451
- 45101 Aberdeen
- 45102 Amelia
- 45103 Batavia
- 45106 Bethel
- 45107 Blanchester
- 45111 Camp Dennison
- 45112 Chilo
- 45113 Clarksville
- 45115 Decatur
- 45118 Fayetteville
- 45120 Felicity
- 45121 Georgetown
- 45122 Goshen
- 45123 Greenfield
- 45130 Hamersville
- 45131 Higginsport
- 45132 Highland
- 45133 Hillsboro
- 45135 Leesburg
- 45140 Loveland
- 45142 Lynchburg
- 45144 Manchester
- 45145
- 45146 Martinsville
- 45147 Miamiville
- 45148 Midland
- 45150 Milford
- 45152 Morrow
- 45153 Moscow
- 45154 Mount Orab
- 45155 Mowrystown
- 45156 Neville
- 45157 New Richmond
- 45158 Newtonsville
- 45159 New Vienna
- 45160 Owensville
- 45162 Pleasant Plain
- 45164 Port William
- 45166 Reesville
- 45167 Ripley
- 45168 Russellville
- 45169 Sabina
- 45171 Sardinia
- 45172 Sinking Spring
- 45174 Terrace Park
- 45176 Williamsburg
- 45177 Wilmington