State roads at your state's borders - how many keep the number across the line?

[kphoger]

Several numbered highways in Arkansas continue as lettered routes in Missouri as well.

This of routes that don't keep the same number would be rather long...

[GaryV]

Michigan - none

M-49 and OH-49

Dang it. I was looking at the official MI map and the road in OH isn't numbered.

Historically, I believe what is now US 41 used to be both Michigan and Wisconsin 15.

[TheHighwayMan3561]

Iowa and Minnesota sync up on most state routes crossing the line (4, 15, 26, 60, 76, 86, 91, 139)

MN/WI: listed above (the rest: MN 39/WIS 105, MN 48/WIS 77, MN 36/WIS 64, MN 60/WIS 25, MN 43/WIS 54)
MN/ND: 200, 210 (the rest: MN 175/ND 5, MN 11/ND 66, MN 317/ND 17, MN 1/ND 54, MN 55/ND 11)
MN/SD: none (MN 28/SD 10, MN 40/SD 20, MN 68/SD 22, MN 271/SD 28, MN 19/SD 30, MN 30/SD 34, MN 269/SD 11)

[kphoger]

Guess I might as well do Kansas.  Let me know if I made any errors.

Colorado border
51 – no (becomes a gravel county road)
96 - yes

Nebraska border
27 - yes
161 - close but no cigar (becomes 61)
25 - yes
117 - close but no cigar (becomes 17)
8 - no
128 - no
14 - yes
15 - yes
148 - no
99 - yes
63 - no
7 - no (becomes a county road)

Missouri border
92 - yes
68 - no
52 - yes
239 - no (secondary SRs in Missouri are lettered, not numbered)
126 - yes
171 - yes
66 - yes

Oklahoma border
99 - yes
15 - no
179 - no
8 - yes
1 - no
23 - yes
25 - no

[vdeane]

For Vermont, most do.  It's shorter to list the exceptions:

- The aforementioned Quebec routes.
- VT 105A/Unnumbered Quebec road
- VT 17/NY 185
- VT 31/Washington CR 25)
- VT 279/Unsigned NY 915G
- VT 113/Unnumbered New Hampshire road
- VT 105/Unnumbered New Hampshire road (but was technically signed as "VT 105" at one point)
- VT 114/Unnumbered New Hampshire road

I'm not counting the Lake Champlain ferries, since the ferry landings are not part of either state's system.

Worth noting that when Quebec did their great renumbering, Vermont renumbered most of the state routes in its side of the border to match.  The only exception was VT 108.

Not counting VT 100 or NH 103 since, in both cases, they are concurrent with other routes that do keep their number crossing the state line (8 and 12 respectively).

Don't forget VT 9/NY 7

[LilianaUwU]

For Vermont, most do.  It's shorter to list the exceptions:

- VT 105A/Unnumbered Quebec road

Of note is that it did continue as QC 105A before the mid-70s renumbering, one of the only 3-digit numbers back then.

[davewiecking]

54 bounces back and forth between MD and DE.
404, 16 and 300 cross the state line.
DE-896 turns into MD-896, which then becomes PA-896.

707, 780, 711 and 713 (multiple times) cross the MD/VA border. VA 679 appears to partially (westbound lane) cross into MD.

WV 24/3, 12/2 and 12/1 keep the dual numbers into MD, as does single-numbered 12. 12/7 seems to be multiple roads which bounce back and forth.

[SEWIGuy]

Michigan - none

M-49 and OH-49

Dang it. I was looking at the official MI map and the road in OH isn't numbered.

Historically, I believe what is now US 41 used to be both Michigan and Wisconsin 15.

And US-45 used to be WI-26 and M-26.

[jp the roadgeek]

In MA-RI, it appears that all routes keep their numbers across state lines with the sole exception of RI-100 in Burrillville that ends at the state line with Douglas, MA.

Also RI 5.  Becomes a local road in Millville, MA. 

