Stoutsburg is an unincorporated community located along the border of Hopewell Township in Mercer County and Montgomery Township in Somerset County, in the U.S. state of New Jersey.

Province Line Road follows the Keith line which formerly separated the provinces of West Jersey and East Jersey, now parts of Hopewell and Montgomery townships respectively.

On June 24, 1778, during the American Revolutionary War, General George Washington held a council of war at the Joseph Stout House (Hunt House) located here in preparation for the Battle of Monmouth.

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