Map and history ofHow New Jersey's counties were createdIt should be noted that the map and history provide a general overview and do not take into consideration smaller changes in boundaries between counties that have occurred. Early county boundaries along relatively uninhabited areas were not always definitively established. 
1694: NJ consists of 9 counties1714: Hunterdon County is formed from Burlington, consisting of the current lands of Hunterdon, Morris, Sussex, Warren, and part of Mercer County 1739: Morris County formed from Hunterdon, consisting of the current lands of Morris, Sussex and Warren counties 1748: Cumberland County formed from Salem 1753: Sussex County formed from Morris, consisting of the current lands of Sussex and Warren counties 1824: Warren County formed from Sussex 1837: Passaic County formed from parts of Bergen and Essex counties 1837: Atlantic County formed from Gloucester 1838: Mercer County formed from parts of Burlington, Hunterdon, and Middlesex counties 1840: Hudson County formed from Bergen 1844: Camden County formed from Gloucester 1850: Ocean County formed from Monmouth 1857: Union County formed from Essex
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