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What Exactly Is 39529?

It's the zip code designation for a unique federal city that serves the nation in ways many people do not realize. NASA's John C. Stennis Space Center – located at the 39529 zip code address – is the nation's largest rocket engine test facility. Home to more than 5,000 federal, military and private company employees, Stennis Space Center truly is a city unto itself, complete with a post office, bank, credit union, daycare center, fitness center, convenience store, fuel station and more. And, as it has done since its establishment 50 years ago this October, Stennis Space Center tests the rocket engines that power America’s space exploration dreams.