ZIP Code 08858

08858 is one of New Jersey's ZIP codes, delivering to addresses in Oldwick, Hunterdon County.

City: Oldwick
County: Hunterdon County
State: New Jersey
Prefix: 088xx

Where this code sits

08858 is part of the 088xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Oldwick.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 08858 delivers to without sharing its boundary.

908 Area code 908

ZIP codes nearest 08858

The ZIP codes whose reference points sit closest to 08858.
ZIP code	Distance	Delivers to
ZIP code 07979	2.3 mi	Pottersville, NJ
ZIP code 08888	3.7 mi	Whitehouse, NJ
ZIP code 08889	4.2 mi	Whitehouse Station, NJ
ZIP code 08833	4.6 mi	Lebanon, NJ
ZIP code 07830	4.7 mi	Califon, NJ
ZIP code 07931	5.3 mi	Far Hills, NJ
ZIP code 07934	5.3 mi	Gladstone, NJ
ZIP code 07977	5.5 mi	Peapack, 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 08858, plotted from its record coordinates.

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

Scope ZIP code 08858. 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.