Rosemont is an unincorporated community located within Delaware Township in Hunterdon County, New Jersey, United States. Its ZIP c…Rosemont is an unincorporated community located within Delaware Township in Hunterdon County, New Jersey, United States. Its ZIP code is 08556. Located at the top of a small hill, the center of the community is located along Kingwood Stockton Road near its intersections with Raven Rock Rosemont Road and Rosemont Ringoes Road. Farmland and residences make up the surrounding area while the center of the settlement includes residences, a post office, and an antique shop.
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