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

[JayhawkCO]

North Dakota:
I-29: MO, IA, SD
I-94: MT, MN, WI, IL, IN, MI
US2: WA, ID, MT, MN, WI, MI
US10: MN, WI, MI
US12: WA, ID, MT, SD, MN, WI, IL, IN, MI
US52: MN, IA, IL, IN, OH, WV, KY, VA, NC, SC
US81: TX, OK, KS, NE, SD
US83: TX, OK, KS, NE, SD
US85: TX, NM, CO, WY, SD
US281: TX, OK, KS, NE, SD

24 States.  Closest not connected: UT (424 miles)

Nebraska:
I-76: CO
I-80: CA, NV, UT, WY, IA, IL, IN, OH, PA, NJ
I-129: IA
US6: CA, NV, UT, CO, IA, IL, IN, OH, PA, NY, CT, RI, MA
US20: OR, ID, MT, WY, IA, IL, IN, OH, PA, NY, MA
US26: OR, ID, WY
US30: OR, ID, WY, IA, IL, IN, OH, WV, PA, NJ
US34: CO, IA, IL
US73: KS
US75: TX, OK, KS, IA, MN
US77: TX, OK, KS, IA
US81: TX, OK, KS, SD, ND
US83: TX, OK, KS, SD, ND
US136: MO, IA, IL, IN
US138: CO
US159: KS, MO
US183: TX, OK, KS, SD
US275: IA
US281: TX, OK, KS, SD, ND
US283: TX, OK, KS
US385: TX, OK, CO, SD

26 States.  Closest not connected: AR (244 miles)

Oklahoma:
I-35: TX, KS, MO, IA, MN
I-40: CA, AZ, NM, TX, AR, TN, NC
I-44: TX, MO
US54: TX, NM, KS, MO, IL
US56: NM, KS, MO
US59: TX, AR, KS, MO, IA, MN
US60: AZ, NM, TX, MO, IL, KY, WV, VA
US62: TX, NM, AR, MO, IL, KY, OH, PA, NY
US64: AZ, NM, AR, TN, NC
US69: TX, KS, MO, IA, MN
US70: AZ, NM, TX, AR, TN, NC
US75: TX, OK, KS, NE, IA, MN
US77: TX, KS, NE, IA
US81: TX, KS, NE, SD, ND
US83: TX, KS, NE, SD, ND
US169: KS, MO, IA, MN
US177: KS
US183: TX, KS, NE, SD
US259: TX
US270: KS, AR
US271: TX, AR
US277: TX
US281: TX, KS, NE, SD, ND
US283: TX, KS, NE
US287: TX, CO, WY, MT
US377: TX
US385: TX, CO, NE, SD
US412: NM, AR, MO, TN

24 States.  Closest not connected: LA (49 miles)

Chris

[Mapmikey]

For Virginia interstates....

I-64 - WV, KY, IN, IL, MO
I-77 - SC, NC, WV, OH
I-81 - TN, WV, MD, PA, NY
I-85 - NC, SC, GA, AL
I-95 - FL, GA, SC, NC, MD, DE, PA, NJ, NY, CT, RI, MA, NE, ME
I-495 - MD

22 states via the interstate highway system. I-395 and I-66 also connect to DC, along with I-95.

In the future, we may see I-73 connect to NC and SC, I-785 connect to NC, and I-87 connect to NC.

Finishing Virginia (new states only):
US 11 - LA, MS
US 23 - MI
US 50 - CA, NV, UT, CO, KS
US 52 - ND, MN, IA

33 in total

Dang it...

Forgot US 60 - AZ, NM, TX, OK

So 4 more for Virginia

[SEWIGuy]

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

I did!  Thank you.  Will edit

[bassoon1986]

I'll finish Louisiana.

I had 13 for other states reached by interstate.

