Rather than lots of difficult coordination, why not go a simpler route and make it based on the last digit or two of the street address? It's not a perfect plan

Rather than lots of difficult coordination, why not go a simpler route and make it based on the last digit or two of the street address? It's not a perfect plan, and some smoothing out may be needed to account for the distribution of addresses in a city / state / region, but the plus side is it can be done immediately and without need to figure out what others are up to. Or maybe not the street address ... use the lat-lon, or phone #, etc.