This is actually a pretty good read as you can see state-by-state and city-by-city the towns that were Sundown Towns, and shows the population breakdown of Humans and niggers in the post Sundown Town world.

One of the areas I used to live in, was listed as a Sundown Town. But sadly you would never know it today, as the pavement apes have taken over and you can't even take 5 steps without one approaching you demanding their gibs

Link