How many interstates in the state you live in?

[STLmapboy]

In Missouri, there are 18 interstate highways. This puts us 7th in the nation (behind NC, TX, IL, NY, OH, and PA). Not too shabby.

2di (9):
29
35
44
49
55
57
64
70
72

3di (9):
155
170
229
255
270
435
470
635
670

I've been on 11 of the 18 in my state.

[bassoon1986]

13 in Louisiana. 6 are 2dis and 7 are 3dis


iPhone

[SkyPesos]

I'll take this as an opportunity to try to name all the interstates in my state off my head. I've been on the ones bolded

2di:
70, 71, 74, 75, 76, 77 (concurrency with 76), 80, 90 (8)

3di:
270, 470, 670
271, 471
275, 475, 675
277
280 (for the sole reason to drive on a bridge), 480 (concurrency with 271), 680
490 (13)

Total: 21, been on 18

Edit: Removed 276, marked the ones I've been on

[oscar]

In Virginia:

64, 66, 77, 81, 85, 95

264, 464, 564, 664, 381, 581, 195, 295, 395, 495

Total of 16.

[Buck87]

I'll take this as an opportunity to try to name all the interstates in my state off my head

2di:
70, 71, 74, 75, 76, 77, 80, 90 (8)

3di:
270, 470, 670
271, 471
275, 475, 675
276
277
280, 480, 680
490 (14)

Total: 22

You almost got it.

We have 21 (8 2di and 13 3di).

There's no I-276 in Ohio.

[SkyPesos]

I'll take this as an opportunity to try to name all the interstates in my state off my head

2di:
70, 71, 74, 75, 76, 77, 80, 90 (8)

3di:
270, 470, 670
271, 471
275, 475, 675
276
277
280, 480, 680
490 (14)

Total: 22

You almost got it.

We have 21 (8 2dia and 13 3di).

There's no I-276 in Ohio.

I just realized that right before I reloaded the page and saw your response lol. Don't know where I got 276 from.

Also are we like one of the few states with a lot of 3di, but no odd hundred digit ones? I noticed that when writing out my list. Though 562 would look nicer by adding 9 and making it I-571 with a red and blue shield, but that's fictional territory

[Ben114]

2di:
84, 90, 91, 93, 95

3di:
190, 290, 291, 391, 195, 295, 395, 495

13 total

[gonealookin]

Nevada gained two signed interstates in the 2010s, an increase of 50% in the decade!

I-11 (first shields posted in 2017)
I-15
I-80
I-215
I-515
I-580 (first shields posted in 2012)

[Ketchup99]

I'll try PA from memory:

79 (279, 579), 99, 81, 83 (283), 95 (295), 70, 76 (176, 276, 376, 476, 676), 78, 80 (180, 280, 380), 86, 90

So 23, unless I'm missing any, which I probably am.

[thspfc]

Eight. Half of them are very controversial in one way or another. People here think I-39 has two many multiplexes. They think I-41 is useless, or should be a 3di . . . is there even reasoning at all? (spoiler: there's not) I-894 is double-multiplexed its entire length. I-794 faced major opposition at the time it was built.

[SkyPesos]

Eight. Half of them are very controversial in one way or another. People here think I-39 has two many multiplexes. They think I-41 is useless, or should be a 3di . . . is there even reasoning at all? (spoiler: there's not) I-894 is double-multiplexed its entire length. I-794 faced major opposition at the time it was built.

I place the blame for the 2di Wisconsin's interstate controversies at IDOT. The midwest grid breakers I-41 and I-43 should've been an extension of 55, 57 or 65 since day one; guess who doesn't want to cooperate

[Great Lakes Roads]

I'll take a shot of Indiana's interstates.

2di's: 64, 65, 69, 70, 74, 80, 90, 94

3di's: 164, 265, 275, 465, 469, 865

So, we have 8 mainline interstates and 5 (formerly 6) auxiliary interstates. That's a total of 13 interstates (formerly 14) in Indiana.

Edit to add:
I'll take a shot on Illinois's interstates as well.

2di's: 24, 39, 41, 55, 57, 64, 70, 72, 74, 80, 88, 90, 94

3di's: 155, 172, 180, 190, 255, 270, 280, 290, 294, 355, 474, *490*

So, Illinois has 13 mainline interstates and 11 (12 by 2025) auxiliary interstates. That's a total of 24 interstates (25 by 2025) in Illinois.

[Crown Victoria]

I'll try PA from memory:

79 (279, 579), 99, 81, 83 (283), 95 (295), 70, 76 (176, 276, 376, 476, 676), 78, 80 (180, 280, 380), 86, 90

So 23, unless I'm missing any, which I probably am.

You have the total number correct (23), but you missed I-84, and there's no I-280 currently in PA.

[corco]

I have absolutely no idea.

[cl94]

Six bajillion.

[US 89]

Isn't this what Wikipedia is for?

[Max Rockatansky]

Too many, California went way overboard with non-chargeable 3ds.

[sprjus4]

Since Virginia was already posted, here's the next closest - North Carolina.

