ZIP 06820 · Connecticut
Neighborhood data for ZIP 06820 — Darien, Connecticut
Federated public-records summary for ZIP 06820. Twelve dimensions below — water, flood, wildfire, crime, schools, radon, air, lead, tax, deeds, zoning, sex-offender registry — each sourced from its primary federal or county regulator and refreshed on that regulator's cadence. Every claim cites its source; see methodology for refresh cadence and limitations.
Last verified 2026-05-13 · methodology
Water quality
Source: EPA SDWIS
Drinking-water violations, lead-copper results, and health alerts per community water system, sourced from EPA SDWIS and refreshed quarterly.
Water quality for Darien →
Flood zone
Source: FEMA NFHL
Official FIRM flood-zone classifications by address with base flood elevations, sourced from the FEMA National Flood Hazard Layer and refreshed quarterly.
Flood zone for Darien →
Wildfire risk
Source: USDA Forest Service
Community-level wildfire hazard potential on a five-step scale, sourced from USDA Forest Service Wildfire Risk to Communities and refreshed annually.
Wildfire risk for Darien →
Air quality
Source: EPA AirNow
Current AQI and multi-year averages from the nearest EPA AirNow monitoring station, per US ZIP code.
Air quality for Darien →
Crime
Source: FBI UCR
Reported crime per 100,000 residents, normalized across years and agencies, sourced from the FBI Crime Data Explorer.
Crime for Darien →
Schools
Source: NCES Common Core of Data
District boundary, enrollment, student-teacher ratio, and school demographics sourced from the NCES Common Core of Data.
Schools for Darien →
Radon
Source: EPA Radon Zones
County-level radon risk zone (1, 2, or 3) sourced from the EPA Map of Radon Zones, with state-level supplementary testing context.
Radon for Darien →
Lead pipes
Source: EPA LCRR + RTI National Lead Pipe Map
Lead service-line counts reported under the 2024 Lead and Copper Rule Revisions, sourced from EPA LCRR and RTI's national map.
Lead pipes for Darien →
Property tax
Source: County assessors
Millage rates and assessment methodology from county assessor offices, covering the top 50 US metros.
Property tax for Darien →
Deed activity
Source: County recorders
Recent deed-transfer counts aggregated to ZIP level, sourced from county recorder offices. Homeowner names are never cached or republished.
Deed activity for Darien →
Zoning
Source: Municipal planning departments
Residential, commercial, industrial, and mixed-use zoning classifications sourced from municipal planning departments.
Zoning for Darien →
Sex offender registry
Source: NSOPW (federal deep-link)
Deep-link to the Department of Justice's National Sex Offender Public Website (NSOPW). zipradar does NOT cache or republish registry records.
Sex offender registry for Darien →
Fairfield County, CT
ZIP 06820 is in Fairfield County. County-level data anchors property tax (assessor), deeds (recorder), and the EPA Map of Radon Zones.
Fairfield County dashboard →Why ZIP 06820?
Darien, Connecticut is one of the first six zip codes zipradar covers while the federation layer rolls out. Coverage expands to the top 500 zips by Week 2, full 41,000+ US zip codes by Month 2. Want your zip added sooner? Email us.