540
- 54001 Amery
- 54002 Baldwin
- 54003 Beldenville
- 54004 Clayton
- 54005 Clear Lake
- 54006 Cushing
- 54007 Deer Park
- 54009 Dresser
- 54010
- 54011 Ellsworth
- 54013 Glenwood City
- 54014 Hager City
- 54015 Hammond
- 54016 Hudson
- 54017 New Richmond
- 54020 Osceola
- 54021 Prescott
- 54022 River Falls
- 54023 Roberts
- 54024 Saint Croix Falls
- 54025 Somerset
- 54026 Star Prairie
- 54027 Wilson
- 54028 Woodville
- 54082 Houlton