List of states:

[AL] Alabama
[AK] Alaska
[AZ] Arizona
[FL] Florida
[GA] Georgia
[HI] Hawaii
[ID] Idaho
[IN] Indiana
[IA] Iowa
[KS] Kansas
[ME] Maine
[MT] Montana
[NV] Nevada
[OH] Ohio
[OR] Oregon
[TX] Texas
[UT] Utah
[VT] Vermont
[WY] Wyoming

List of cities in South Dakota:

Agar, SD 57520
Avon, SD 57315
Bath, SD 57427
Eden, SD 57232
Egan, SD 57024
Gary, SD 57237
Iona, SD 57542
Java, SD 57452
Kyle, SD 57752
Lane, SD 57358
Lily, SD 57274
Mina, SD 57462
Nemo, SD 57759
Opal, SD 57765
Oral, SD 57766
Reva, SD 57651
Tea, SD 57064
Vale, SD 57788
Wall, SD 57790
Ward, SD 57074
Wood, SD 57585
Yale, SD 57386