US Routes that add new states:
11: VA, MD, WV, PA, NY
51: KY, WI
61: IA, MN
84: CO

23 total.


iPhone

[SkyPesos]

Some more states

Massachusetts:
I-95: FL, GA, SC, NC, VA, DC, MD, DE, PA, NJ, NY, CT, RI, NH, ME (15)
I-93: VT (16)
I-90: WA, ID, MT, WY, SD, MN, WI, IL, IN, OH (26)
US 6: CA, NV, UT, CO, NE, IA (32)
US 20: OR (33)

North Carolina:
I-95: FL, GA, SC, VA, DC, MD, DE, PA, NJ, NY, CT, RI, MA, NH, ME (15)
I-85: AL (16)
I-77: WV, OH (18)
I-40: CA, AZ, NM, TX, OK, AR, TN (25)
US 23: KY, MI (27)
US 52: ND, MN, IA, IL, IN (32)

Georgia:
I-95: FL, SC, NC, VA, DC, MD, DE, PA, NJ, NY, CT, RI, MA, NH, ME (15)
I-85: AL (16)
I-75: TN, KY, OH, MI (20)
I-59: LA, MS (22)
I-24: IL (23)
I-20: TX (24)
US 19: WV (25)
US 27: IN (26)
US 41: WI (27)
US 84: CO, NM (29)


Tennessee:
I-81: VA, WV, MD, PA, NY (5)
I-75: FL, GA, KY, OH, MI (10)
I-65: AL, IN (12)
I-55: LA, MS, AR, MO, IL (17)
I-40: CA, AZ, NM, TX, OK, NC (23)
US 25: SC (24)
US 41: WI (25)
US 61: IA, MN (27)


Updated the LB

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

1 - Illinois (45)
2 - Pennsylvania (44)
2 - New York (44)
4 - Ohio (41)
5 - Virginia (38)
6 - Indiana (37)
7 - Colorado (35)
8 - Massachusetts (33)
8 - Missouri (33)
10 - California (32)
10 - North Carolina (32)
12 - Florida (30)
12 - Texas (30)
14 - Georgia (29)
14 - South Carolina (29)
16 - Minnesota (27)
16 - New Mexico (27)
16 - Tennessee (27)
16 - Utah (27)
20 - DC (26)
20 - Kansas (26)
20 - Nebraska (26)
20 - Nevada (26)
20 - Wyoming (26)
25 - Connecticut (25)
26 - Arizona (24)
26 - Montana (24)
26 - Nevada (24)
26 - North Dakota (24)
26 - Oklahoma (24)
26 - Rhode Island (24)
26 - Wisconsin (24)
33 - Louisiana (23)
33 - Mississippi (23)
35 - South Dakota (22)
35 - Michigan (22)
37 - Oregon (18)
38 - Washington (17)
...
49 - Vermont (5)

[hbelkins]

Kentucky's interstates touch surprisingly few other states.

In numerical order, adding only states not previously listed.

I-24: Illinois, Tennessee, Georgia.
I-64: Missouri, Indiana, West Virginia, Virginia
I-65: Alabama
I-69: Not counted since it's a discontinuous route at the moment.
I-71: Ohio
I-75: Michigan, Florida

That's only 11 states.

[dlsterner]

I haven't seen Maryland done; nor is it on the leaderboard at this moment.

First occurrence in the list is bolded.

I-68:  WV
I-70:  PA, WV, OH, IN, IL, MO, KS, CO, UT
I-81:  NY, PA, WV, VA, TN
I-83:  PA
I-95:  ME, NH, MA, RI, CT, NY, NJ, PA, DE, DC, VA, NC, SC, GA, FL
I-295: DC
I-495: DC, VA

US 1:  ME, NH, MA, RI, CT, NY, NJ, PA, DC, VA, NC, SC, GA, FL
US 11:  NY, PA, WV, VA, TN, GA, AL, MS, LA
US 13:  PA, DE, VA, NC
US 15:  NY, PA, VA, NC, SC
US 29:  DC, VA, NC, SC, GA, AL, FL
US 40:  NJ, DE, PA, WV, OH, IN, IL, MO, KS, CO, UT
US 50:  DC, VA, WV, OH, IN, IL, MO, KS, CO, UT, NV, CA
US 113:  DE
US 219:  NY, PA, WV, VA
US 220:  PA, VA, WV, NC
US 222:  PA
US 301:  DE, VA, NC, SC, GA, FL
US 340:  WV, VA
US 522:  PA, WV, VA

Unless I've miscounted (which is a definite possibility) I get 28 states plus DC.

Methinks Maryland needs to ranked a bit higher - pretty good for such a small state if I do say so myself.

