Danh sách vùng
- 61101 - Rockford, Winnebago, Illinois
- 61102 - Rockford, Winnebago, Illinois
- 61103 - Rockford, Winnebago, Illinois
- 61104 - Rockford, Winnebago, Illinois
- 61105 - Rockford, Winnebago, Illinois
- 61106 - Rockford, Winnebago, Illinois
- 61107 - Rockford, Winnebago, Illinois
- 61108 - Rockford, Winnebago, Illinois
- 61109 - Rockford, Winnebago, Illinois
- 61110 - Rockford, Winnebago, Illinois
- 61112 - Rockford, Winnebago, Illinois
- 61114 - Rockford, Winnebago, Illinois
- 61125 - Rockford, Winnebago, Illinois
- 61126 - Rockford, Winnebago, Illinois
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