Sussex County, Delaware

Sussex County covers 936 square miles of land. Below is what the Isopleth API returned at the Census Bureau's interior point for the county (38.67323, -75.33702) on 2026-10-29. The ground sits at 13 m (42 ft) on a 0.5° slope, the mapped soil is moderately well drained, it is outside a mapped FEMA floodplain, the nearest 69 kV+ substation is 4.5 km (2.8 mi) away and a major road is 1.5 km (0.9 mi) away. Values describe that one point, not the whole county; look up your own address or coordinates for your site.

Sample point values

Fields with no data at this point are left out. See the field catalog for all 351 fields.

Parcels

Parcel records: 454,607 parcels in 3 counties. Sussex County has 167,619 of them. 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.

The parcel under the sample point is 300.9 acres. parcel_enrich returns that record for any parcel you ask about, and parcel_search finds parcels by acreage, land use or value.

Look up your own site

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 through the MCP server: “Using Isopleth, check flood zone, wetlands, soils and distance to power for [your address in Sussex County, Delaware].”

Buying land here? Check the Land’s Sussex County page shows what its $29 report checks, built on these same Isopleth fields.

More in Delaware: Kent County · New Castle County · Delaware overview · all states