States with a 3dus, but no root 2dus

[KEK Inc.]

US-101 is a root 2dus obviously.  3dus routes with outdated or obsolete 2dus count too, but please put an asterisk (*). 

- US-195 in Washington.
- US-199*
- US-491*
- US-395 in Washington.
- US-730 in Washington.

[roadman65]

US 224 in PA.
US 219 in NY and PA it does not meet its parent
US 119 in PA where it ends at US 219
US 220 of course
US 311

[agentsteel53]

US-138*

US-202 south of Maine and New Hampshire

[roadman65]

US 206 in New Jersey
US 158 in North Carolina

[Rover_0]

Utah:
US-491* (formerly US-666)
US-160 (has since been rerouted into Arizona)

Arizona:
US-180*
US-191*

Colorado:
US-138*
US-160

New Mexico:
US-180*
US-285* (according to NMDOT)
US-380*
US-550

Montana:
US-191*
US-310*

Wyoming:
US-191
US-310*

That's all off the top of my head.

[bugo]

US 271 in Oklahoma.
US 159 in Nebraska.

There are hundreds of examples of this, and this thread is going to go on forever.

[Speedway99]

US 136 in Nebraska. Also, in the 1920's, there was once a US 164 in Texas, which no longer exists. US 64, in a concurrency with US 56 and US 412, come so close into entering Texas, literally within inches, but do not actually enter. None of the three ever enter Texas.

EDIT: Could you please post links to the Topo maps you used, Stalin.

[bugo]

EB 56/64/412 enter Texas (the corner is near the centerline) but WB 56/64/412 do not enter Texas.  This is according to topo maps of the area.

[Ian]

US 301 in Delaware

[NE2]

Many on http://www.usends.com/Admin/violations.html count. But US 101 is just Dale being anal.

[WNYroadgeek]

US 219 enters New York, but US 19 doesn't.

[JCinSummerfield]

In Michigan, it's US-127.

[OracleUsr]

US 123 in South Carolina
US 258 in North Carolina

[NWI_Irish96]

US 421 in Indiana.
US 119 and US 150 in Kentucky.

[Road Hog]

US 412 across several states in the South. Also US 425 in Louisiana and Arkansas.

[vdeane]

I would think there's a zillion of these, given that there is no requirement for a 3dus to not act like a 2dus (unlike with interstates).

What IS the difference between a "mainline" and "spur" US route anyways?

[hbelkins]

US 421 in Indiana.
US 119 and US 150 in Kentucky.

Also US 421 in Kentucky.

West Virginia serves up US 220 in this category.

[Darkchylde]

Louisiana has US 167, but US 67 never enters it.

Oklahoma has US 287, but US 87 doesn't enter it.

Not a true case, since AASHTO has US 87 passing through Colorado, but Colorado doesn't acknowledge the existence of US 87 officially within the state, so US 287 could also count there depending on who you go by.

[hbelkins]

Oh, and every state through which US 400, 412 and 425 pass.

[corco]

Rover- You can add 212 to Wyoming.

Then there's 195 and 395 in Washington

[Darkchylde]

Doing some research, I can add a couple more:

US 278 enters Arkansas, but US 78 does not

US 178 enters North Carolina, but US 78 does not

[CNGL-Leudimin]

West Virginia serves up US 220 in this category.

As well as MD, VA and NC.

US 209 enters PA, where US 9 has never existed.

And the entire US 163. US 63 has never entered UT nor AZ.

[Darkchylde]

Couple more:

Both US 231 and 331 both enter Florida, but US 31 doesn't.

In fact, the previous US 331 also entered Florida, but its parent didn't.

US 441 cuts through North Carolina, but US 41 doesn't come anywhere near entering it.

[agentsteel53]

And the entire US 163. US 63 has never entered UT nor AZ.

US-163 is not a child of US-63; it's just an independent number chosen to upgrade UT-163.

US-491 exists in NM, CO, and UT.  US-91 does not exist in NM and CO, and it is on the other side of the state in UT (even its old extended format was elsewhere).  US-191, which is US-491's logical parent, does not enter CO or NM either.

[agentsteel53]

Rover- You can add 212 to Wyoming.

US-12 was once in Wyoming... it ran where US-212 does now!

Then there's 195 and 395 in Washington

the end of US-195 at US-95 used to be in Washington, but a curve straightening moved it over the state line to Idaho.

I've never seen a state-named Washington US 95 - that would be one of the rarest shields out there.