| Code | Name | Region |
|---|---|---|
| DEOKG | Ostseebad Kuhlungsborn | MV |
| DEOSK | Oststeinbek | SH |
| DEOTG | Otigheim | BW |
| DEOEI | Otisheim | BW |
| DE57V | Otjendorf | SH |
| DEZDJ | Ottenbach | BW |
| DESXD | Ottendorf | BY |
| DEOND | Ottendorf Bei Stadtroda | TH |
| DEOOK | Ottendorf-okrilla | SN |
| DEOHI | Ottenheim | BW |
| DE77Q | Ottenhofen Im Schwarzwald | BW |
| DEOOO | Ottensoos | BY |
| DENOI | Ottenstein | NI |
| DETBT | Otterbach | RP |
| DEZDK | Otterberg | RP |
| DEOST | Osterburken | BW |
| DEOCP | Ostercappeln | NI |
| DEOID | Ostereistedt | NI |
| DESXO | Osterfeld | ST |
| DEOSH | Osterhausen | ST |
| DEOHN | Osterhofen | BY |
| DEOSS | Osterholz-scharmbeck | NI |
| DE63H | Osterhorn | SH |
| DEOSR | Ostermoor | SH |
| DEOSX | Osternienburg | ST |
| DEOSE | Osterode Am Harz | NI |
| DETRD | Osterronfeld | SH |
| DETY6 | Osterspai | RP |
| DETER | Osterwald | NI |
| DEOWD | Osterweddingen | ST |
| DEOWF | Osterwieck | ST |
| DEOSF | Ostfildern | BW |
| DE76H | Ostgrossefehn | NI |
| DEORR | Ostheim Vor Der Rhon | BY |
| DEOHH | Osthofen | RP |
| DEORB | Ortenberg | HE |
| DEOCE | Ortenburg | BY |
| DEORT | Orth/fehmarn | SH |
| DEOTD | Ortrand | BB |
| DEONM | Osann-monzel | RP |
| DEOUR | Osburg | RP |
| DEOTZ | Oschatz | SN |
| DEOSC | Oschatzchen | BB |
| DEOLN | Oschersleben | ST |
| DE68W | Osdorf | SH |
| DEOAS | Oslebshausen | HB |
| DEOSL | Osloss | NI |
| DEOSN | Osnabruck | NI |
| DEOSB | Ossenberg | NW |
| DEOTV | Ostbevern | NW |