How many states are directly connected to yours via an interstate or US highway?

[JoePCool14]

I'll keep track with a leaderboard here. Counts will include DC.

1 - Illinois (45)

This is very impressive, but also not surprising, considering the number of key routes that have to bend down here to get around the Great Lakes.

[hotdogPi]

The reason I chose Illinois for the county thread was because I knew it had the state record (although it might have tied; I can't remember).

The thing about Illinois is that of the top three cities in the US outside Illinois (New York City, Los Angeles, and Houston), Illinois routes hit none of them.

[JayhawkCO]

New Mexico:
I-10: CA, AZ, TX, LA, MS, AL, FL
I-25: CO, WY
I-40: CA, AZ, TX, OK, AR, TN, NC
US54: TX, OK, KS, MO, IL
US56: OK, KS, MO
US60: AZ, TX, OK, MO, IL, KY, WV, VA
US62: TX, OK, AR, MO, IL, KY, OH, PA, NY
US64: AZ, OK, AR, TN, NC
US70: AZ, TX, OK, AR, TN, NC
US82: TX, AR, MS, AL, GA
US84: CO, TX, LA, MS, AL, GA
US85: TX, CO, WY, SD, ND
US87: TX, CO, WY, MT
US160: AZ, CO, KS, MO
US180: AZ, TX
US285: TX, CO
US380: TX
US491: UT
US550: CO

27 States. Closest not connected: NV (277 miles)

Chris

[SkyPesos]

The thing about Illinois is that of the top three cities in the US outside Illinois (New York City, Los Angeles, and Houston), Illinois routes hit none of them.

It used to serve one of them with two routes in the past (LA with US 6 and US 66), but not anymore

If we're counting the top 3 metro areas outside Illinois (NYC, LA, Dallas), Illinois gets 2 of the 3 (3/3 with US 66), with I-80 to NYC, US 67 to Dallas.

[Crown Victoria]

The reason I chose Illinois for the county thread was because I knew it had the state record (although it might have tied; I can't remember).

The thing about Illinois is that of the top three cities in the US outside Illinois (New York City, Los Angeles, and Houston), Illinois routes hit none of them.

One only needs to bring back US 66 and extend I-80 a few miles and you've got the two biggest taken care of.

[SEWIGuy]

Wisconsin has 26 if you count eastern US-2.  Only 23 if you do not:

I-39: IL
I-41: IL
I-43: NA
I-90: MA, NY, PA, OH, IN, IL, MN, SD, WY, MT, ID, WA
I-94: MI, IN, IL, MN, ND, MT
I-535: MN
I-794: NA
I-894: NA
US-2:  ME, NH, VT, NY, MI, MN, ND, MT, ID, WA
US-8: MN
US-10: MI, MN
US-12: MI, IN, IL, MN, SD, MT, ID, WA
US-14: IL, MN, SD, WY
US-18: IA, SD, WY
US-41: MI, IL, IN, KY, TN, GA, FL
US-45: MI, IL, KY, TN, MS
US-51: IL, KY, TN, MS, LA, AL
US-53: MN
US-61: MN, IA, MO, AR, TN, MS, LA
US-63: MN, IA, MO, AR, LA
US-141: MI
US-151: IA

(Edited to correct US-45)

[kenarmy]

Wisconsin has 25 if you count eastern US-2.  Only 22 if you do not:

I-39: IL
I-41: IL
I-43: NA
I-90: MA, NY, PA, OH, IN, IL, MN, SD, WY, MT, ID, WA
I-94: MI, IN, IL, MN, ND, MT
I-535: MN
I-794: NA
I-894: NA
US-2:  ME, NH, VT, NY, MI, MN, ND, MT, ID, WA
US-8: MN
US-10: MI, MN
US-12: MI, IN, IL, MN, SD, MT, ID, WA
US-14: IL, MN, SD, WY
US-18: IA, SD, WY
US-41: MI, IL, IN, KY, TN, GA, FL
US-45: MI, IL, KY, TN, MS
US-51: IL, KY, TN, MS, LA
US-53: MN
US-61: MN, IA, MO, AR, TN, MS, LA
US-63: MN, IA, MO, AR, LA
US-141: MI
US-151: IA

You forgot US 45 goes into AL

[SkyPesos]

Michigan:
I-94: MT, ND, MN, WI, IL, IN (6)
I-75: FL, GA, TN, KY, OH (11)
US 12: WA, ID, SD (14)
US 23: NC, VA, WV (17)
US 24: CO, KS, MO (20)
US 31: AL (21)

Think Vermont may be the winner for the least amount of states. The other upper New England states have I-95, with is at least 15 states including DC already.

