The NEO STC (Northeast Ohio Community of the Society for Technical Communication) is one of the most active STC communities in the U.S. This chapter has earned the Community Achievement Award for the past 15 years. Check out their newsletter here.
The Southeastern Michigan chapter (STC SM) recently earned the Platinum Community Achievement Award for 2019. They post every few days about an array of topics relevant to the community.
The STC Rochester chapter was founded in 1958 and is based in upstate New York. STC Rochester is a Platinum Community and was also awarded with Community of the Year for 2019. You can find out more about their events here.