The National Park Service identifies 18 historic sites within national park units in New York State, and lists these together with the NHLs in the state, and there are also two National Historic Sites that are "affiliated areas," receiving National Park Service support but not directly administered by it. Seven of the 20 were declared National Historic Landmarks, in several instances before receiving the higher protection designation, and retain their NHL standing. Four of these are listed above and three are included within the New York City list of NHLs. The 13 others are: