Closest US states that don't border each other

Some US states come very close to touching, but may fall short by a rat's whisker. Which pairs of states that live so close yet so far apart can you name? If you think that some of these distances don't sound that close, to give you an idea of scale, Maine is approximately 7,999 km away from Hawaii, a distance you could fit the length of Chile from north to south almost twice. To answer, just type the two states that you think may be almost neighbours in any order, e.g. type Florida-Alaska or Alaska-Florida if you think that's an answer (Hint: it isn't!)
These data come from my own research and may not be spectacularly accurate, but do report any errors or omissions.
Answers are pairs of states that do not share a land border (dubious maritime borders are excluded) measured by the shortest straight line distance between them.
Furthermore, the diametric Corner States are discounted as well.
Quiz by HelveticaBold
Last updated: October 12, 2016
First submittedOctober 12, 2016
Times taken64
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State pairs
19.18 km
Maryland - New Jersey
19.52 km
Connecticut - New Jersey
22.82 km
Michigan - Minnesota
24.88 km
Massachusetts - Maine
28 km
Pennsylvania - Virginia
34.37 km
Maine - Vermont
48.53 km
Delaware - Virginia
50 km
Iowa - Kansas
51.99 km
Arkansas - Kentucky
52.78 km
Colorado - Texas
Kansas - Texas
55.8 km
Arkansas - Kansas
56.55 km
Illinois - Tennessee
58.14 km
Illinois - Michigan
State pairs
59.35 km
New Hampshire - Pennsylvania
Arkansas - Oklahoma
New York - Ohio
65.62 km
Tennessee - West Virginia
66.47 km
New Hampshire - New York
68.51 km
North Carolina - West Virginia
72.04 km
Montana - Washington
73.35 km
Florida - Mississippi
77.03 km
Connecticut - New Hampshire
Connecticut - Vermont
77.42 km
New Hampshire - Rhode Island
80.13 km
Louisiana - Oklahoma
85.74 km
Kansas - New Mexico
90.4 km
Minnesota - Nebraska
Level 65
Jun 22, 2017
Interesting concept, but lots of errors. How do you calculate New Hampshire-Pennsylvania? The lowest I can get that to is 242 km. Arkansas and Oklahoma share a pretty long border. Rhode Island is 3.5 km from New York at Fishers Island, and not included.
Level 70
Jan 22, 2018
Yes lots of errors, probably made too hastily, will have to take some serious revision.