Spring City was a city in Maryland.
After Ro ran away from her foster parents in Hillsburg, Oregon, she eventually made it to Spring City. She was placed in a foster home there, but her personality clashed with that of the other girls. She ran away, and was pressed into Slam's gang.
Ro met the synthoid Zeta on the corner of 8th and Merrill. He intervened as Slam was about to kill her for stepping out of his gang. This was spotted by NSA agents, who pursued the fugitive robot. After losing the feds, Zeta and Ro left Spring City.