Highest-numbered route you have been on

[I-55]

Highest Signed by state:

AL - 275
AR - 367
FL - 536
GA - 21
IL - 133
IN - 933
IA - 415
KY - 3005
LA - Interstate 220 (the ONLY places in LA that I have been in are the westbound lanes of I-20 and I-220)
MD - 295
MI - 66
MN - Whatever runway number at MSP I was on, if that's even a thing
MS - 763
MO - 84 (the only one I've been on)
NE - 64
NJ - 495
NM - 599
NY - 495
NC - US-441 (never been on an NC state route)
OH - 850
PA - No Idea. Probably went on one when I was too young to remember anything. My last 2 have avoided state routes
SC - 261
TN - 449
TX - 121
VA - Interstate 81 (never been on VA state routes)
WV - 817

US - 521

Interstate - 865

[Scott5114]

Mine is probably FM 2279. I'm not a regular connoisseur of FMs so I'd be surprised if there was anything higher.

I've been on Route Z in Missouri. How do you count that? 

If sticking with primary routes, IN 912.

[kphoger]

I've been on Route Z in Missouri. How do you count that? 

And I've been on PP Hwy in Missouri.  Is that higher or lower than Z Hwy?   

[SkyPesos]

I've been on Route Z in Missouri. How do you count that? 

And I've been on PP Hwy in Missouri.  Is that higher or lower than Z Hwy?   

I'll say it's higher, because each letter P is the number 210 in my mind

Which matches up with this picture, aka the peak of 'funny' highway number combinations.

[oscar]

For me, probably Virginia secondary 10292 (Nutley St. in Fairfax, between US 50 and US 29), though there are higher numbered SRs in Northern Virginia. Not counting the unsigned fictional 9xxxx numbers devised by VDOT for some Federal Government highways it didn't build and doesn't maintain. 

If we're counting unsigned inventory numbers like VDOT's for Federal roads, I can do better with Alaska DOT&PF's inventory numbers for its own roads. The highest, AFAIK, is 299550 (Broadway in Skagway, which is part of signed AK 98). The highest for a road I've driven (and clinched), that doesn't have a signed state route number, is 297050 (Dangerous River Rd. in Yakutat). I might also have driven at least part of 299520 (Skagway-Dyea Road).

The lowest Alaska DOT&PF inventory number is 50000, for a road in Dillingham. All of the five-digit numbers seem to be in isolated western Alaska communities, with no road connections to the continuous North American highway network. 

[kphoger]

Which matches up with this picture, aka the peak of 'funny' highway number combinations.

A higher peak of 'funny' than the one in NE2's avatar?

[interstatefan990]

NY Route 987D (reference route), better known as the Saw Mill River Parkway.

I also write this as a fatal single-vehicle accident closed the southbound lanes of the parkway in Yonkers early this morning. RIP to the two teenagers that lost their lives.

[formulanone]

Which matches up with this picture, aka the peak of 'funny' highway number combinations.

A higher peak of 'funny' than the one in NE2's avatar?

Well, sharing is caring.

(Also: don't over-share.)

[sbeaver44]

I like the by state method, and I'm gonna go signed only, and ignore secondary systems

PA: 999
NY: 895 (ignoring ref routes)
MD: 924
DC: 695
NJ: 495 (not incl. CRs)
VA: 581
IN: 933
DE: 896
OH: 800
MI: 275
WV: 972 (no longer exists), 901 current
IL: 355
WI: 894
MN: 494
IA: 680
NE: 680
MO: 180
SD: 385
ND: 1804
MT: 200 (Primary Only)
ID: 200
WA: 526
OR: 205
CA: 805
NV: 515
AZ: 163
NM: 597
CO: 491
UT: 491
NC: 903
SC: 65
FL: 536
TN: 441
KY: 471 (using the "Primary"  list from Wikipedia.  I know I have been on KY 2345, for example)
CT: 395
RI: 146
MA: 495
NH: 202
VT: 91
ON: 427 (the QEW is technically 451 but again "signed as" )
WY: 110

[thspfc]

The highest that I know for sure is I-894, but I'be probably been on a 9xx in south Florida.

