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Longest U.S. State Borders

Name the states that share the 10 longest borders between two U.S. states.
Quiz by iRDM
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Last updated: December 5, 2022
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First submittedApril 25, 2019
Times taken18,390
Average score76.5%
Rating4.47
2:00
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 / 17 guessed
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mi
States
km
715
Texas
1151
Oklahoma
608
California
979
Nevada
570
Montana
917
Idaho
536
Texas
863
New Mexico
457
Louisiana
735
Mississippi
mi
States
km
409
Oklahoma
658
Kansas
399
Nebraska
643
South Dakota
391
Arizona
629
New Mexico
386
Washington
621
Oregon
381
Virginia
613
West Virginia
+5
Level 76
Apr 7, 2023
congrats on your first feature, iRDM!

oh thanks iRDM, i appreciate you noticing ;_;

+8
Level 73
Dec 3, 2022
River bends ftw
+8
Level 82
Dec 3, 2022
have to say, I was very surprised by that last one. I didn't think anything east of the Mississippi would be here, but what do ya know!
+2
Level 82
Dec 4, 2022
I'd suggest reducing the time on this one. Two minutes gave me enough time to just go through all the states (ignoring tiny ones like RI and Delaware). Didn't even bother thinking about where the borders are.
+1
Level 76
Dec 5, 2022
Good call! It has been changed :D
+4
Level ∞
Dec 5, 2022
I kept it at 2 minutes. We've been getting a lot of complaints lately about too little time.
+1
Level 76
Apr 7, 2023
oh ok D:
+3
Level 66
Dec 4, 2022
How in the world does Louisiana-Mississippi beat out Kansas-Oklahoma and Arizona-New Mexico?
+5
Level 70
Dec 5, 2022
Curvy river borders are a lot longer than completely straight line borders.
+1
Level 86
Dec 5, 2022
This. I live in Louisiana and still missed it, though.
+2
Level 72
Feb 9, 2023
I was enjoying this quiz when time ran out. I ended up with 12/17. Thanks for the quiz!
+1
Level 76
Feb 13, 2023
:D
+1
Level 43
Feb 9, 2023
Surprised North and South Dakota wasn’t a match
+1
Level 76
Feb 13, 2023
haha yeah, every single other border in the North Dakota-Texas column was on the list, kinda odd! I think it's because of lines of longitude getting closer together the farther north you go, or something like that
+1
Level 76
Jan 29, 2024
The border is also completely straight, while most of the others are curvy and therefore much longer.
+1
Level 67
Feb 16, 2023
Just missed South Dakota