look up your own site. "No data" means the dataset has nothing at that point.
| field | Sussex County | Kent County | New Castle County |
|---|---|---|---|
| Hazards | |||
| FEMA flood zone | X | X | X |
| Inside a mapped floodplain | No | No | No |
| Wildfire, annual frequency | 0.00090 events a year | 0.0011 events a year | 0.00044 events a year |
| Tornado, annual frequency | 0.0031 events a year | 0.0022 events a year | 0.0070 events a year |
| Hail, annual frequency | 0.58 events a year | 1.7 events a year | 2.2 events a year |
| Current drought category | no data | D0 | no data |
| On a mapped wetland | No | No | No |
| Nearest mapped wetland | 87 m | 55 m | 128 m |
| Land | |||
| Elevation | 13 m (42 ft) | 7 m (24 ft) | 13 m (41 ft) |
| Slope | 0.5° | 1.4° | 5.8° |
| Soil drainage | Moderately well drained | Well drained | Well drained |
| Soil hydrologic group | A | A | B |
| Farmland class | Prime if conditions met | Statewide importance | Statewide importance |
| Land use | Forest | Agriculture | Forest |
| Crop or cover (CDL) | Woody Wetlands | Corn | Grass/Pasture |
| Dominant crop, 5 years | no data | Corn | no data |
| Tree canopy | 87% | 26% | 16% |
| On protected land (PAD-US) | No | No | No |
| Surface manager | Private or unknown | Private or unknown | Private or unknown |
| Climate & energy | |||
| Annual precipitation (normal) | 1,178 mm (46 in) | 1,145 mm (45 in) | 1,179 mm (46 in) |
| Days above 32 °C a year | 25 days | 21 days | 21 days |
| Solar resource (GHI) | 4.24 kWh/m²/day | 4.35 kWh/m²/day | 4.28 kWh/m²/day |
| Mean wind speed at 100 m | 6.6 m/s | 6.9 m/s | 6.7 m/s |
| Wind capacity factor | 37% | 38% | 35% |
| Infrastructure | |||
| Nearest transmission line | no data | no data | 877 m |
| Nearest substation (69 kV+) | 4.5 km (2.8 mi) | 3.6 km (2.3 mi) | 2.3 km (1.4 mi) |
| Nearest gas pipeline | 1.9 km (1.2 mi) | 1.2 km (0.8 mi) | 193 m |
| Electric utility | DELAWARE ELECTRIC COOPERATIVE | CITY OF DOVER - (DE) | DELMARVA POWER |
| In a public water service area | No | No | No |
| Depth to water, nearest monitored well | 2.1 m (7 ft) | 3.0 m (10 ft) | 9.4 m (31 ft) |
| Nearest major road | 1.5 km (0.9 mi) | 394 m | 507 m |
| Nearest FCC antenna structure | no data | no data | 1.3 km (0.8 mi) |
| Community | |||
| Nearest fire station | 4.5 km (2.8 mi) | 3.7 km (2.3 mi) | 4.0 km (2.5 mi) |
| Nearest hospital | 3.8 km (2.3 mi) | 3.5 km (2.2 mi) | 6.9 km (4.3 mi) |
| Nearest school | 3.1 km (1.9 mi) | 810 m | 1.8 km (1.1 mi) |
| County median household income | $81,497 | no data | no data |
| County population growth, 1 year | +2.2% | no data | no data |
| County house prices, year over year | +5.3% | no data | no data |
| In an Opportunity Zone | No | No | No |
County pages
- Sussex County 936 sq mi of land
- Kent County 586 sq mi of land
- New Castle County 426 sq mi of land
Datasets that returned data at these points
| source | fields |
|---|---|
BLM_SMA Bureau of Land Management | surface_management_agency |
CENSUS_ACS U.S. Census Bureau | county_median_household_income |
CENSUS_PEP U.S. Census Bureau | county_population_growth_1yr_pct |
EIA_ATLAS U.S. Energy Information Administration | nearest_gas_pipeline_distance_m, nearest_transmission_line_distance_m |
EIA_POWER U.S. Energy Information Administration | electric_utility_service_territory, nearest_substation_distance_m |
EPA_CWS_SERVICE_AREAS U.S. Environmental Protection Agency | within_water_service_area |