[SkyPesos]

G9411 in the Guangzhou area for me

In addition to my overall highest, here's mine for states I've at least driven through:
CA: I-880
CT: I-95
DC: I-695
DE: I-295
FL: FL 536
GA: I-675
IL: I-355
IN: I-865
KS: I-435
KY: KY 2345
MD: I-895
MA: MA 128
MI: I-696
MN: I-494
MO: I-670
NJ: NJ 495
NY: I-678
NC: US 501
OH: OH 835
PA: PA 743
TN: I-640
VA: I-495
WA: WA 526
WV: I-470
WI: US 151 (yes, I know it's lame compared to everyone that got I-894)

Canadian provinces:
BC: BC 99
ON: ON 427

Chinese provinces:
BJ: S12
FJ: S1531
GD: G9411
JS: G1522
SH: G1503
ZJ: G2504

[formulanone]

WI: US 151 (yes, I know it's lame compared to everyone that got I-894)

Relax, I didn't hit that one until last July...you've got plenty of time (besides, it's multiplexed with other routes the entire way).

[deathtopumpkins]

If we're doing by state now:
Alabama - I-565, US 72, AL 279
Arizona - I-15
Arkansas - I-55, US 270, AR 367
California - I-880, US 395, CA 254
Colorado - I-270, US 550, CO 470
Connecticut - I-691, US 202, CT 372
Delaware - I-495, US 301, DE 896
Florida - I-375, US 98, FL 9336
Georgia - I-95, US 280, GA 520
Idaho - I-184, US 30, ID 55
Illinois - I-294, US 51, IL 394
Indiana - I-469, US 150, IN 331
Iowa - I-280, US 65, IA 38
Kansas - I-670, US 400, KS 18
Kentucky - I-75, US 460, KY 3174
Louisiana - I-59, US 11
Maine - I-495, US 302, ME 238
Maryland - I-895, US 522, MD 835
Massachusetts - I-495, US 202, MA 295
Michigan - I-675, US 127, MI 55
Minnesota - I-90, US 218, MN 68
Mississippi - I-59, US 98, MS 43
Missouri - I-670, US 400, MO 366
Montana - I-90, US 310
Nebraska - I-80, US 77, NE 10
Nevada - I-15, US 93, NV 372
New Hampshire - I-393, US 302, NH 286
New Jersey - I-676, US 322, NJ 440
New Mexico - I-40, US 285, NM 502
New York - I-890, US 219, NY 895 (was I-895 when I clinched it - highest was 878)
North Carolina - I-540, US 601, NC 751
Ohio - I-670, US 422, OH 576
Oklahoma - I-244, US 412, OK 102
Oregon - I-84, US 395, OR 201
Pennsylvania - I-676, US 522, PA 995
Rhode Island - I-295, US 44, RI 401
South Carolina - I-95, US 301, SC 170
South Dakota - I-190, US 385, SD 1806
Tennessee - I-269, US 441, TN 394
Texas - I-40, US 380, Loop 289
Utah - I-15, US 491, UT 95
Vermont - I-189, US 302, VT 346
Virginia - I-664, US 522, VA 895
West Virginia - I-81, US 522, WV 598
Wisconsin - I-94, US 141, WI 57
Wyoming - I-90, US 212, WY 116

New Brunswick - NB 95
Nova Scotia - NS 374
Ontario - ON 420
Quebec - A-973, QC 371

England - M275, A6120, B6480
Wales - M48, A4244, B5115
Scotland - M90, A9000 (was M90 when I clinched it - highest was A6106), B9169



I've noticed on a surprising number of these I have the highest numbered state highway, despite not having very much of the state. Seems a pattern that the highest number is either an important road or somehow outside of the state's normal numbering scheme, such that there are increased odds you've driven it over any other randomly numbered state highway.

[TheHighwayMan3561]

MN: I-694, US 218, MN 610
WI: I-894, US 151, WIS 794

[US 89]

Okay fine, I'll do by state:

Alabama: US 431
Arizona: SR 389
Arkansas: I-555
California: I-805
Colorado: US 550
DC: I-395
Florida: SR 536
Georgia: I-985
Idaho: US 93
Illinois: I-270
Indiana: I-65
Iowa: US 275
Kansas: US 400
Kentucky: KY 1747
Maine: I-95
Maryland: MD 355
Massachusetts: MA 128
Michigan: no roads
Minnesota: no roads
Mississippi: I-269
Missouri: I-670
Montana: S-487
Nebraska: US 275
Nevada: SR 659
New Hampshire: I-95
New Jersey: no roads
New Mexico: NM 597
New York: I-678
North Carolina: NC 904
Oklahoma: I-444
Oregon: US 395
South Carolina: US 701
South Dakota: I-229
Tennessee: US 411
Texas: FM 2855
Utah: SR 319
Virginia: VA 90005 (I-395 if you don't want to count that)
Washington: SR 522
Wyoming: WYO 789

