421
- 42101 Bowling Green
- 42102
- 42103 Bowling Green
- 42104 Bowling Green
- 42120 Adolphus
- 42122 Alvaton
- 42123 Austin
- 42124 Beaumont
- 42127 Cave City
- 42129 Edmonton
- 42130 Eighty Eight
- 42133 Fountain Run
- 42134 Franklin
- 42140 Gamaliel
- 42141 Glasgow
- 42151 Hestand
- 42153 Holland
- 42154 Knob Lick
- 42156 Lucas
- 42157 Mount Hermon
- 42159 Oakland
- 42160 Park City
- 42163 Rocky Hill
- 42164 Scottsville
- 42166 Summer Shade
- 42167 Tompkinsville
- 42170 Woodburn
- 42171 Smiths Grove