Pentagon City offers a 7–10 minute car commute to the Pentagon, with the added benefit of Pentagon City Metro station (Blue and Yellow Lines) inside the neighborhood for a sub-ten-minute walk. Crystal City’s car commute runs 10–15 minutes, with Crystal City Metro station providing a six-minute ride on the same lines. Both neighborhoods eliminate the need for a car on most days if you’re assigned to the Pentagon.
Read the full guide: Pentagon City vs. Crystal City: Where to Live When You’re PCSing to Arlington