FCC_ASR Federal Communications Commission | nearest_antenna_structure_distance_m |
FEMA_NFHL Federal Emergency Management Agency | nfhl_flood_zone, within_floodplain_polygon |
FEMA_NRI Federal Emergency Management Agency | hail_annual_frequency, tornado_annual_frequency, wildfire_annual_frequency |
FHFA_HPI Federal Housing Finance Agency | county_hpi_yoy_pct |
GLOBAL_WIND_ATLAS_V3 See source_url | mean_wind_speed_100m_ms |
HUD_OPPORTUNITY_ZONES U.S. Department of Housing and Urban Development | in_opportunity_zone |
JRC_PVGIS_NSRDB See source_url | ghi_annual_kwh_m2_day |
NOAA_NCEI_NCLIMGRID_DAILY National Oceanic and Atmospheric Administration | days_above_32c_annual_count |
NOAA_NCEI_NORMALS_GRIDDED National Oceanic and Atmospheric Administration | annual_precipitation_normal_mm |
NREL_REV_LANDBASED_WIND_SC_2024 NREL reV supply curves, Open Energy Data Initiative (OEDI) | wind_capacity_factor_pct |
NREL_SOLAR_RESOURCE_V1 NREL Solar Resource Data (NSRDB) | ghi_annual_kwh_m2_day |
NREL_WIND_TOOLKIT NREL WIND Toolkit (Draxl et al., 2015) | mean_wind_speed_100m_ms |
OVERTURE_PLACES © Overture Maps Foundation | nearest_fire_station_distance_m, nearest_hospital_distance_m, nearest_school_distance_m |
OVERTURE_TRANSPORTATION © Overture Maps Foundation, © OpenStreetMap contributors | nearest_major_road_distance_m |
PAD_US USGS Protected Areas Database of the United States (PAD-US) | intersects_protected_area |
USDA_CDL U.S. Department of Agriculture | cdl_class, dominant_crop_5y |
USDA_SSURGO U.S. Department of Agriculture | prime_farmland_classification, soil_drainage_class, soil_hydrologic_group |
USDM_CURRENT The U.S. Drought Monitor is jointly produced by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the United States Department of Agriculture, and the National Oceanic and Atmospheric Administration. Map courtesy of NDMC. | drought_category |
USFS_LCMS USDA Forest Service | land_use_class |
USFS_NLCD_TCC USDA Forest Service | tree_canopy_pct |
USFWS_NWI U.S. Fish and Wildlife Service | intersects_wetland, nearest_wetland_distance_m |
USGS_3DEP_COG U.S. Geological Survey | elevation, slope_degrees |
USGS_NWIS_OGC U.S. Geological Survey | nearest_groundwater_well_depth_to_water_m |
These are only the sources behind the fields sampled here. The full list is on Sources & licenses and every field is in the field catalog.
What people use it for in Delaware
- Land buyers: screen a lot for flood zone, wetlands, slope, soils, road and water access before a site visit; search Delaware parcels by county, acreage or land use. Buyers who want it written up can order a $29 report on Check the Land, which is built on Isopleth.
- Solar, wind and data-center siting: distance to transmission and substations, solar and wind resource, protected land.
- Insurance and lending: hazard frequencies and floodplain status for every address in a book.
- Real estate and research: county income, growth and house-price trends next to on-the-ground facts.
See use cases for prompts and the exact fields.
Try it
curl https://api.isopleth.dev/v1/fetch -H "Authorization: Bearer $ISOPLETH_KEY" \
-H "Content-Type: application/json" \
-d '{"lat": 38.673227, "lng": -75.337024, "preset": "site_selection"}'
Or ask your assistant: “Using Isopleth, what are the flood zone, slope and soil drainage at 38.6732, -75.3370?”
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