Route 423 provides local circulator service between Tysons Metro Station and Tysons West*Park Transit Station. The route travels primarily along the Westpark Drive, International Drive, and Jones Branch Drive corridors.

Popular locations along the route include:

• Freddie Mac HQ 2
• Kaiser-Permanente
• Hilton McLean-Tysons Corner
• Tysons Galleria (South Side)
• The Rotonda Condos
• Valo Business Park 

An accessible version of the full timetable is provided in the tabs below.