Census blocks are not that big. There are 7M of them. You can see them in NYC here: https://popfactfinder.planning.nyc.gov/#11.61/40.764/-73.9911 https://popfa

Census blocks are not that big. There are 7M of them. You can see them in NYC here: https://popfactfinder.planning.nyc.gov/#11.61/40.764/-73.9911 https://popfactfinder.planning.nyc.gov/#11.61/40.764/-73.991... Things like parts of Central Park and Piers are there own blocks. So, unless they capture homeless people living there, the population is zero. My guess is in places like SD there are still plenty of farm areas, commercial areas, schools etc which have no people. South Dakota looks like it has 80k census blocks and 800k people.