From St. Petersburg to St. Pete Beach, A19A comprised the entirety of SR 682 as part of the Pinellas Bayway toll road. Within St. Pete Beach, A19A followed the portion of SR 699 from the Bayway to 75th Street. From St. Pete Beach, A19A followed and the entirety of SR 693 (75th Street (St. Pete Beach), South Pasadena Boulevard and 66th Street (St. Petersburg)), going northward until it reaches its terminus at US 19 in Largo, between SR 686 (East Bay Drive / Roosevelt Boulevard) and SR 688 (Ulmerton Road).
