Yeah, there’s a moderately active lemmy.ml community for Denver. By moderately active, I mean there’s about a post or two every day and they tend to get 10-15 upvotes.
By contrast, the Denver subreddit gets about 15 posts an hour with popular posts having 2-600 upvotes. There are also highly active subreddits for surrounding areas such as Boulder, where popular posts garner 150 or so upvotes. I’m aware of 3 different attempts to create Lemmy communities for Boulder. The only one with ANY activity had a post 15 days ago that garnered 15 upvotes. The previous post is from 5 months ago.