There is one place named Hardenburg in Germany.
All places in the world called "Hardenburg".
Neustadt (15)
Marienthal (13)
Neuhof (13)
Neudorf (12)
Burg (12)
Friedrichsthal (11)
Lindenberg (11)
Buchholz (11)
Neuhaus (11)
Bergen (10)
Schönberg (10)
Steinberg (10)
Holzhausen (10)
Aue (10)
Glashütte (10)
Steinfeld (9)
Blumenthal (9)
Winkel (9)
Neukirchen (9)
Altenhof (9)
Lichtenberg (9)
Langenberg (8)
Falkenberg (8)
Limbach (8)
Schönfeld (8)
Steinbach (8)
Rosenthal (8)
Steinfurth (8)
Petersberg (8)
Eichholz (8)