On Facebook, find the Moms Run This Town/She Runs This Town group for your area. They do group runs at a variety of paces and it's a supportive group.

Washington Running Club has some of the nicest people - all ages and abilities welcome. They are best known for their all comers runs on Sunday mornings in Georgetown.
https://www.washrun.org/

Now that I work from home, I am looking for a weekday running partner in NW DC, ideally near Peirce Mill. Over 45, 10 min mile pace. A 30-40 min run workday mornings around 8:30 with company would be fantastic.

Potomac River Running has running groups

MCRRC is great, but often meet in Rockville for weekly track workouts. Longer runs are all over the county - some as close as Candy Cane and some as far as Darnestown or Needwood. It's probably worth the drive!

MCRRC. I think DC has a similar one. Check out "clubs" on Strava, there is a list and you can probably find ideas on there.

Are there any beginner specific running clubs in the DC area? I recently picked up again after years of no running and would love to find some similarly slowpoke folks to do group runs with. I’m a 40-something chubby mom and none of my friends have an interest in picking this up with me. In NW DC but I’d be willing to join groups in NOVA or MoCo if they were a good fit otherwise. Thanks for any leads!