This list includes current and future (not currently signed) routes. Combined, 9 mainline interstate highways, 14 auxiliary interstate highways, for a total of 23 interstate highways across the state.

I-26, I-40 (I-140, I-240, I-440, I-540, I-840), I-42, I-73, I-74 (I-274), I-77 (I-277), I-85 (I-285, I-485, I-785, I-885), I-87 (I-587), I-95 (I-295, I-795)

[FrCorySticha]

Montana is easy: 3 2di, 2 3di

2di: I-15, I-90, I-94
3di: I-115, I315

[Caps81943]

I'll just go ahead and try VA from memory for fun.

2di: 95-64-66-81-77 Future: 74-87-73

3di: 581-781-381-495-395-264-295-664-464-164-564

Let's see how I did.

2di: Drat, I forgot 85!

3di: Forgot 195, no 164, no 781. TIL a 785 is planned.

All in all 6 2di + 10 3di = 16 total, with three more in the future (2 2di and 1 3di)

[jp the roadgeek]

CT is pretty quick

2di: 84, 91, 95

3di: 291, 384, 395, 684 (thought I'd forget, didn't you ), 691

So 3 2di and 5 3di = 8.  But for most purposes, we count 7.

Former/Once proposed (to be built or numbered):

82: An old working number for 84 to Providence
86: Many of us know about it. East Hartford-Sturbridge section of I-84 and was to connect to I-91 via extended CT 3 expressway
87: The original number for I-684
284: A proposed highway parallel to US 5 as an extension of CT 2
290: The number once proposed for the northern half of I-395.
484: Once was proposed for the Conland-Whitehead Highway when it was to extend under Bushnell Park
491: Another number used for the CT 3 expressway and extension to I-84 in East Hartford
495: Would have come here if one of the Cross Sound Bridge options that used it was built.

[TheStranger]

Too many, California went way overboard with non-chargeable 3ds.

Let's see if I can remember off the top of my head:

I-5: I-105, I-205, (I-305), I-405, I-505 originally planned as I-5W, I-605, I-805.  FUTURE: 905.   FORMER: I-105 (unsigned) along US 101 segment of Santa Ana Freeway
(future I-7 or whatever Route 99 is planned to be numbered as if that ever is upgraded to Interstate)
I-10: I-110, I-210, I-710.  FORMER: I-110 (unsigned) along San Bernardino Freeway between US 101 and I-5
I-15: I-215 formerly known as I-15E
I-40
I-80: I-280, I-380, I-580 (formerly I-5W), I-680, I-780, I-880, I-980.  FORMER: I-480, original I-880 in Sacramento.

17 currently signed, 1 unsigned, and one 3di and one potential 2di that could be signed in the future.  6 former designations (I-5W, I-15E, I-480, original I-880, original I-105, original I-110).

EDIT:  I forgot one, and it's the most hilariously obvious one in retrospect. 

I-238!  Makes that 18 currently signed.

Also, today's I-580 between San Rafael and Albany (the former Route 17) was provisionally designated as I-180, but never signed, around 1981.  (It was shown on the Rand McNally atlas of the time).  Does this count?

ALSO I did forget two more from LA.

[jp the roadgeek]

Too many, California went way overboard with non-chargeable 3ds.

Let's see if I can remember off the top of my head:

I-5: I-105, I-205, (I-305), I-405, I-505 originally planned as I-5W, I-605, I-805.  FUTURE: 905. 
(future I-7 or whatever Route 99 is planned to be numbered as if that ever is upgraded to Interstate)
I-10: I-110, I-210, I-710
I-15: I-215 formerly known as I-15E
I-40
I-80: I-280, I-380, I-580 (formerly I-5W), I-680, I-780, I-880, I-980.  FORMER: I-480, original I-880 in Sacramento.

17 currently signed, 1 unsigned, and one 3di and one potential 2di that could be signed in the future.  4 former designations (I-5W, I-15E, I-480, original I-880).

Love how you (intentionally?) left off everybody's favorite CA interstate

[TheStranger]

Too many, California went way overboard with non-chargeable 3ds.

Let's see if I can remember off the top of my head:

I-5: I-105, I-205, (I-305), I-405, I-505 originally planned as I-5W, I-605, I-805.  FUTURE: 905. 
(future I-7 or whatever Route 99 is planned to be numbered as if that ever is upgraded to Interstate)
I-10: I-110, I-210, I-710
I-15: I-215 formerly known as I-15E
I-40
I-80: I-280, I-380, I-580 (formerly I-5W), I-680, I-780, I-880, I-980.  FORMER: I-480, original I-880 in Sacramento.

17 currently signed, 1 unsigned, and one 3di and one potential 2di that could be signed in the future.  4 former designations (I-5W, I-15E, I-480, original I-880).

Love how you (intentionally?) left off everybody's favorite CA interstate

LOL, it was not intentional!  Not at all!  And I've been on 238 many many many times, I just forgot. LOL

[TheHighwayMan3561]

7. Or 8. Or 9. Everybody's got their own opinion and they're all wrong.