513
- 51301 Spencer
- 51331 Arnolds Park
- 51333 Dickens
- 51334 Estherville
- 51338 Everly
- 51341 Gillett Grove
- 51342 Graettinger
- 51343 Greenville
- 51345 Harris
- 51346 Hartley
- 51347 Lake Park
- 51350 Melvin
- 51351 Milford
- 51354 Ocheyedan
- 51355 Okoboji
- 51357 Royal
- 51358 Ruthven
- 51360 Spirit Lake
- 51363 Superior
- 51364 Terril
- 51365 Wallingford
- 51366 Webb