Vermont:
I-91: CT, MA (2)
I-89: NH (3)
US 2: NY, ME (5)

[JayhawkCO]

Nevada:
I-15: CA, AZ, UT, ID, MT
I-80: CA, UT, WY, NE, IA, IL, IN, OH, PA, NJ
US6: CA, UT, CO, NE, IA, IL, IN, OH, PA, NY, CT, RI, MA
US50: CA, UT, CO, KS, MO, IL, IN, OH, WV, VA, DC, MD
US93: AZ, ID, MT
US95: AZ, CA, OR, ID
US395: CA, OR, WA

25 States + DC.  Closest not connected: NM (277 miles)

Idaho:
I-15: CA, NV, AZ, UT, MT
I-84: OR, UT
I-90: WA, MT, WY, SD, MN, WI, IL, IN, OH, PA, NY, MA
US2 (Western): WA, MT, ND, MN, WI, MI
US12: WA, MT, ND, SD, MN, WI, IL, IN, MI
US20: OR, MT, WY, NE, IA, IL, IN, OH, PA, NY, MA
US26: OR, WY, NE
US30: OR, WY, NE, IA, IL, IN, OH, WV, PA, NJ
US89: AZ, UT, WY, MT
US91: CA, NV, AZ, UT, MT
US93: AZ, NV, ID, MT
US95: AZ, CA, NV, OR
US195: WA

24 States.  Closest not connected: CO (124 miles)

Chris

[SD Mapman]

SoDak:
I-90: WA, ID, MT, WY, MN, WI, IL, IN, OH, PA, NY, MA
I-29: ND, IA, MO
US 12: WA, ID, MT, ND, MN, WI, IL, IN, MI
US 14: WY, MN, WI, IL
US 16: WY
US 18: WY, IA, WI
US 81: ND, NE, KS, OK, TX
US 83: ND, NE, KS, OK, TX
US 85: ND, WY, CO, NM, TX
US 183: NE, KS, OK, TX
US 212: MT, WY, MN
US 281: ND, NE, KS, OK, TX
US 385: NE, CO, OK, TX

I got 22.

[kphoger]

I'd be interested to see the total for DC itself.

[SkyPesos]

I'd be interested to see the total for DC itself.

I-95: FL, GA, SC, NC, VA, MD, DE, PA, NJ, NY, CT, RI, MA, NH, ME (15)
US 50: CA, NV, UT, CO, KS, MO, IL, IN, OH, WV (25)
US 29: AL (26)

If you're nitpicky that I-95's couple hundred feet in DC doesn't count, US 1 goes through all of I-95's states except Delaware, so that total will be 25.

Also, leaderboard update

I'll keep track with a leaderboard here. Counts will include DC.

1 - Illinois (45)
2 - Pennsylvania (44)
3 - Ohio (41)
4 - Indiana (37)
5 - Colorado (35)
6 - Virginia (34)
7 - Missouri (33)
8 - California (32)
9 - Florida (30)
9 - Texas (30)
11 - South Carolina (29)
12 - Minnesota (27)
12 - New Mexico (27)
12 - Utah (27)
15 - DC (26)
15 - Kansas (26)
15 - Nevada (26)
15 - Wyoming (26)
19 - Connecticut (25)
20 - Montana (24)
20 - Nevada (24)
20 - Rhode Island (24)
23 - Mississippi (23)
23 - Wisconsin (23)
25 - South Dakota (22)
26 - Michigan (21)
...
49 - Vermont (5)

[JayhawkCO]

I'd be interested to see the total for DC itself.