Internationally -
England: A5201

[epzik8]

Alabama: N/A
Alaska: AK 7
Arizona: N/A
Arkansas: I-540 (now I-49)
California: N/A
Colorado: US 287 (on concurrency with I-70)
Connecticut: US 202 (on concurrency with I-84)
Delaware: DE 896
Florida: FL 9336
Georgia: I-95
Hawaii: N/A
Idaho: US 91 (on concurrency with I-15)
Illinois: I-70
Indiana: I-70
Iowa: I-680
Kansas: US 283
Kentucky: US 68
Louisiana: N/A
Maine: I-395
Maryland: MD 924
Massachusetts: MA 140
Michigan: N/A
Minnesota: N/A
Mississippi: MS 302
Missouri: MO 367
Montana: US 191
Nebraska: I-680
Nevada: N/A
New Hampshire: US 302
New Jersey: NJ 347
New Mexico: N/A
New York: I-684
North Carolina: NC 903
North Dakota: N/A
Ohio: I-680
Oklahoma: US 60
Oregon: N/A
Pennsylvania: PA 997
Rhode Island: I-295
South Carolina: US 701
South Dakota: US 385
Tennessee: US 421
Utah: UT 319
Vermont: US 302
Virginia: I-664
Washington: WA 99
West Virginia: WV 901
Wisconsin: N/A
Wyoming: US 191

District of Columbia: I-695
U.S. Virgin Islands: VI 30

New Brunswick: NB 955
Nova Scotia: NS 105
Prince Edward Island: PEI 315
Quebec: QC 85

Quintana Roo: MX 307
Yucatan: MX 180

[Mapmikey]

Bold means the highest number in that state...

Alabama - 759
Alaska - N/A
Arizona - 202
Arkansas - 540
California - 905
Colorado - 287
Connecticut - 384
Delaware - 896
DC - 695
Florida - 9336
Georgia - 985
Hawaii - N/A
Idaho - 184
Illinois - 474
Indiana - 865
Iowa - 880
Kansas - 670
Kentucky - 3085
Louisiana - 1247
Maine - 495
Maryland - 995
Massachusetts - 290
Michigan - 496
Minnesota - 694
Mississippi - 607
Missouri - 670
Montana - 315
Nebraska - 81
Nevada - N/A
New Hampshire - 393
New Jersey - 676
New Mexico - 597
New York - 890
North Carolina - 906
North Dakota - 281
Ohio - 821
Oklahoma - 270
Oregon - 405
Pennsylvania - 999
South Carolina - 917
South Dakota - 385
Tennessee - 840
Texas - 820
Utah - 270
Vermont - 279
Virginia - 90005 or 895
Washington - 536
West Virginia - 956
Wisconsin - 155
Wyoming - 789

[dlsterner]

What the heck; I'll try doing this by state as well:

I'm going by signed highways only, using the Travel Mapping web site as my list.

Alabama - I-459
Arizona - US 93
California - I-405
Connecticut - US 202
Delaware - DE 896
DC - I-695
Florida - FL 997 (I have been on what is now FL 9336, but it was signed as FL 27 at the time)
Georgia - I-675
Indiana - I-465
Iowa - IA 165
Kentucky - KY 3085 (highest number overall for me)
Louisiana - US 190
Maine - I-495
Maryland - MD 953
Massachusetts - I-495
Michigan - I-296
Mississippi - I-220
Nebraska - I-480
Nevada - I-515
New Hampshire - US 302
New Jersey - US 322
New York - I-787
North Carolina - NC 903
Ohio - I-675
Pennsylvania - PA 997
South Carolina - I-520
Tennessee - I-640
Vermont - VT 279
Virginia - VA 895
West Virginia - WV 901

Canada (Ontario) - ON 417
Canada (Québec) - A-55
Iceland - TH-862

[jflick99]

Going in descending order and bolding highest in the state:

HI: HI 7110
GA: I-985
IN: IN 933
PA: PA 844
MO: MO 752
SC: SC 703
NE: I-680
KS: I-670
TN: I-640
NM: NM 609
CA: I-580
FL: FL 528
IA: I-480
CO: CO 470
VA: US-460*
AR: US-412
TX: TX Spur 366
AZ: AZ 303
IL: I-294
NC: NC 280*
OK: I-240
AL: US-80
KY: I-69
LA: US-61
WV: WV 27

*I have been on Future I-785 in VA and NC.