I don't know about other states but I know here in SA every council is
required by law to have such a list and make it available in request.
Usually for a fee of course. Luckily my local council (Salisbury) has a
very similar list online (URL Below) which has helped me sort out the
"exactly where does one road end and another begin" issue a couple of
times. Even include official road widths but I'm not sure if copying
them all over would be appropriate.
Haven't had much luck finding it for other adjacent councils...yet.. :)
It is very good. It (and OSM) are the only ones that are aware that a bit od Edgeware Road became Devonshire Road, back in the 60's
(Our house number changed then but I didn't realise the name change of that bit till I mapped it from the street signs last year.)
It is also the only online source that has "Druids Avenue" correct, in Stirling. All locals have know this name for over 50 years and all businesses advertise as this. However both street signs say "Druid Avenue". For the first, and only, time so far, I have tagged according to local knowledge in precedence over the street sign.