where does the interstate start
wherE does interstate 20 start and end. The Eastern Terminus of Interstate 20 is in Florence, South Carolina, at the junction of Interstate 95. The Western Terminus of Interstate 20 is near Kent, Texas at Interstate 10. I-20 passes through 6 states in total: â¢ 1  South Carolina (141 miles). â¢ 2  Georgia (202 miles). â¢ 3  Alabama (214 miles). â¢ 4  Mississippi (154 miles).