ZIP Code 07840

07840 is one of New Jersey's ZIP codes, delivering to addresses in Hackettstown, Warren County.

City: Hackettstown
County: Warren County
State: New Jersey
Prefix: 078xx

Where this code sits

07840 is part of the 078xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Hackettstown.

Hackettstown New Jersey ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 07840 delivers to without sharing its boundary.

908 Area code 908

ZIP codes nearest 07840

The ZIP codes whose reference points sit closest to 07840.
ZIP code	Distance	Delivers to
ZIP code 07880	3.4 mi	Vienna, NJ
ZIP code 07870	3.9 mi	Schooleys Mountain, NJ
ZIP code 07820	4.9 mi	Allamuchy, NJ
ZIP code 07828	5.0 mi	Budd Lake, NJ
ZIP code 07853	5.1 mi	Long Valley, NJ
ZIP code 07838	5.6 mi	Great Meadows, NJ
ZIP code 07865	6.1 mi	Port Murray, NJ
ZIP code 07836	6.9 mi	Flanders, NJ

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 07840, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 07840. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.