County · DE
New Castle County, DE
ZIP-level federated summaries inside New Castle County, Delaware. zipradar pulls property tax (county assessor), deeds (county recorder), water quality (EPA SDWIS), flood zones (FEMA NFHL), schools (NCES CCD), and crime (FBI UCR) at the county and ZIP level.
Last verified 2026-06-10 · methodology
3 ZIP codes live in New Castle County
Browse New Castle County by topic
EPA SDWIS
Water quality
FEMA NFHL
Flood zone
USDA Forest Service
Wildfire risk
EPA AirNow
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 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 Delaware state page for the full state-level rollup, plus all Delaware counties.
Frequently asked questions
How many ZIP codes does zipradar cover in New Castle County, DE?
3 ZIP codes are live in New Castle County, Delaware today. Each ZIP page federates property tax (New Castle County assessor), deeds (New Castle County recorder), drinking water (EPA SDWIS), flood (FEMA NFHL), schools (NCES CCD), and crime (FBI UCR).
What data sources does zipradar use for New Castle County County?
Property tax + assessed values come from the New Castle County County Assessor's office. Deed activity comes from the New Castle County County Recorder. Zoning is sourced from county planning records. State-level overlays: EPA SDWIS (water), FEMA NFHL (flood), FBI UCR (crime), NCES CCD (schools), EPA Map of Radon Zones. Refresh cadence varies — see /methodology.
How are property tax and deeds different in New Castle County?
Property tax records are maintained by the New Castle County County Assessor (annual cycle, typically). Deeds are recorded by the New Castle County County Recorder (real-time on transaction). zipradar surfaces both at the ZIP level so you can spot assessment-vs-sale-price gaps and recent deed activity. See /learn for the full office-distinction explainer.
Does New Castle County have flood or wildfire risk?
Flood risk is mapped at the ZIP and parcel level via FEMA NFHL (National Flood Hazard Layer). Wildfire risk uses USFS Wildfire Risk to Communities data. Browse the per-ZIP pages above for New Castle County-specific exposure scores — each cites the FEMA flood-zone code (A, AE, X, etc.) or USFS risk percentile.
Read more on county-level data
How property tax, deeds, zoning, and schools work at the county level — the office distinctions, what data lags, and what each record actually means.
FBI UCR and NIBRS — what crime statistics actually show (and don't)
The FBI's Uniform Crime Reporting (UCR) program and its successor NIBRS aggregate crime data from local agencies. Plain-English guide to what gets reported, what doesn't, and how to read the numbers.
Lead and Copper Rule 2024 — the federal lead-pipe inventory mandate
The 2024 Lead and Copper Rule Revisions (LCRR) require every US community water system to inventory and report lead service lines. Plain-English guide.
Property tax millage — what 'mill' means and how your bill is computed
Plain-English guide to property tax millage rates, assessment ratios, and homestead exemptions. How county assessors compute your annual property tax bill.
School district boundaries — how to confirm yours and why it matters
How school district boundaries work, where to find them, and why the same street can split between two districts.
Deed records — what they show and what they don't
Plain-English guide to county deed records: what gets filed, how to look up a property's history, and why zipradar aggregates only counts (never owner names).
Zoning codes — what R-1, C-2, M-1, MU mean and why your house is one
Plain-English guide to common US zoning codes: R-1 / R-2 / C-1 / C-2 / M-1 / MU. Why zoning matters for your home, your neighbors, and what you can build.