ZIP 20850 · Maryland
Rockville, MD — neighborhood data
Federated public-records summary for ZIP 20850. Each dimension below will populate with live data from its primary regulator as ingestion lands this week. Every claim cites its source; see methodology for refresh cadence.
Last verified 2026-04-24 · methodology
Water quality
Source: EPA SDWIS
Drinking-water violations and lead/copper results for the community water system.
Water quality for Rockville →
Flood zone
Source: FEMA NFHL
Official FIRM flood-zone classification and base flood elevation.
Flood zone for Rockville →
Wildfire risk
Source: USDA Forest Service
Community-level hazard potential on a five-step scale.
Wildfire risk for Rockville →
Air quality
Source: EPA AirNow
Current AQI plus multi-year averages from the nearest monitoring station.
Air quality for Rockville →
Crime
Source: FBI UCR
Reported crime per 100,000 residents, normalized across years and agencies.
Crime for Rockville →
Schools
Source: NCES Common Core
District boundary, enrollment, student-teacher ratio, and demographics.
Schools for Rockville →
Radon
Source: EPA Radon Zones
County-level radon risk zone (1/2/3) with state-level testing context.
Radon for Rockville →
Lead pipes
Source: EPA LCRR / RTI
Lead service line counts reported by the utility under the 2024 federal rule.
Lead pipes for Rockville →
Property tax
Source: County assessor
Millage rates and assessment methodology where published.
Property tax for Rockville →
Deed activity
Source: County recorder
Recent deed transfers aggregated by zip, never by homeowner name.
Deed activity for Rockville →
Zoning
Source: Municipal planning
Residential, commercial, industrial, and mixed-use classifications.
Zoning for Rockville →
Sex offender registry
Source: NSOPW (federal · deep-link only)
zipradar does not cache or republish any sex-offender registry records. Use the Department of Justice's National Sex Offender Public Website for official searches.
Search NSOPW for Rockville, MD →Opens on nsopw.gov. Personal records are never mirrored here.
Montgomery County (MD), MD
ZIP 20850 is in Montgomery County (MD). County-level data anchors property tax (assessor), deeds (recorder), and the EPA Map of Radon Zones.
Montgomery County (MD) dashboard →Why ZIP 20850?
Rockville, Maryland 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.