[IowaTraveler]

Here are the results for Iowa:

IA-MN:
Formerly, IA 91 & MN 91
IA 60 & MN 60
IA 86 & MN 86
IA 4 & MN 4
IA 15 & MN 15
IA 27
IA 139 & MN 139
IA 76 & MN 76
IA 26 & MN 26

IA-WI:
IA 9 & WI 82

IA-IL:
IA 64 & IL 64
IA 136 & IL 136
IA 92 & IL 92
IA 163
Formerly, IA 2 & IL 9

IA-MO:
IA 27 & MO 27
IA 81 & MO 81
IA 202 & MO 202
IA 5 & MO 5
IA 148 & MO 148

IA-NE:
IA 2 & NE 2
IA 92 & NE 92
IA 165 & Abbott Drive
IA 175 & NE 51

IA-SD:
IA 3 & SD 50
Formerly, IA 403 & SD 48
IA 10 & SD 46
IA 9 & SD 42

Out of the 25 current state highways in Iowa that cross a border, 17 of them keep their number in the neighboring state (So, over 2/3 of them). It makes sense for it to be a fairly high portion of highways, since Iowa has historically put a heavy emphasis on route continuity with neighboring states (To the point where the original establishment of Iowa's highway system in 1920 prioritized route continuity over creating a numbering system).

EDIT: Added IA 92 - NE 92 border crossing and adjusted summary accordingly.

[ilpt4u]

I'll give Illinois a whirl, while leaning on previous posts to help

IL-IA was listed right above by IowaTraveler

IL-IN was covered by Great Lakes Roads, with a "none"

IL-KY is a "none" :
IL 13/KY 56
IL 1/KY 91

IL-MO has at least one:
IL 110/MO 110 (The CKC is good for something)
IL 146/MO 74
IL 150/MO 51 (this one is kinda an anagram)
IL 3/MO 115 (kinda but not really)

IL-WI I count 3 (and a half, for 131/31)
IL 35/WI 35
IL 84/WI 80
IL 78/WI 78
IL 26/WI 69
IL 2/WI 213
IL 75/WI 67
IL 76/WI 140
IL 47/WI 120
IL 83/WI 83
IL 131/WI 31 (at least related)
IL 137/WI 32

IL and MI don't share a ground border nor a bridge/tunnel/ferry crossing for Lake Michigan, so that is a "none"

Illinois doesn't have a lot, but a bit more with land bordering Wisconsin than water bordering Missouri and Kentucky. None with partially land partially water bordering Indiana

[Bruce]

Washington

WA/BC:
WA 543/BC 15
WA 539/BC 13 - WA 539 was formerly SSH 1B, which almost counts
WA 9/BC 11
WA 21/BC 41 - WA 21 was formerly SSH 4A
WA 25/BC 22 - WA 25 was formerly PSH 22
Old WA 251/BC 22A - WA 251 was formerly SSH 22A
WA 31/BC 6 - WA 31 was formerly PSH 6

Prior to the 1964 renumbering, Washington/BC would have had 3 actual and 2 borderline crossings with continuous numbers. At least the US routes carry over.

WA/ID:
WA 41/ID 41 - Numbered for ID 41, but also fits the grid
WA 290/ID 53
WA 278/ID 58
WA 274/ID 60
WA 272/ID 6
WA 128/ID 128 - Numbered for WA 128

WA/OR:
WA 129/OR 3 - WA 129 was formerly part of PSH 3
WA 125/OR 11
WA 35/OR 35 - WA 35 only exists in theory, not signed or maintained by the state
WA 433/unnumbered ramps to US 30

[DandyDan]

Here are the results for Iowa:

IA-MN:
Formerly, IA 91 & MN 91
IA 60 & MN 60
IA 86 & MN 86
IA 4 & MN 4
IA 15 & MN 15
IA 27
IA 139 & MN 139
IA 76 & MN 76
IA 26 & MN 26

IA-WI:
IA 9 & WI 82

IA-IL:
IA 64 & IL 64
IA 136 & IL 136
IA 92 & IL 92
IA 163
Formerly, IA 2 & IL 9

IA-MO:
IA 27 & MO 27
IA 81 & MO 81
IA 202 & MO 202
IA 5 & MO 5
IA 148 & MO 148

IA-NE:
IA 2 & NE 2
IA 165 & Abbott Drive
IA 175 & NE 51

IA-SD:
IA 3 & SD 50
Formerly, IA 403 & SD 48
IA 10 & SD 46
IA 9 & SD 42

Out of the 24 current state highways in Iowa that cross a border, 16 of them keep their number in the neighboring state (So, 2/3 of them). It makes sense for it to be a fairly high portion of highways, since Iowa has historically put a heavy emphasis on route continuity with neighboring states (To the point where the original establishment of Iowa's highway system in 1920 prioritized route continuity over creating a numbering system).

