U.S. States by Coastline

Which states have the longest coastline? Until now, there has been no accurate source for state coastlines. Wikipedia has two separate lists, both of which are very inaccurate. I decided to make a better list.

Methodology

This is based on original research by me, the JetPunk quizmaster. I wrote a script to calculate the coastline of each state based on this original data source from Natural Earth.

Notes

  • This does not include lakeshore
  • It does, however, include oceanic inlets such as Puget Sound and Chesapeake Bay
  • The length of coastline depends on the resolution of the data source. The higher the resolution, the longer the coastline.
  • The source data is not 100% perfectly accurate but it, is in my opinion, the best data source available
All U.S. States by Coastline
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Kilometers State
37,300 Alaska
4,850 Florida
2,740 California
2,600 Washington
2,590 North Carolina
2,440 Texas
2,350 Louisiana
1,820 Maryland
1,740 Maine
1,640 Virginia
1,450 Hawaii
1,190 New York
1,000 Massachusetts
812 Oregon
784 South Carolina
685 New Jersey
491 Georgia
325 Alabama
292 Rhode Island
277 Mississippi
239 Delaware
220 Connecticut
25 New Hampshire
0 Arizona
0 Arkansas
0 Colorado
0 Idaho
0 Illinois
0 Indiana
0 Iowa
0 Kansas
0 Kentucky
0 Michigan
0 Minnesota
0 Missouri
0 Montana
0 Nebraska
0 Nevada
0 New Mexico
0 North Dakota
0 Pennsylvania
0 Ohio
0 Oklahoma
0 South Dakota
0 Tennessee
0 Utah
0 Vermont
0 West Virginia
0 Wisconsin
0 Wyoming
+1
level 64
Apr 18, 2019
How did you get 39 km of coastline for PA? Neither the Chesapeake or Delaware Bays extend that far north.
+1
level ∞
Apr 19, 2019
Looks like our source map included part of the Delaware River, where it probably shouldn't have. I will adjust the data soon.
+1
level ∞
Apr 19, 2019
Okay, it's adjusted. A little tricky on where to draw the line between a river and an estuary.