[dlsterner]

I haven't seen Maryland done; nor is it on the leaderboard at this moment.

First occurrence in the list is bolded.

I-68:  WV
I-70:  PA, WV, OH, IN, IL, MO, KS, CO, UT
I-81:  NY, PA, WV, VA, TN
I-83:  PA
I-95:  ME, NH, MA, RI, CT, NY, NJ, PA, DE, DC, VA, NC, SC, GA, FL
I-295: DC
I-495: DC, VA

US 1:  ME, NH, MA, RI, CT, NY, NJ, PA, DC, VA, NC, SC, GA, FL
US 11:  NY, PA, WV, VA, TN, GA, AL, MS, LA
US 13:  PA, DE, VA, NC
US 15:  NY, PA, VA, NC, SC
US 29:  DC, VA, NC, SC, GA, AL, FL
US 40:  NJ, DE, PA, WV, OH, IN, IL, MO, KS, CO, UT
US 50:  DC, VA, WV, OH, IN, IL, MO, KS, CO, UT, NV, CA
US 113:  DE
US 219:  NY, PA, WV, VA
US 220:  PA, VA, WV, NC
US 222:  PA
US 301:  DE, VA, NC, SC, GA, FL
US 340:  WV, VA
US 522:  PA, WV, VA

Unless I've miscounted (which is a definite possibility) I get 28 states plus DC.

Methinks Maryland needs to ranked a bit higher - pretty good for such a small state if I do say so myself.

Interesting footnote - it looks like I only need three highways to get all of the states:

I-95:  ME, NH, MA, RI, CT, NY, NJ, PA, DE, DC, VA, NC, SC, GA, FL

US 11:  NY, PA, WV, VA, TN, GA, AL, MS, LA
US 50:  DC, VA, WV, OH, IN, IL, MO, KS, CO, UT, NV, CA

[SkyPesos]

Kentucky's interstates touch surprisingly few other states.

In numerical order, adding only states not previously listed.

I-24: Illinois, Tennessee, Georgia.
I-64: Missouri, Indiana, West Virginia, Virginia
I-65: Alabama
I-69: Not counted since it's a discontinuous route at the moment.
I-71: Ohio
I-75: Michigan, Florida

That's only 11 states.

I'll add in the US routes for KY too. Lmk if I'm missing any state.
US 25: NC, SC (13)
US 51: LA, MS, WI (16)
US 52: ND, MN, IA (19)
US 60: AZ, NM, TX, OK (23)
US 62: AR, PA, NY (26)

Surprisingly, no same numbered route between Kentucky and Kansas, considering they're only one state (Missouri) apart.

[JayhawkCO]

Kentucky's interstates touch surprisingly few other states.

In numerical order, adding only states not previously listed.

I-24: Illinois, Tennessee, Georgia.
I-64: Missouri, Indiana, West Virginia, Virginia
I-65: Alabama
I-69: Not counted since it's a discontinuous route at the moment.
I-71: Ohio
I-75: Michigan, Florida

That's only 11 states.

I'll add in the US routes for KY too. Lmk if I'm missing any state.
US 25: NC, SC (13)
US 51: LA, MS, WI (16)
US 52: ND, MN, IA (19)
US 60: AZ, NM, TX, OK (23)
US 62: AR, PA, NY (26)

Surprisingly, no same numbered route between Kentucky and Kansas, considering they're only one state (Missouri) apart.

Just a heads up that there was an update to Montana upthread and its total is now 25.


Just a heads up you didn't get my Idaho count on the scoreboard.

Chris

[FrCorySticha]

Just a heads up that there was an update to Montana upthread and its total is now 25.

Chris

It's been seen and is currently correct. I made two mistakes which balanced out.

