|Province||Principality of Esmeralda|
|Leader||Duke of Seko|
|Imperial Senate||3 Seats|
Seko City is a city-state of the Esmeraldan Empire located in what was once Southern Mexico. The city is part of the Principality of Esmeralda. It was originally established by citizens of Esmeralda Prime as a colony.
The city is subterranean and built four kilometers below the Earth's surface, just above the Earth's mantle, and exists entirely underground. The headquarters for the Surgeon General's Office of the Imperial Legion are located in Seko City.
The city was founded by House Seko in 4790.