Bug City is the place where Flik travels to find warrior bugs in order to protect Ant Island from Hopper and his gang. This city is actually littered things under a trailer. Here, Flik finds a group of recently-fired circus bugs and mistakes them as warriors, due to their classic "Robin Hood" act. When P.T. Flea arrives in Ant Island look for his missing troupe and blows Flik's cover, Princess Atta banishes Flik and the troupe to Bug City, however this was a fatal mistake to Princess Atta; she puts herself and the entire colony in danger.
In the city, there are buildings made of boxes and cans, sidewalks made of cardboard, and streetlights made of Christmas lights and lightning bugs. While there, Flik encounters granddaddy longlegs, snails, beetles, flies, mosquitoes, slugs, the troupe, and more.
- There is a box that has a picture of The Lion King Musical on it.
- Bug City is a parody of New York City, but also resembles San Francisco and Chicago in certain aspects.
- The trailer and Pizza Planet truck that this city is located underneath also appears in Monsters, Inc., where Randall Boggs was banished to the human world and beaten up by the Trailer Son and Mom.