Polk St & Post St (#15997) SFMTA.com/15997 Stop Messages 3/16 - 3/22: Early Market St. subway closure at 9:30pm. Sign up for text or email Muni alerts @ SFMTA.com/MuniAlerts Route & Arrival Details 19 Polk 5am - 10pm daily Destination Predicted Arrivals 19 Polk Beach Street Prediction unavailable Live Map