| OA | Oberallgäu in Sonthofen | | OAL | Ostallgäu in Marktoberdorf | | OB | Oberhausen | | OD | Stormarn in Bad Oldesloe | | OE | Olpe | | OF | Offenbach | | OG | Offenburg | | OH | Ostholstein | | OHA | Osterode | | OHV | Oberhavel | | OHZ | Osterholz-Scharmbeck | | OK | Ohre-Kreis | | OL | Oldenburg | | OPR | Ostprignitz-Ruppin | | OS | Osnabrück | | OSL | Oberspreewald-Lausitz | | OVL | Obervogtland | | OVP | Ostvorpommern |
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