The smallest of the Middle Atlantic States, New Jersey is ranked 46th in size among the 50 states in the US. New Jersey covers a total area of 7,787 sq mi (20,168 sq km) of which 7,468 sq mi (19,342 sq km) constitute land and 319 sq mi (826 sq km) comprises of inland water.

New Jersey is surrounded by New York State on the North and North East; by the Atlantic Ocean on the East; by Delaware on the South and Southwest; and by Pennsylvania on the West. The Atlantic Coast also constitutes of several barrier islands.

The state's geographic center is in Mercer County, near Trenton.