As you may have noticed, there’s not much activity in the OpenStreetMap Forum’s United States category. This doesn’t meant there’s no OSM mappers in the US, they just hang out in other places on the internet:
There’s several hundred folks active on the OpenStreetMap US Slack. You can join us there by heading to https://slack.openstreetmap.us.
You can also check out the new OpenStreetMap Community forum site or sign up for the talk-us mailing list.
Also, check out the OpenStreetMap local chapter in the United States: OpenStreetMap US.