US States with Longest and Shortest Shared Borders

Which pairs of US states share the longest, and the shortest, joint borders? The state names, or the first three letters, or their regular 2-letter abbeviations all work. (For example, if you think "Texas & Maine" is an answer, that can be written TexasMaine, MaineTexas, TexMai, MaiTex, TXME or METX.
If you include DC, its borders with VA and MD would rank 4th and 6th on the short list
Quiz by TenThousand
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Last updated: February 3, 2015
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First submittedFebruary 3, 2015
Times taken2,422
Average score35.0%
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miles
states
km
715
Oklahoma - Texas
1152
608
California - Nevada
979
569
Idaho - Montana
917
536
New Mexico - Texas
863
456
Louisiana - Mississippi
735
409
Kansas - Oklahoma
659
399
Nebraska - South Dakota
643
391
Arizona - New Mexico
630
385
Oregon - Washington
621
381
Virginia - West Virginia
614
miles
states
km
0
New Mexico - Utah
0
0
Arizona - Colorado
0
1
Delaware - New Jersey
2
22
Delaware - Pennsylvania
36
34
Missouri - Oklahoma
55
34
New Mexico - Oklahoma
56
40
Connecticut - Rhode Island
66
40
Massachusetts - Vermont
66
49
Massachusetts - New York
80
52
Colorado - Oklahoma
85
+2
Level 76
Feb 3, 2015
Nearest misses: Montana/Wyoming and Missouri/Nebraska.
+2
Level 76
Feb 3, 2015
Distance isn't shown for MT-WY

For people like me who don't know the abbreviations well enough it'd be nice if you could show the full names in the answers (and perhaps allow for typing things like OklTex but I suppose it'd be tricky considering that many states start with NEW, NOR or SOU...)

Nice quiz, good idea!

+2
Level 76
Feb 3, 2015
Thanks for your feedback - we've made the changes you suggested.
+1
Level 76
Feb 3, 2015
Thanks!
+1
Level 76
Nov 23, 2022
ooh, very cool! Never thought about how the cornered panhandles would add so much distance to the OK-TX border. Pythagoras be damned!