| Ober-Flörsheim | RP B271 |
| Ober-Mörlen | HE A5 B275 |
| Ober-Ramstadt | HE B426 B449 |
| Oberahr | RP B255 |
| Oberammergau | BY B23 |
| Oberau | BY B2 B23 |
| Oberaudorf | BY A93 |
| Oberaula | HE B454 |
| Oberbillig | RP B419 |
| Oberbrombach | RP B41 |
| Oberdachstetten | BY B13 |
| Oberderdingen | BW B293 |
| Oberdiebach | RP B9 |
| Oberdischingen | BW B311 |
| Oberehe-Stroheich | RP B421 |
| Oberelchingen | BY A8 |
| Obererlbach | BY B466 |
| Oberfell | RP B49 |
| Oberfischbach | RP B274 |
| Obergeis | HE B324 |
| Oberhaching | BY A995 |
| Oberhambach | RP B269 |
| Oberhausen | NW A2 A3 A40 A42 A516 B223 |
| Oberhausen (Weilheim-Schongau) | BY B472 |
| Oberhof | TH A71 |
| Oberhonnefeld-Gierend | RP B256 |
| Oberickelsheim | BY B13 |
| Oberjoch | BY B308 |
| Oberkirch | BW B28 |
| Oberkochen | BW B19 |
| Oberkrämer | BB A10 |
| Oberleichtersbach | BY B27 |
| Oberlungwitz | SN B173 |
| Obermarchtal | BW B311 |
| Obermoschel | RP B420 |
| Obernau | RP B256 |
| Obernburg am Main | BY B426 B469 |
| Oberndorf | RP B48 |
| Oberndorf am Neckar | BW A81 B14 |
| Obernfeld | NI B247 |
| Obernhof | RP B417 |
| Obernkirchen | NI B65 |
| Obernzell | BY B388 |
| Oberölsbach | BY A3 |
| Oberotterbach | RP B38 |
| Oberottmarshausen | BY B17 |
| Oberpfaffenhofen | BY A96 |
| Oberraden | RP B256 |
| Oberreichenbach | BW B296 |
| Oberreidenbach | RP B270 |
| Oberreute | BY B308 |
| Obersalzberg | BY B319 |
| Oberschleißheim | BY A92 B13 B471 |
| Oberschneiding | BY B20 |
| Oberschöna | SN B173 |
| Oberschwarzach | BY B22 |
| Obersöchering | BY B472 |
| Oberstadtfeld | RP B257 |
| Oberstaufen | BY B308 |
| Oberstdorf | BY B19 |
| Obersulm | BW B39 |
| Oberteuringen | BW B33 |
| Oberthulba | BY A7 |
| Obertiefenbach | RP B260 |
| Obertraubling | BY B15 |
| Obertshausen | HE A3 B45 B448 |
| Oberursel (Taunus) | HE A661 B455 B456 |
| Oberviechtach | BY B22 |
| Oberweiler-Tiefenbach | RP B270 |
| Oberweis | RP B50 |
| Oberwesel | RP B9 |
| Oberwiesenthal | SN B95 |
| Oberzent | HE B45 |
| Obing | BY B304 |
| Obrigheim | BW B292 |
| Obrigheim (Pfalz) | RP B271 |
| Ochsenfurt | BY B13 |
| Ochsenhausen | BW B312 |
| Ochtendung | RP A48 |
| Ochtrup | NW A31 B54 B403 |
| Odelzhausen | BY A8 |
| Odenbach | RP B420 |
| Oderberg | BB B158 |
| Oderwitz | SN B96 |
| Oebisfelde | ST B188 |
| Oederan | SN B173 |
| Oelde | NW A2 |
| Oelsberg | RP B274 |
| Oelshausen | HE B251 |
| Oelsnitz/Vogtl. | SN B92 |
| Oer-Erkenschwick | NW B235 |
| Oerel | NI B71 |
| Oerlenbach | BY A71 B286 |
| Oesterdeichstrich | SH B203 |
| Oestrich-Winkel | HE B42 |
| Oettingen in Bayern | BY B466 |
| Offenau | BW B27 |
| Offenbach am Main | HE A3 A661 B3 B43 B448 |
| Offenbach-Hundheim | RP B420 |
| Offenburg | BW A5 B3 B33 B33a |
| Offenthal | HE B486 |
| Ofterdingen | BW B27 |
| Oftersheim | BW B535 |
| Ohlstadt | BY B2 |
| Ohorn | SN A4 |
| Ohrdruf | TH B88 B247 |
| Olbernhau | SN B171 |
| Olbersleben | TH B85 |
| Olching | BY B471 |
| Oldenburg | NI A28 A29 A293 B401 |
| Oldenburg in Holstein | SH A1 B202 |
| Oldenswort | SH B5 |
| Oldisleben | TH B85 B86 |
| Olfen | NW B235 B236 B474 |
| Olpe | NW A4 A45 B54 B55 |
| Olsberg | NW B480 |
| Olsbrücken | RP B270 |
| Olzheim | RP B51 |
| Opfenbach | BY B32 |
| Oppach | SN B96 B98 |
| Oppenau | BW B28 |
| Oppenheim | RP B9 |
| Oppenweiler | BW B14 |
| Oppurg | TH B281 |
| Oranienbaum-Wörlitz | ST B107 |
| Oranienburg | BB A10 A111 B96 B273 |
| Orlenbach | RP B51 |
| Orscholz | SL |
| Orsfeld | RP B257 |
| Orsingen-Nenzingen | BW B31 |
| Ortenberg | HE B275 B457 |
| Ortrand | BB A13 |
| Oschatz | SN B6 |
| Oschersleben (Bode) | ST B246 |
| Osloß | NI B188 |
| Osnabrück | NI A1 A30 A33 B51 B65 B68 |
| Ostbevern | NW B51 |
| Osten | NI B495 |
| Oster-Ohrstedt | SH B201 |
| Osterburg (Altmark) | ST B189 |
| Osterburken | BW A81 B292 |
| Ostercappeln | NI B51 B65 B218 |
| Osterhofen | BY B8 |
| Osterholz-Scharmbeck | NI B74 |
| Osterode am Harz | NI B241 B243 B498 |
| Osterspai | RP B42 |
| Ostfildern | BW B10 |
| Ostheim vor der Rhön | BY B285 |
| Osthofen | RP B9 |
| Ostramondra | TH B176 |
| Ostrau | SN B169 |
| Ostrhauderfehn | NI B438 |
| Ostritz | SN B99 |
| Ottendorf-Okrilla | SN A4 B97 |
| Ottensoos | BY B14 |
| Otterbach | RP B270 |
| Otterfing | BY B13 |
| Otterndorf | NI B73 |
| Ottersweier | BW B3 |
| Ottobeuren | BY |
| Ottobrunn | BY A99 B471 |
| Ottweiler | SL B41 B420 |
| Otzberg | HE B426 |
| Otzenhausen | SL A1 |
| Ovelgünne | ST B246a |
| Overath | NW A4 B55 B484 |
| Owen | BW B465 |
| Owschlag | SH A7 |
| Oy-Mittelberg | BY A7 B309 B310 |
| Oyten | NI A1 |
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