Welcome to DC!
FWIW: Consider Montgomery County, MD near the Capital Crescent Trail. The CCT is a 10 mile rails-to-trail paved route from downtown Bethesda to the DC waterfront. Those riders working in VA continue on the Arlington Bridge into VA. The Potomac Pedalers is a cycling enthusiasts club offering over 1,000 rides for all class of riders (A-D) throughout the DMV. They might have good ideas on commuting, too.
BTW, find time to ride Skyline Drive in the Shenandoah NP. I try and ride it once a year. It’s a sacred experience for me. Also, the Garrett County Gran Fondo will kick your butt!
