Johnsonburg is an unincorporated area within Frelinghuysen Township in Warren County, New Jersey, United States. The area is served as United States Postal Service ZIP Code 07846. Although the Post Office there has closed.
The Johnsonburg Historic District is listed in the National Register of Historic Places
As of the United States 2000 Census, the population for ZIP Code Tabulation Area 07846 was 59.
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