Formerly, IA 370 and NE 370 linked up, but that went away when the current US 34 bridge was built south of Bellevue.

Iowa made a conscious effort to have the numbers not change at the border with the 1969 renumbering.

[Bitmapped]

WV 24/3, 12/2 and 12/1 keep the dual numbers into MD, as does single-numbered 12. 12/7 seems to be multiple roads which bounce back and forth.

No, they don't. Those are county route numbers specific to Preston County, West Virginia. Those numbers showing in Garrett County in Google Maps is because of a bad job by Google Maps, not an indication those numbers are carried across. Same thing with CR 12/7 - there's just one road with that number.

[Bitmapped]

*LSR-857 in Monongalia County is the only LSR route that is only in one county.  If I my suspicions are correct, the designation LSR is supposed to mean "long secondary route" where the number stays the same between counties.  The other two that I know of are LSR-21 (former US-21) in Kanawha, Jackson and Wood counties; and LSR-73 (former WV-73) in Marion and Monongalia counties.

The "LSR" routes get signed with shields comparable to what is done with a WV route, although internally they are still considered part of the county route system. Numbers do get coordinated across county lines. There is also a "LSR"-type CR 151 along the former route of US 33 between Buckhannon and Norton in Upshur and Randolph Counties.

CR 73 (old WV 73) between Morgantown and Fairmont isn't treated like a LSR. It's just a plain old county route where they happened to use the same number in both counties on adjoining segments since the number was available in both counties. Other than a one-off at the US 119 intersection, it doesn't get state route-like signage.

There are other sections of former WV 73 in both Marion and Monongalia that get fractional route numbers since they aren't connected to that segment of CR 73. The CR 73/73 number for the Coopers Rock area segment in Monongalia County continues into Preston County.

[gonealookin]

Nevada (4/17)

Oregon border (1/2)
NV 140/OR 140
NV 292/county road in Harney County

Idaho border (0/1)
NV 225/ID 51

California border (3/10)
NV 28/CA 28
NV 88/CA 88
NV 338/CA 182
NV 359/CA 167
NV 264/CA 266
NV 266/CA 266
NV 267/NPS road in Death Valley N.P.
NV 373/CA 127
NV 372/CA 178
NV 164/County road in San Bernardino County

Utah border (0/3)
NV 233/UT 30
NV 487/UT 21
NV 319/UT 56

Arizona border (0/1)
NV 163/AZ 95

[hbelkins]

*LSR-857 in Monongalia County is the only LSR route that is only in one county.  If I my suspicions are correct, the designation LSR is supposed to mean "long secondary route" where the number stays the same between counties.  The other two that I know of are LSR-21 (former US-21) in Kanawha, Jackson and Wood counties; and LSR-73 (former WV-73) in Marion and Monongalia counties.

The "LSR" routes get signed with shields comparable to what is done with a WV route, although internally they are still considered part of the county route system. Numbers do get coordinated across county lines. There is also a "LSR"-type CR 151 along the former route of US 33 between Buckhannon and Norton in Upshur and Randolph Counties.

CR 73 (old WV 73) between Morgantown and Fairmont isn't treated like a LSR. It's just a plain old county route where they happened to use the same number in both counties on adjoining segments since the number was available in both counties. Other than a one-off at the US 119 intersection, it doesn't get state route-like signage.

There are other sections of former WV 73 in both Marion and Monongalia that get fractional route numbers since they aren't connected to that segment of CR 73. The CR 73/73 number for the Coopers Rock area segment in Monongalia County continues into Preston County.

