What to know about ZIP 07820
ZIP code 07820 covers Allamuchy, NJ in Warren County.
It sits in telephone area code 908; U.S. House district NJ-7; the NEW YORK media market.
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Allamuchy CDP, NJ
ZIP Code 07820 — Allamuchy CDP, NJ Demographics & Data
Source: U.S. Census Bureau ACS 2019–2023 5-Year Estimates. Page data updated 2026-08-02.
Low Snow Area
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At a glance
Overview of ZIP Code 07820
Climate risk and migration signals
FEMA’s National Risk Index rates natural-hazard risk for Allamuchy CDP, NJ as Relatively Low (composite score 80.8), which is elevated versus much of the country. The strongest component scores on US5 are flood (86.5) and hurricane (79.9). 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 Allamuchy CDP, NJ show little to no average snow and around 48.8 inches of annual precipitation.
Nearby (from this ZIP)
Airport MMU (22.7 miles (36.5 km)) · Centenary University (5.9 miles (9.5 km)) · Delaware Water Gap National Recreation Area (15.3 miles (24.7 km)) · VA: Sussex Outpatient Clinic (8.7 miles (14.0 km))
Full lists and map pins are in the Infrastructure section below.