Mayors be able to define streets and plot "house numbers". Then an address could be looked up with a web panel to see who the owner of the plot is or name of it. Also these addresses could be shown on dynmap if wanted as defined in the config. This would be for the advanced players though.

So it would be like
/plot add address

/plot remove address
/plot edit address
/town add street
/town remove street

This is an interesting idea, but it seems like just organization for organization's sake. This seems like it'd be handled just fine by sticking signs in front of houses.

Either way, I don't wish to dedicate resources to implementing this right now unless it can offer more compelling functionality.