Compare · MD · MD
ZIP 21202 vs ZIP 20815
Baltimore, MD compared to Chevy Chase, MD on twelve public-records dimensions sourced from EPA, FEMA, USDA, FBI, NCES, and county records. Each cell links to the per-ZIP topic page where the source citation and refresh cadence live.
Last verified 2026-09-24 · methodology
Verdict
On the 2 of 12 dimensions that carry measured values today, radon differs — 21202 is Zone 2, 20815 is Zone 1 (lower is less predicted potential); 2025 median air quality is Good in both (AQI 43 vs 39). zipradar names no overall winner: the other 10 dimensions are not populated yet, and these two are county-level indicators rather than address-level readings. Open either ZIP below for the source and refresh date behind each number.
Side by side
| Dimension | ZIP 21202 | ZIP 20815 |
|---|---|---|
| Water quality EPA SDWIS | Open water quality for 21202 → | Open water quality for 20815 → |
| Flood zone FEMA NFHL | Open flood zone for 21202 → | Open flood zone for 20815 → |
| Wildfire risk USDA Forest Service | Open wildfire risk for 21202 → | Open wildfire risk for 20815 → |
| Air quality EPA AirNow | Open air quality for 21202 → | Open air quality for 20815 → |
| Crime FBI UCR | Open crime for 21202 → | Open crime for 20815 → |
| Schools NCES Common Core | Open schools for 21202 → | Open schools for 20815 → |
| Radon EPA Radon Zones | Open radon for 21202 → | Open radon for 20815 → |
| Lead pipes EPA LCRR / RTI | Open lead pipes for 21202 → | Open lead pipes for 20815 → |
| Property tax County assessor | Open property tax for 21202 → | Open property tax for 20815 → |
| Deed activity County recorder | Open deed activity for 21202 → | Open deed activity for 20815 → |
| Zoning Municipal planning | Open zoning for 21202 → | Open zoning for 20815 → |
| Sex offender registry NSOPW (deep-link) | Open sex offender registry for 21202 → | Open sex offender registry for 20815 → |
Dimensions populate live as ingestion reaches each source. Every row will link to the primary regulator.
Maryland context
Chesapeake flood, lead pipes
Maryland has dense FEMA NFHL coverage along Chesapeake Bay tributaries. Baltimore City has extensive LCRR lead-service-line obligations and flagged EPA SDWIS compliance history. Radon Zone 1-2 across most counties.
Read more on cross-ZIP comparisons
Editorial deep-dives that help when reading two places side-by-side — what each data layer actually proves, and what it doesn't.
Flood zones explained — what AE, X, and VE actually mean
Plain-English guide to FEMA flood-zone codes (A, AE, AH, V, VE, X, X-shaded). What the 1% and 0.2% annual-chance zones mean for your property and your insurance.
EPA Radon Zones — what 1, 2, and 3 mean and when you should test
EPA classifies every US county into Zone 1 (high), Zone 2 (moderate), or Zone 3 (low) for radon. Plain-English guide to the classifications and at-home testing.
EPA AQI categories explained — what 0–50 Good through 301–500 Hazardous mean
Plain-English guide to the six EPA Air Quality Index categories: 0–50 Good, 51–100 Moderate, 101–150 Unhealthy for Sensitive Groups, 151–200 Unhealthy, 201–300 Very Unhealthy, 301–500 Hazardous — what each level means and who is at risk.
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.
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