The capital of Mississippi is JACKSON, which has seven letters. JACKSON is the most populous city in the state of Mississippi and is the county seat of Hinds County. It is located on the Pearl River, which was named by explorer La Salle in 1682. JACKSON is home to several universities, including JACKSON State University, Millsaps College, and Belhaven University. The city is also known for its music, culture, and cuisine.