What is the southernmost capital city in the continental united states?

Austin, Texas

Explanation:

It is the southernmost capacity city of the continental united states and its located at 30°16'2" N, and is the fastest-growing city of the unites states and has a population of about 964,254 people and has numerous lakes and waterways. The city was formed on December 27, 1839, and the city is about 146 miles long and is located northwest of Huston and south of Dallas.