There is one place named Hydra in America.
All places in the world called "Hydra".
Riverside (46)
Centerville (43)
Fairview (40)
Midway (39)
Franklin (39)
Union (37)
Greenwood (37)
Marion (36)
Glendale (36)
Salem (36)
Georgetown (35)
Oakland (35)
Liberty (35)
Fairfield (35)
Lincoln (35)
Pleasant Valley (35)
Florence (34)
Arlington (34)
Greenville (34)
Bethel (34)
Springfield (34)
Clinton (34)
Chester (33)
Kingston (33)
Clifton (33)
Milton (33)
Hamilton (33)
Newport (33)
Farmington (33)
Mount Pleasant (32)