) [ 4 ] -  Density 1,185/sq mi  (458/km 2 ) Ranked 1st in the US  -  Median income   $70,378 (2nd) Elevation    - Highest point High Point [ 5 ] 1,803 ft  (550 m)  - Mean 246 ft  (75.2 m)  - Lowest point Atlantic Ocean [ 5 ] 0 ft  (0 m) Before statehood Province of New