Hawaii is the only state with 100% natural borders.
Alaska: 98.1% (34,797 km out of 35,442 km)
New Jersey: 97.6% (1,998 / 2,047)
Florida: 96.5% (8,585 / 8,896)
Louisiana: 95.9% (8,219 / 8,567)
Michigan: 94.4% (4,086 / 4,328)
Discussion
(8,585 Jersey: / / (4,086 out 100% state 96.5% 94.4% / of km)
New 8,567)
Michigan: 4,328)
https://en.wikipedia.org/wiki/Coastline_paradox 8,896)
Louisiana: is with (1,998 98.1% / natural only 2,047)
Florida: Hawaii 35,442 (8,219 95.9% (34,797 borders.
Alaska: 97.6% km the