Looks like I got beat to it, but...

I-66: VA
I-95: FL, GA, SC, NC, VA, MD, DE, PA, NJ, NY, CT, RI, MA, NH, ME
I-295: MD
I-395: VA
US1: FL, GA, SC, NC, VA, MD, PA, NJ, NY
US29: FL, AL, GA, SC, NC, VA, MD
US50: CA, NV, UT, CO, KS, MO, IL, IN, OH, WV, VA, MD

26 States.  Closest not connected: KY (281 miles)

Chris

[kphoger]

I'd be interested to see the total for DC itself.

I-95: FL, GA, SC, NC, VA, MD, DE, PA, NJ, NY, CT, RI, MA, NH, ME (15)
US 50: CA, NV, UT, CO, KS, MO, IL, IN, OH, WV, VA, MD (25)
US 29: AL, GA, SC, NC, VA, MD (26)

Pretty cool that, from a district with less than 70 mi², there are highways to Maine, Florida, and California.

[roadman65]

Florida:
I-4 n/a
I-10 AL, MS, LA,TX,NM,AZ,& CA
I-75 GA,TN,KY,OH, & MI
I-95 GA,SC,NC,VA,DC,MD,DE,PA,NJ,NY,CT,RI,MA,NH, & ME

US 1 GA,SC,NC,VA,DC,MD,PA,NJ,NY,CY,RI, MA, NH, & ME
US 17 GA,SC, NC, & VA
US 19, GA, NC, TN, VA, WV, & PA
US 29 Al,GA, NC, VA, DC, & MD
US 41 GA, TN, KY, IN, IL, WI, & MI
US 90 AL, MS, LA, & TX


28 for Florida

[JayhawkCO]

Slow day at work. Figured I could do the rest of the West.

Arizona:
I-8: CA
I-10: CA, NM, TX, LA, MS, AL, FL
I-15: CA, NV, UT, ID, MT
I-40: CA, NM, TX, OK, AR, TN, NC
US60: NM, TX, OK, MO, IL, KY, WV, VA
US64: NM, OK, AR, TN, NC
US70: NM, TX, OK, AR, TN, NC
US89: UT, ID, WY, MT
US93: NV, ID, MT
US95: CA, NV, OR, ID
US160: NM, CO, KS, MO
US163: UT
US180: NM, TX
US191: UT, WY, MT

24 States.  Closest not connected: NE (385 miles)

Oregon:
I-5: CA, WA
I-82: WA
I-84: ID, UT
I-205: WA
US20: ID, MT, WY, NE, IA, IL, IN, OH, PA, NY, MA
US26: ID, WY, NE
US30: ID, WY, NE, IA, IL, IN, OH, WV, PA, NJ
US95: AZ, CA, NV, ID
US97: CA, WA
US101: CA, WA
US197: WA
US199: CA
US395: CA, NV, WA
US730: WA

18 States.  Closest not connected: CO (419 miles)

Washington:
I-5: CA, OR
I-82: OR
I-90: ID, MT, WY, SD, MN, WI, IL, IN, OH, PA, NY, MA
I-205: OR
US2 (Western): ID, MT, ND, MN, WI, MI
US12: ID, MT, ND, SD, MN, WI, IL, IN, MI
US97: CA, OR
US101: CA, OR
US195: ID
US197: OR
US395: CA, NV, OR
US730: OR

17 States.  Closest not connected: UT (311 miles)

Chris

[dvferyance]

Wisconsin has 25 if you count eastern US-2.  Only 22 if you do not:

I-39: IL
I-41: IL
I-43: NA
I-90: MA, NY, PA, OH, IN, IL, MN, SD, WY, MT, ID, WA
I-94: MI, IN, IL, MN, ND, MT
I-535: MN
I-794: NA
I-894: NA
US-2:  ME, NH, VT, NY, MI, MN, ND, MT, ID, WA
US-8: MN
US-10: MI, MN
US-12: MI, IN, IL, MN, SD, MT, ID, WA
US-14: IL, MN, SD, WY
US-18: IA, SD, WY
US-41: MI, IL, IN, KY, TN, GA, FL
US-45: MI, IL, KY, TN, MS
US-51: IL, KY, TN, MS, LA
US-53: MN
US-61: MN, IA, MO, AR, TN, MS, LA
US-63: MN, IA, MO, AR, LA
US-141: MI
US-151: IA

I don't count IL for I-41. And the eastern US 2 is separate route. So it's really 21.

