Southside Bank Address: 20100 State Highway 155 S, Flint, TX 75762 Phone: (903) 825-6332 Banks, Loans, State Commercial Banks Other Businesses: Austin Bank at 16909 State Highway 155 S, Flint, TX 75762 Kilgore National Bank at 16921 FM 2493, Flint, TX 75762 Kilgore National Bank-Gresham at 16921 FM 2493, Flint, TX 75762 Allen, Thomas G PHD at 19479 County Road 1321, Flint, TX 75762