I'm curious as to how many of the county routes get signed like they were primary state or US routes.

CR 120 is signed at the junction of US 52 near Bramwell. CR 73, CR 151, CR 857, and of course CR 21 have been mentioned. I know there's independent signage for CR 507 near Weirton, and possibly another route in the northern panhandle.

[jp the roadgeek]

Since MA-CT and MA-RI have been done, I'll do the rest of MA's borders

MA-NY

Roads that do: 23, 71, I-90, 295, US 20, 43, 2
Roads that do not: NY 344, MA 102

MA-VT

Road that do: US 7, 8, 8A, 112, US 5, I-91, 142
Roads that do not: NONE

MA-NH

Roads that do: 63, 10, 78, 32, 12, US 202, 119, 31, 13, 111, US 3, 3A, 38, I-93, 28, 97, 125, 121A , 108, 150, I-95, US 1, 286 (3x), 1A

Roads that do not: NH 123A, NH 124, NH 128, NH 121

[Dirt Roads]

CR 120 is signed at the junction of US 52 near Bramwell. CR 73, CR 151, CR 857, and of course CR 21 have been mentioned. I know there's independent signage for CR 507 near Weirton, and possibly another route in the northern panhandle.

You are correct.  There is also CR-208 that runs east-west between WV-2 at the Mountaineer Racetrack near New Cumberland and the Hilltop Drive-in Theatre on WV-8 near Chester.  By the way, both CR-507 and CR-208 are shown as LSR routes in the most recent route log (2015), as are CR-120 and CR-151.  CR-707 to the FBI Fingerprinting Center north of Clarksburg is also shown as an LSR route.  All of which are in singular counties.  Oops.

[Flint1979]

Michigan - Just one. M-49 and OH-49.

[froggie]

MA-VT

Roads that do not: NONE

I did Vermont upthread.  And while I didn't count VT 100 because it's concurrent with VT 8, one could argue that VT 100 fits the bill of a state road that doesn't keep its number across the line.

[Bickendan]

Oregon:
Port Cathalmet Ferry/WA 409. Oregon side not numbered.
Lewis and Clark Bridge/WA 433 technically, WA 433 physically enters Oregon and ends where the roadway makes land fall just north of the US 30 interchange
Bridge of the Gods; unnumbered on both sides.
OR 35/WA 35 not signed as such on the Washington side
OR 332 - ends at a T intersection on the stateline
OR 339/Old Milton Highway - unnumbered on Washington side. Former (precursor to?) WA 125?
OR 11/WA 125
OR 3/WA 129

OR 86/NF 452
Brownlee-Oxbow Hwy/ID 71; despite OSM's claims, not OR 71 on the Oregon side, and not part of the ORH system. However, at some point I'll do a field check when I do my OR 86 clinch...
OR 52/ID 52
OR 452/Stateline Rd
OR 453 straddles the OR/ID border along Stateline Rd for a mile. technicality
OR 454/Red Top Rd
OR 201/ID 19

Fields-Denio Rd/NV 292
OR 140/NV140

ORH 50/CR 114
OR 39/CA 139
CA 161; straddles OR/CA border for several miles. technicality

[tsmatt13]

NJ's borders:

NJ-NY:

Roads that do: 495, 440, 17, 94, 284
Roads that do not: NY-340 (road continues as a country route), NY-303, NY-304, NY-45, NY-210, NJ-23

NJ-PA:

Roads that do: 179, 413, 73, 90
Roads that do not: The other end of NJ-94  , PA-263, PA-532*

*PA-532 ends a little before the bridge to NJ but still very close to the border*

So it seems like NJ is generally even with roads that do and roads that do not cross the border. This was quite interesting to do! 

[WillWeaverRVA]

VA-/KY-80

There is also MO 80, which used to connect to KY/VA 80 via a ferry that is no longer in service.

[jp the roadgeek]

NJ-PA:

Roads that do: 179, 413, 73, 90

Nope.  PA does not duplicate interstate and state routes unless created by a renumbering.  PA has I-90 (yes, it's almost 400 miles away, but it's there).