[JayhawkCO]

Iowa:
I-35: TX, OK, KS, MO, MN
I-74: IL, IN, OH
I-80: CA, NV, UT, WY, NE, IL, IN, OH, PA, NJ
I-129: NE
I-480: NE
US6: CA, NV, UT, CO, NE, IL, IN, OH, PA, NY, CT, RI, MA
US18: WY, SD, WI
US20: OR, ID, MT, NE, IL, IN, OH, PA, NY, MA
US30: OR, ID, WY, NE, IL, IN, OH, WV, PA NJ
US34: CO, NE, IL
US52: ND, MN, IL, IN, OH, KY, VA, NC, SC
US59: TX, AR, OK, KS, MO, MN
US61: LA, MS, TN, AR, MO, WI, MN
US63: LA, AR, MO, MN, WI
US65: LA, AR, MO, MN
US67: TX, AR, MO, IL
US69: TX, OK, KS, MO, MN
US71: LA, AR, TX, MO, MN
US75: TX, OK, KS, NE, MN
US77: TX, OK, KS, NE
US136: NE, MO, IL, IN
US151: WI
US169: OK, KS, MO, MN
US218: MN
US275: NE, MO

34 States.  Closest not connected: MI (152 miles)

Arkansas:
I-30: TX
I-40: CA, AZ, NM, TX, OK, TN, NC
I-49: LA, MO
I-55: LA, MS, TN, MO, IL
US49: MS
US59: TX, OK, KS, MO, IA, MN
US61: LA, MS, TN, MO, IA, WI, MN
US63: LA, MO, IA, MN, WI
US64: AZ, NM, OK, TN, NC
US65: LA, MO, IA, MN
US67: TX, MO, IL, IA
US70: AZ, NM, TX, TN, NC
US71: LA, MO, IA, MN
US79: TX, LA, TN, KY
US82: NM, TX, MS, AL, GA
US165: LA
US167: LA
US270: KS, OK
US271: TX, OK
US278: MS, AL, GA, SC
US371: LA
US412; NM, OK, MO, TN
US425: MS, LA

20 States.  Closest not connected: IN (154 miles)

Maine:
I-95: FL, GA, SC, NC, VA, DC, MD, DE, PA, NJ, NY, CT, RI, MA, NH
US1: FL, GA, SC, NC, VA, DC, MD, DE, PA, NJ, NY, CT, RI, MA, NH
US2 (Eastern): NY, VT, NH
US202: DE, PA, NJ, NY, CT, MA, NH
US303: VT, NM

15 States + DC.  Closest not connected: WV (438 Miles)

New Hampshire:
I-93: MA
I-95: FL, GA, SC, NC, VA, DC, MD, DE, PA, NJ, NY, CT, RI, MA, ME
US1: FL, GA, SC, NC, VA, DC, MD, DE, PA, NJ, NY, CT, RI, MA, ME
US2: NY, VT, ME
US3: MA
US4: NY, VT
US202: DE, PA, NJ, NY, CT, MA
US302: VT, ME

15 States + DC.  Closest not connected: WV (353 miles)

West Virginia:
I-64: MO, IL, IN, KY, VA
I-68: MD
I-70: UT, CO, KS, MO, IL, IN, OH, PA, MD
I-77: SC, NC, VA, OH
I-79: PA
I-81: TN, VA, MD, PA, NY
I-470: OH
US11: LA, MS, AL, GA, TN, VA, MD, PA, NY
US19: FL, GA, NC, TN, VA, PA
US22: OH, PA, NJ
US30: OR, ID, WY, NE, IA, IL, IN, OH, PA, NJ
US33: IN, OH, VA
US35: IN, OH
US40: UT, CO, KS, MO, IL, IN, OH, PA, MD, DE, NJ
US48: VA
US50: CA, NV, UT, CO, KS, MO, IL, IN, OH, VA, DC, MD
US52: ND, MN, IA, IL, IN, OH, KY, VA, NC, SC
US60: AZ, NM, TX, OK, MO, IL, KY, VA
US119: KY, PA
US219: VA, MD, PA, NY
US220: NC, VA, MD, PA
US250: OH, VA
US340: VA, MD
US460: KY, VA
US522: VA, PA

34 States + DC.  Closest not connected: MI (164 Miles)

Looks like we're missing Alabama, Delaware, Kentucky, and New Jersey.

Chris

[Crown Victoria]

Delaware:

I-95: FL, GA, SC, NC, VA, DC, MD, PA, NJ, NY, CT, RI, MA, NH, ME (15)
US 40: UT, CO, KS, MO, IL, IN, OH, WV (8)

The rest of Delaware's Interstate and US Routes do not add any new states to the list. US 40 formerly added NV and CA. US 50 misses Delaware by less than a mile and would add CA, NV, and KY. Closest not connected is VT.

