Grenada is 4,586,667 times larger than Jackson, Mississippi.
Area: 344 km2 World Factbook
Population: 110,152 (July 2014) World Factbook
Grenada is an island country consisting of the island of Grenada and six smaller islands at the southern end of the Grenadines in the southeastern Caribbean Sea. Grenada is located northwest of Trinidad and Tobago, northeast of Venezuela, and southwest of Saint Vincent and the Grenadines. Wikipedia
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