Nextdoor Stats and Facts
Nextdoor is the private social network for you, your neighbors and your community. It’s the easiest way for you and your neighbors to talk online and make all of your lives better in the real world. And it’s free. (source)
Please note that some of these numbers are easier to find than others. A few of these stats come from the company’s own reports, but some are based on news reports and not official company tallies. Basically, this is the best I can find and I don’t guarantee anything to be 100% accurate.