What is the highest numbered Highway in your State?

[Tom]

In Michigan, I believe the M-553 designation was removed after only a few years , giving the high number distinction to M-294.  Before that, M-247 held the honor for several decades.

[dfilpus]

In Michigan, I believe the M-553 designation was removed after only a few years , giving the high number distinction to M-294.  Before that, M-247 held the honor for several decades.

M-554 was removed in 2005, but M-553 remains. Anyway, the highest numbered highway in Michigan is I 696.

[bogdown]

There are FM and RM roads that get into the 4digits

EAdit: I mean in Texas

[Tom]

In Michigan, I believe the M-553 designation was removed after only a few years , giving the high number distinction to M-294.  Before that, M-247 held the honor for several decades.

M-554 was removed in 2005, but M-553 remains. Anyway, the highest numbered highway in Michigan is I 696.

Oops!  Thank you for the correction regarding M-553 and M-554.  Also, the highest U.S. highway number in Michigan is US-141.

[bogdown]

I know that an FM route about 20 feet from my home is FM 2551

[UptownRoadGeek]

I-610
U.S. 425
LA 3285

[dfilpus]

In Michigan, I believe the M-553 designation was removed after only a few years , giving the high number distinction to M-294.  Before that, M-247 held the honor for several decades.

M-554 was removed in 2005, but M-553 remains. Anyway, the highest numbered highway in Michigan is I 696.

Oops!  Thank you for the correction regarding M-553 and M-554.  Also, the highest U.S. highway number in Michigan is US-141.

What about US 223?

[NWI_Irish96]

Indiana

Interstate: I-865
U.S. Route: US 421
State Route: SR 933

Highest decommissioned road is SR 829

[Tom]

In Michigan, I believe the M-553 designation was removed after only a few years , giving the high number distinction to M-294.  Before that, M-247 held the honor for several decades.

M-554 was removed in 2005, but M-553 remains. Anyway, the highest numbered highway in Michigan is I 696.

Oops!  Thank you for the correction regarding M-553 and M-554.  Also, the highest U.S. highway number in Michigan is US-141.

What about US 223?

Oops.  I goofed again.  You're right.

[J N Winkler]

Highest FM road in Texas is (AFAIK) FM 3549, while highest RM road is RM 3474.

In Kansas I think the maxima are as follows:  I-635, K-383, and US 400.  K-383 is former US 383, so the "natural" maximum for Kansas state routes is probably one of the state-maintained spurs with a K-2XX designation in the mid-200's.  US 400 is essentially a fake two-digit route, so the "natural" maximum for US routes passing through Kansas is likely US 283.

[bulldog1979]

In Michigan, I believe the M-553 designation was removed after only a few years , giving the high number distinction to M-294.  Before that, M-247 held the honor for several decades.

Assuming you were limiting Michigan to the non-Interstates, and M-553 was renumbered, what about M-311 (now signed) and M-331 (still unsigned)?

[Tom]

In Michigan, I believe the M-553 designation was removed after only a few years , giving the high number distinction to M-294.  Before that, M-247 held the honor for several decades.

Assuming you were limiting Michigan to the non-Interstates, and M-553 was renumbered, what about M-311 (now signed) and M-331 (still unsigned)?

Yes, I was.  Also, because I forgot about US-223, and since Michigan's Upper Peninsula is, in some ways, unique to the rest of the state,  here are the highest numbers for the 3 different types of highways in the U.P.:

1.  M-553
2.  US-141
3.  I-75

[mightyace]

Tennessee:
Interstate: 640
US: 641 (not sure of this one, just did a quick scan)
State: 840