Total: 22+DC

[kenarmy]

Alabama:

AK:
AR: US 278, US 82,
AZ: I-10
CA: I-10
CO: US 84 (surprising)
CT:
DE:
FL: I-10, US 90, US 98, US 29, US 331, US 231
GA: *inhale* US 80, US 11, US 78, US 278, US 84, US 82, US 280, US 411, US 29, I-85, I-20, I-59.
HI:
ID:
IL: US 45
IN: US 31, I-65, US 231
IA:
KS:
KY: US 31, I-65, US 231, US 431, US 45
LA: I-10, US 90, US 84, US 80, I-20
MA:
ME:
MD: US 11, US 29
WASHINGTON D.C.: US 29
MI: US 45, US 31
MO:
MS: US 80, US 90, US 98, I-10 etc...
MN:
MT:
NE:
NV:
NC: I-85, US 29
ND:
OH:
OK:
OR:
PA: US 11
RI:
SC: I-85, I-20, US 29, US 78, US 278
SD:
TN: US 72, US 78, US 11, I-65, US 31, etc..
TX: I-10, US 90, US 82, US 84, US 80, I-20
UT:
VT:
VA: I-85, US 11, US 29,
WA:
WV: US 11
WI: US 45
WY:
I got 22 including D.C.

[hotdogPi]

Alabama:

AK:
AR: US 278, US 82,
AZ: I-10
CA: I-10
CO: US 84 (surprising)
CT:
DE:
FL: I-10, US 90, US 98, US 29, US 331, US 231
GA: *inhale* US 80, US 11, US 78, US 278, US 84, US 82, US 280, US 411, US 29, I-85, I-20, I-59.
HI:
ID:
IL: US 45
IN: US 31, I-65, US 231
IA:
KS:
KY: US 31, I-65, US 231, US 431, US 45
LA: I-10, US 90, US 84, US 80, I-20
MA:
ME:
MD: US 11, US 29
WASHINGTON D.C.: US 29
MI: US 45, US 31
MO:
MS: US 80, US 90, US 98, I-10 etc...
MN:
MT:
NE:
NV:
NC: I-85, US 29
ND:
OH:
OK:
OR:
PA: US 11
RI:
SC: I-85, I-20, US 29, US 78, US 278
SD:
TN: US 72, US 78, US 11, I-65, US 31, etc..
TX: I-10, US 90, US 82, US 84, US 80, I-20
UT:
VT:
VA: I-85, US 11, US 29,
WA:
WV: US 11
WI: US 45
WY:
I got 22 including D.C.

You skipped 4 of the N states. NY (US 11), NH (none), NJ (none), NM (I-10)

[Crown Victoria]

New Jersey:

I-76: PA, OH (2)
I-78: NY (1)
I-80: CA, NV, UT, WY, NE, IA, IL, IN (8)
I-95: FL, GA, SC, NC, VA, DC, MD, DE, CT, RI, MA, NH, ME (12+DC)

US 30: OR, ID, WV (3)
US 40: CO, KS, MO (3)

New Jersey's other Interstates and US Routes do not add any other states to this list. I-80 misses MI by less than one mile. Closest not connected is VT.

Total: 29+DC

[Ketchup99]

Pennsylvania:
I-90 - MA, NY, OH, IN, IL, WI, MN, SD, MT, ID, WA
I-80 - NJ, IA, NE, WY, UT, NV, CA
I-70 - MD, MO, KS, CO
I-79 - WV
I-81 - TN, VA, WV
I-95 - ME, NH, RI, CT, DE, NC, SC, GA, FL
US 62 - KY, AR, OK, TX, NM
US 11 - LA, MS, AL
So, 44. All but Michigan, Vermont, and Arizona in the lower 48.

