What to know about ZIP 20661
ZIP code 20661 covers Cobb Island, MD in Charles County.
It sits in U.S. House district MD-5; the WASHINGTON, DC (HAGRSTWN) media market.
Cobb Island CDP, MD
ZIP Code 20661 — Cobb Island CDP, MD Demographics & Data
Source: U.S. Census Bureau ACS 2019–2023 5-Year Estimates. Page data updated 2026-08-02.
Map, Quick Facts & Location
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At a glance
Overview of ZIP Code 20661
Climate risk and migration signals
FEMA’s National Risk Index rates natural-hazard risk for Cobb Island CDP, MD as Relatively Low (composite score 44.1), which is near the middle of the national distribution. The strongest component scores on US5 are hurricane (78.0) and flood (50.6). These scores are county-linked NRI values published for planning context — all ZIP codes in the same county share the same composite score on US5. Useful when comparing insurance and disaster exposure across areas, not a substitute for a parcel-level flood or fire determination.
Climate normals for Cobb Island CDP, MD show limited published climate normals on US5.