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Rockford County is a county located in the Mushroom Kingdom. It is suggested that the region is located north of Mushroom City. There is a city called Rockford in the area It makes a prominent appearance in SMG4: 🌽🌽🌽🌽𝓒𝓸𝓻𝓷🌽🌽🌽🌽.
The county appears to be rural, with an exception of San Andreas. The reason being the many sunflower fields and farms, including Steve's corn farm. Rockford also has its own fire brigade, which Swagmaster and Chris are employed in.