St. Tammany Parish, Louisiana is 38,460,994 times larger than Jackson, Mississippi.
Area: 0 km2 calculated
Jackson is the capital and since 1944 the largest city of the U.S. state of Mississippi. Located south of the Yazoo River, it is considered to be at the southern border of the Mississippi Delta and is one of two county seats of Hinds County, with the city of Raymond being the other. Wikipedia
Area: 2,885 km2 calculated
St. Tammany Parish is a parish located in the U.S. state of Louisiana. As of the 2010 census. The parish seat is Covington. St. Tammany Parish is one of the fastest-growing parishes in the state, along with Livingston and Ascension. Most new residents are thought to have come from St. Wikipedia