[kenarmy]

I made the Alabama list late last night and fell asleep lmao

AK:
AR: US 278, US 82,
AZ: I-10
CA: I-10
CO: US 84 (surprising)
CT:
DE:
FL: I-10, US 90, US 98, US 29, US 331, US 231
GA: *inhale* US 80, US 11, US 78, US 278, US 84, US 82, US 280, US 411, US 29, I-85, I-20, I-59.
HI:
ID:
IL: US 45
IN: US 31, I-65, US 231
IA:
KS:
KY: US 31, I-65, US 231, US 431, US 45
LA: I-10, US 90, US 84, US 80, I-20
MA:
ME:
MD: US 11, US 29
WASHINGTON D.C.: US 29
MI: US 45, US 31
MO:
MS: US 80, US 90, US 98, I-10 etc...
MN:
MT:
NE:
NV:
NC: I-85, US 29
ND:
NJ:
NH:
NY: US 11
NM: I-10, US 84, US 82
OH:
OK:
OR:
PA: US 11
RI:
SC: I-85, I-20, US 29, US 78, US 278
SD:
TN: US 72, US 78, US 11, I-65, US 31, etc..
TX: I-10, US 90, US 82, US 84, US 80, I-20
UT:
VT:
VA: I-85, US 11, US 29,
WA:
WV: US 11
WI: US 45
WY:
so 24 including D.C.

[JayhawkCO]

Then let's get it finished off.

Kentucky:
I-24: IL, TN, GA
I-64: MO, IL, IN, WV, VA
I-65: AL, TN, IN
I-69: TN, IN, MI
I-71: OH
I-75: FL, GA, TN, OH, MI
I-265: IN
I-275: IN, OH
I-471: OH
US23: FL, GA, NC, VA, OH, MI
US25: GA, SC, NC, TN
US27: FL, GA, TN, OH, IN
US31: AL, TN, IN, MI
US41: FL, GA, TN, IN, IL, WI, MI
US42: OH
US45: AL, MS, TN, IL, WI, MI
US51: LA, MS, TN, IL, WI
US52: ND, MN, IA, IL, IN, OH, WV, VA, NC, SC
US60: AZ, NM, TX, OK, MO, IL, WV, VA
US62: TX, NM, OK, AR, MO, IL, OH, PA, NY
US68: OH
US79: TX, LA, AR, TN
US119: WV
US127: TN, OH, MI
US150: IL, IN
US231: FL, AL, TN, IN
US421: NC, TN, VA, IN
US431: AL, TN
US460: WV, VA
US641: TN

27 States.  Closest not connected: MD (177 miles)

Chris

[Crown Victoria]

Pennsylvania:
I-90 - MA, NY, OH, IN, IL, WI, MN, SD, MT, ID, WA
I-80 - NJ, IA, NE, WY, UT, NV, CA
I-70 - MD, MO, KS, CO
I-79 - WV
I-81 - TN, VA, WV
I-95 - ME, NH, RI, CT, DE, NC, SC, GA, FL
US 62 - KY, AR, OK, TX, NM
US 11 - LA, MS, AL
So, 44. All but Michigan, Vermont, and Arizona in the lower 48.

Pennsylvania was done 2 days ago...

Pennsylvania's list, duplicates not included:

I-70: UT, CO, KS, MO, IL, IN, OH, WV, MD (9)
I-76: NJ (1)
I-78: NY (1)
I-79: No new states added
I-80: CA, NV, WY, NE, IA (5)
I-81: TN, VA (2)
I-83: No new states added
I-84: CT, MA (2)
I-86: No new states added
I-90: WA, ID, MT, SD, MN, WI (6)
I-95: FL, GA, SC, NC, DC, DE, RI, NH, ME (8 plus DC)
I-99: No new states added
US 1: No new states added
US 6: No new states added
US 11: LA, MS, AL (3)
US 13: No new states added
US 15: No new states added
US 19: No new states added
US 20: OR (1)
US 22: No new states added
US 30: No new states added
US 40: No new states added
US 62: TX, NM, OK, AR, KY (5)

None of PA's 3-digit Interstate or US Routes add to this list.

There are no direct routes from PA to AZ, MI, ND, or VT. I-80 and I-90 just miss adding MI to the list by less than one mile, as does US 11 with VT! Closest state not connected is VT.

Total: 43+DC

[GaryV]

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

US-23 does not enter WV - it stays on the KY side of the border.  Back to 21 for MI.