[SkyPesos]

Idaho:
I-15: CA, NV, AZ, UT, MT
I-84: OR, UT
I-90: WA, MT, WY, SD, MN, WI, IL, IN, OH, PA, NY, MA
US2 (Western): WA, MT, ND, MN, WI, MI
US12: WA, MT, ND, SD, MN, WI, IL, IN, MI
US20: OR, MT, WY, NE, IA, IL, IN, OH, PA, NY, MA
US26: OR, WY, NE
US30: OR, WY, NE, IA, IL, IN, OH, WV, PA, NJ
US89: AZ, UT, WY, MT
US91: CA, NV, AZ, UT, MT
US93: AZ, NV, ID, MT
US95: AZ, CA, NV, OR
US195: WA

24 States.  Closest not connected: NM (361 miles)

Closest is Colorado actually. I was surprised that there's no routes from Colorado to the Pacific NW states with how close they are geographically. From the NW corner of Colorado to SE corner of Idaho, it's a straight line distance of 125 miles.

[JayhawkCO]

Idaho:
I-15: CA, NV, AZ, UT, MT
I-84: OR, UT
I-90: WA, MT, WY, SD, MN, WI, IL, IN, OH, PA, NY, MA
US2 (Western): WA, MT, ND, MN, WI, MI
US12: WA, MT, ND, SD, MN, WI, IL, IN, MI
US20: OR, MT, WY, NE, IA, IL, IN, OH, PA, NY, MA
US26: OR, WY, NE
US30: OR, WY, NE, IA, IL, IN, OH, WV, PA, NJ
US89: AZ, UT, WY, MT
US91: CA, NV, AZ, UT, MT
US93: AZ, NV, ID, MT
US95: AZ, CA, NV, OR
US195: WA

24 States.  Closest not connected: NM (361 miles)

Closest is Colorado actually. I was surprised that there's no routes from Colorado to the Pacific NW states with how close they are geographically. From the NW corner of Colorado to SE corner of Idaho, it's a straight line distance of 125 miles.

Don't know how I missed that.  I'll edit.

Chris

[JayhawkCO]

Wisconsin has 25 if you count eastern US-2.  Only 22 if you do not:

I-39: IL
I-41: IL
I-43: NA
I-90: MA, NY, PA, OH, IN, IL, MN, SD, WY, MT, ID, WA
I-94: MI, IN, IL, MN, ND, MT
I-535: MN
I-794: NA
I-894: NA
US-2:  ME, NH, VT, NY, MI, MN, ND, MT, ID, WA
US-8: MN
US-10: MI, MN
US-12: MI, IN, IL, MN, SD, MT, ID, WA
US-14: IL, MN, SD, WY
US-18: IA, SD, WY
US-41: MI, IL, IN, KY, TN, GA, FL
US-45: MI, IL, KY, TN, MS
US-51: IL, KY, TN, MS, LA
US-53: MN
US-61: MN, IA, MO, AR, TN, MS, LA
US-63: MN, IA, MO, AR, LA
US-141: MI
US-151: IA

I don't count IL for I-41. And the eastern US 2 is separate route. So it's really 21.

I've counted this three times now and keep getting 23.  (The I-41/IL thing doesn't matter since many other routes connect the two.)

