Place
- Oldenburg, Saxony1
- Orel, Russia1
- Orfeva, on the Danube, Europe1
- Orsova, on the Danube, Romania1
- Ortelsburg, Prussia1
- Ostend, Flanders1
- Oudenarde, East Flanders1
- Paderborn, Germany1
- Parchim, Mecklenburg-Schwerin1
- Pattensen, Hanover1
- Peitz, Brandenburg1
- Pennsylvania, U.S.A.1
- Philadelphia, Pennsylvania1
- Piacenza, Italy1
- Pillau, Prussia1
- Pilnikau, Bohemia1
- Pilsen, Bohemia1
- Pisek, Bohemia1
- Pittsburgh, Pennsylvania1
- Pless, Silesia1