| Code | Name | Region |
|---|---|---|
| DEORM | Ober-morlen | HE |
| DERPO | Obermoschel | RP |
| DEOBG | Obernburg Am Main | BY |
| DEYBE | Oberndorf | BY |
| DEOAL | Oberndorf Am Lech | BY |
| DEODF | Oberndorf Am Neckar | BW |
| DEOZB | Oberneisen | RP |
| DEOHK | Obernheim | BW |
| DEOBK | Obernkirchen | NI |
| DEZLL | Obernzell | BY |
| DEOB9 | Oberofflingen | RP |
| DEOLM | Ober-olm | RP |
| DEOPF | Oberopfingen | BW |
| DE45T | Oberotterbach | RP |
| DEOT3 | Oberottmarshausen | BY |
| DEOHS | Oberhausen | BY |
| DEOBE | Oberhausen | NW |
| DEOAN | Oberhausen An Der Nahe | RP |
| DEORN | Oberhausen-rheinhausen | BW |
| DEOIH | Oberheimbach | RP |
| DEOH5 | Ober-hilbersheim | RP |
| DEOHO | Oberhochstadt | RP |
| DEONH | Oberhonnefeld-gierend | RP |
| DE79D | Oberjettingen | BW |
| DEOJO | Oberjoch | BY |
| DEOKH | Oberkirch | BW |
| DEOKL | Oberkleen | HE |
| DEOKO | Oberkochen | BW |
| DEOKY | Oberkotzau | BY |
| DEOKM | Oberkramer | BB |
| DEOLR | Oberlahr | RP |
| DEOAR | Oberland Am Rennsteig | TH |
| DEODB | Oberleichtersbach | BY |
| DEOLA | Oberlichtenau | SN |
| DEORZ | Oberlungwitz | SN |
| DEOBY | Obercrinitz | SN |
| DEOBD | Oberdachstetten | BY |
| DEODN | Oberderdingen | BW |
| DEODD | Oberding | BY |
| DEODC | Oberdischingen | BW |
| DEBYO | Oberdolling | BY |
| DEOOA | Oberdorla | TH |
| DEOB7 | Oberdreis | RP |
| DEOEX | Obereiderhafen | SH |
| DEOB5 | Oberelsbach | BY |
| DEOOB | Oberessendorf | BW |
| DEBFV | Oberferrieden | BY |
| DECFO | Ober-florsheim | RP |
| DEOT2 | Obergebra | TH |
| DEOUG | Obergunzburg | BY |