Chris

[hotdogPi]

Wisconsin has 25 if you count eastern US-2.  Only 22 if you do not:

I-39: IL
I-41: IL
I-43: NA
I-90: MA, NY, PA, OH, IN, IL, MN, SD, WY, MT, ID, WA
I-94: MI, IN, IL, MN, ND, MT
I-535: MN
I-794: NA
I-894: NA
US-2:  ME, NH, VT, NY, MI, MN, ND, MT, ID, WA
US-8: MN
US-10: MI, MN
US-12: MI, IN, IL, MN, SD, MT, ID, WA
US-14: IL, MN, SD, WY
US-18: IA, SD, WY
US-41: MI, IL, IN, KY, TN, GA, FL
US-45: MI, IL, KY, TN, MS
US-51: IL, KY, TN, MS, LA
US-53: MN
US-61: MN, IA, MO, AR, TN, MS, LA
US-63: MN, IA, MO, AR, LA
US-141: MI
US-151: IA

I don't count IL for I-41. And the eastern US 2 is separate route. So it's really 21.

I've counted this three times now and keep getting 23.  (The I-41/IL thing doesn't matter since many other routes connect the two.)

Chris

I'm also getting 23, excluding eastern US 2 and whichever state NA is.

[vdeane]

Not sure how to count things like US route E/W splits or routes that have a discontinuous portion through Yellowstone, but here's the behemoth that is NY, presuming I didn't miss anything and counted right.

New York:
-I-78: PA, NJ
-I-81: TN, VA, WV, MD, PA
-I-84: PA, CT, MA
-I-86: PA
-I-90: WA, ID, MT, WY, SD, MN, WI, IL, IN, OH, PA, MA
-I-95: FL, GA, SC, NC, VA, DC*, MD, DE, PA, NJ, CT, RI, MA, NH, ME
-I-99: PA**
-I-278: NJ
-I-287: NJ
-I-684: CT*
-US 1: FL, GA, SC, NC, VA, DC, MD, PA, NJ, CT, RI, MA, NH, ME
-US 2: VT, NH, ME
-US 4: VT, NH
-US 6: CA, NV, UT, CO, NE, IA, IL, IN, OH, PA, CT, RI, MA
-US 9: DE, NJ
-US 9W: NJ
-US 11: (LA, MS, AL, GA, TN), VA, WV, MD, PA
-US 15: SC, NC, VA, MD, PA
-US 20: (OR, ID, MT), WY, NE, IA, IL, IN, OH, PA, MA
-US 44: CT, RI, MA
-US 62: TX, NM, OK, AR, MO, IL, KY, OH, PA
-US 202: DE, PA, NJ, CT, MA, NH, ME
-US 209: PA
-US 219: VA, WV, MD, PA

Total:
-44 if including all
-43 if including US 11 south of the split in TN/VA but not US 20 west of Yellowstone
-41 if including US 20 west of Yellowstone but not US 11 south of the split in TN/VA
-40 if including neither US 11 south of the split in TN/VA nor US 20 West of Yellowstone

*Passes though, no exit
**Ends at border, extension planned

[SkyPesos]

Updated leaderboard with NY, counting both routes pass their split.

I'll keep track with a leaderboard here. Counts will include DC.

1 - Illinois (45)
2 - New York (44)
2 - Pennsylvania (44)
4 - Ohio (41)
5 - Indiana (37)
6 - Colorado (35)
7 - Virginia (34)
8 - Missouri (33)
9 - California (32)
10 - Florida (30)
10 - Texas (30)
12 - South Carolina (29)
13 - Minnesota (27)
13 - New Mexico (27)
13 - Utah (27)
16 - DC (26)
16 - Kansas (26)
16 - Nevada (26)
16 - Wyoming (26)
20 - Connecticut (25)
21 - Arizona (24)
21 - Montana (24)
21 - Nevada (24)
21 - Rhode Island (24)
25 - Mississippi (23)
25 - Wisconsin (23)
27 - South Dakota (22)
28 - Michigan (21)
29 - Oregon (18)
30 - Washington (17)
...
49 - Vermont (5)

[wanderer2575]

Michigan:
I-94: MT, ND, MN, WI, IL, IN (6)
I-75: FL, GA, TN, KY, OH (11)
US 12: WA, ID, SD (14)
US 23: NC, VA, WV (17)
US 24: CO, KS, MO (20)
US 31: AL (21)

US-45:  MS

[JayhawkCO]

I'm also getting 23, excluding eastern US 2 and whichever state NA is.

NA is N/A since it's in intrastate route.

Chris