Si's summary is for maintenance of existing route systems (Interstate/US/state/TCH/provincial/territorial, etc. routes) in those jurisdictions, for the updating and catching-up efforts underway. I've marked with a * jurisdictions for which, AFAIK, there is neither a state/provincial/territorial route set in place, nor one "claimed" or in-development, that might be available once we've caught up on existing systems and can start ramping up new system development.
I mention this to underscore that some in some jurisdictions, their maintainers (including me, for three of my five Canadian jurisdictions) agreed to cover the existing systems there, but are not necessarily planning to develop new systems for those jurisdictions.
AK Alaska - oscar
AL Alabama - froggie *
AR Arkansas - yakra *
AZ Arizona - Nick
CA California - oscar
CO Colorado - Si
CT Connecticut - yakra
DC District of Columbia -
DE Delaware -
FL Florida - rickmastfan67
GA Georgia - rickmastfan67 *(?)
HI Hawaii - oscar
IA Iowa - jeffm
ID Idaho - Si
IL Illinois - jeffm
IN Indiana - Si
KS Kansas - yakra
KY Kentucky -
LA Louisiana - *
MA Massachusetts - Jim
MD Maryland -
ME Maine - yakra
MI Michigan - dfilpus
MN Minnesota - froggie
MO Missouri - jeffm
MS Mississippi - froggie *
MT Montana - Si
NC North Carolina - dfilpus, Mapmikey
ND North Dakota - yakra
NE Nebraska - yakra
NH New Hampshire - yakra
NJ New Jersey -
NM New Mexico - Jim Oscar
NV Nevada - Nick
NY New York - Jim
OH Ohio - dfilpus
OK Oklahoma - yakra
OR Oregon - Bickendan
PA Pennsylvania -
PR Puerto Rico - Si *
RI Rhode Island - yakra
SC South Carolina - rickmastfan67, Mapmikey
SD South Dakota - jeffm
TN Tennessee - rickmastfan67 *
TX Texas - yakra
UT Utah - Nick
VA Virginia - dfilpus, Mapmikey
VI Virgin Islands - Si *
VT Vermont - froggie
WA Washington - dfilpus
WI Wisconsin - jeffm
WV West Virginia - rickmastfan67
WY Wyoming - Si
AB Alberta - yakra
BC British Columbia - oscar *
MB Manitoba - yakra
NB New Brunswick - yakra
NL Newfoundland and Labrador - yakra *
NS Nova Scotia - yakra
NT Northwest Territories - oscar
NU Nunavut - oscar (if it ever builds any highways, which I do not expect in my lifetime)
ON Ontario - rickmastfan67
PE Prince Edward Island - yakra
QC Quebec - oscar *
SK Saskatchewan - oscar *
YT Yukon - oscar
Elsewhere - Si *