Penwell is an unincorporated community located within Lebanon Township in Hunterdon County, in the U.S. state of New Jersey. Penwell is a community in the north of Lebanon Township that was also most northern settlement in Hunterdon County. It was known as Penwell dating back to 1866 and was named after the Penn Well Mills on the Musconetcong River. When the property of Sylvanus Hoffman was advertised for sale in 1886, the village was described as being on the Washington Turnpike (now Route 57) and his land "along a stream". The Miller Farmstead, nearby, is listed on the National Register of Historic Places, and includes a historic stone arch bridge over the Musconetcong River.national Register of Historic Places Inventory - Nomination Form for Miller Farmstead
National Park Service. Accessed June 28, 1998. "The Miller Farmstead is a mostly 19th-century assemblage overlooking the Musconetcong River just north of Penwell at the intersection of Route 57 and Watters Road."

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