[epzik8]

I-68: WV
I-70: UT, CO, KS, MO, IL, IN, OH, WV, PA
I-81: TN, VA, WV, PA, NY
I-83: PA
I-95: FL, GA, SC, NC, VA, DC, DE, PA, NJ, NY, CT, RI, MA, NH, ME
I-295: DC
I-495: VA, DC

US 1: FL, GA, SC, NC, VA, DC, PA, NJ, NY, CT, RI, MA, NH, ME
US 11: LA, MS, AL, GA, TN, VA, WV, PA, NY
US 13: NC, VA, DE, PA
US 15: SC, NC, VA, PA, NY
US 29: FL, AL, GA, SC, NC, VA, DC
US 40: UT, CO, KS, MO, IL, IN, OH, WV, PA
US 50: CA, NV, UT, CO, KS, MO, IL, IN, OH, WV, VA, DC
US 113: DE
US 219: VA, WV, PA, NY
US 220: NC, VA, WV, PA
US 222: PA
US 340: VA, WV
US 522: VA, WV, PA

[SkyPesos]

Arkansas:
I-30: TX
I-40: CA, AZ, NM, TX, OK, TN, NC
I-49: LA, MO
I-55: LA, MS, TN, MO, IL
US49: MS
US59: TX, OK, KS, MO, IA, MN
US61: LA, MS, TN, MO, IA, WI, MN
US63: LA, MO, IA, MN, WI
US64: AZ, NM, OK, TN, NC
US65: LA, MO, IA, MN
US67: TX, MO, IL, IA
US70: AZ, NM, TX, TN, NC
US71: LA, MO, IA, MN
US79: TX, LA, TN, KY
US82: NM, TX, MS, AL, GA
US165: LA
US167: LA
US270: KS, OK
US271: TX, OK
US278: MS, AL, GA, SC
US371: LA
US412; NM, OK, MO, TN
US425: MS, LA

20 States.  Closest not connected: IN (154 miles)

You forgot US 62, which adds in OH, PA and NY. Total is 23 now, unless there's another route that I'm forgetting too

[SkyPesos]

FINAL LEADERBOARD

1 - Illinois (45)
2 - New York, Pennsylvania (44)
4 - Ohio (41)
5 - Virginia (38)
6 - Indiana (37)
7 - Colorado (35)
8 - Iowa, West Virginia (34)
10 - Massachusetts, Missouri (33)
13 - California, North Carolina (32)
14 - Florida, New Jersey, Texas (30)
17 - Georgia, Maryland, South Carolina (29)
20 - Minnesota, New Mexico, Tennessee, Utah (27)
24 - DC, Kansas, Kentucky, Nebraska, Nevada, Wyoming (26)
30 - Connecticut (25)
31 - Alabama, Arizona, Montana, Nevada, North Dakota, Oklahoma, Rhode Island, Wisconsin (24)
39 - Arkansas, Delaware, Louisiana, Mississippi (23)
43 - South Dakota (22)
44 - Michigan (21)
45 - Oregon (18)
46 - Washington (17)
47 - Maine, New Hampshire (16)
49 - Vermont (5)
50 - Alaska, Hawaii (0)

[JayhawkCO]

You forgot US 62, which adds in OH, PA and NY. Total is 23 now, unless there's another route that I'm forgetting too

Thanks.  Not sure how I missed it since I was just using the U.S. Highways in Arkansas wiki page.

FINAL LEADERBOARD

1 - Illinois (45)
2 - New York, Pennsylvania (44)
4 - Ohio (41)
5 - Virginia (38)
6 - Indiana (37)
7 - Colorado (35)
8 - Iowa, West Virginia (34)
10 - Massachusetts, Missouri (33)
13 - California, North Carolina (32)
14 - Florida, New Jersey, Texas (30)
17 - Georgia, Maryland, South Carolina (29)
20 - Minnesota, New Mexico, Tennessee, Utah (27)
24 - DC, Kansas, Kentucky, Nebraska, Nevada, Wyoming (26)
30 - Connecticut (25)
31 - Alabama, Arizona, Montana, Nevada, North Dakota, Oklahoma, Rhode Island, Wisconsin (24)
39 - Arkansas, Delaware, Louisiana, Mississippi (23)
43 - South Dakota (22)
44 - Michigan (21)
45 - Oregon (18)
46 - Washington (17)
47 - Maine, New Hampshire (16)
49 - Vermont (5)
50 - Alaska, Hawaii (0)

Interesting that my home state is the winner for west of the Mississippi.  I would have thought Missouri or Texas would have been highest for sure.

Chris