State · DE
Delaware — neighborhood data
ZIP-level federated summaries available in Delaware today. Full state coverage lands as the data-ingestion layer keeps rolling out.
Last verified 2026-09-24
Delaware top concern
Sea-level rise, agricultural runoff
Delaware has the lowest mean elevation of any US state and FEMA NFHL coverage extends well inland in Sussex County. Agricultural runoff in poultry-heavy regions affects EPA SDWIS small-system nitrate readings. Lead-service-line inventories statewide are nearing 2024 LCRR baseline.
See methodology for source citations + refresh cadence per dataset.
Verdict
Across the 4 Delaware ZIPs zipradar carries, 3 of the 12 dimensions carry measured values today: radon — 3 in Zone 2 (moderate), 1 in Zone 3 (lowest); air quality — median day Good across 4 with 2025 county data; drinking water — no health-based violations across the 4 matched to an EPA SDWIS system. The rest are per-ZIP lookups that populate as ingestion reaches each source — open a ZIP below rather than reading a state average.
4 ZIP codes live
Browse Delaware ZIPs by topic
Pick a topic to dive deeper across Delaware addresses. Each topic page explains the source, refresh cadence, and limitations.
EPA SDWIS
Water quality
FEMA NFHL
Flood zone
USDA Forest Service
Wildfire risk
EPA Air Quality System (AQS), annual county summary
Air quality
FBI UCR
Crime
NCES Common Core of Data
Schools
EPA Radon Zones
Radon
EPA LCRR + RTI National Lead Pipe Map
Lead pipes
County assessors
Property tax
County recorders
Deed activity
Municipal planning departments
Zoning
NSOPW (federal deep-link)
Sex offender registry
Delaware counties
County-level rollups for property tax, deeds, and EPA radon zones.
Browse Delaware counties →Frequently asked questions
How many ZIP codes does zipradar cover in Delaware?
4 ZIP codes are live in Delaware today, and coverage keeps expanding toward the full 41,000+ US ZIP set. Each ZIP page federates 12 dimensions: water, flood, wildfire, crime, schools, radon, air, lead, property tax, deeds, zoning, and sex-offender registry.
What is the top neighborhood-data concern in Delaware?
Sea-level rise, agricultural runoff. Delaware has the lowest mean elevation of any US state and FEMA NFHL coverage extends well inland in Sussex County. Agricultural runoff in poultry-heavy regions affects EPA SDWIS small-system nitrate readings. Lead-service-line inventories statewide are nearing 2024 LCRR baseline.
What data sources does zipradar use for Delaware?
EPA SDWIS (drinking water), FEMA NFHL (flood), FBI UCR + Crime Data Explorer (crime), NCES CCD (schools), USFS (wildfire risk), EPA Map of Radon Zones, plus Delaware county assessors and recorders for property tax + deeds. See /methodology for what's covered per source and refresh cadence.
Where can I see county-level data for Delaware?
Delaware county dashboards roll up property tax (assessor), deeds (recorder), and EPA radon zones at the county tier. Browse /county/de/ for the full county index — coverage matches ZIP rollout schedule.
Delaware-specific data sources
zipradar federates state-level data from EPA SDWIS (drinking water), FEMA NFHL (flood), FBI UCR (crime), NCES CCD (schools), plus county assessors and recorders where published. See the methodology page for the full source list and refresh cadence.