There is a total of 9962 clues beginning with ci
- City on the Ohio
- City on the Oka
- City on the Oka River
- City on the Oka River
- City on the Oka, near Moscow
- City on the Oka
- City on the Om
- City on the Oregon Trail
- City on the Orne
- City on the Orne River
- City on the Orne
- City on the Ouse
- City on the Ouse
- City on the Outer Cape of Massachusetts
- City on the Overland Trail
- City on the Pacific
- City on the Panama Canal
- City on the Pará
- City on the Pará
- City on the Passaic
- City on the Patapsco
- City on the Pau
- City on the Penobscot
- City on the Penobscot River
- City on the Penobscot
- City on the Permian Basin
- City on the Philistia plain
- City on the Pina
- City on the Plata
- City on the Platte
- City on the Po
- City on the Po river
- City on the Po River
- City on the Po, near Palma
- City on the Po
- City on the Po: It
- City on the Potomac
- City on the Potomac
- City on the Puget Sound
- City on the Puyallup River
- City on the Raccoon
- City on the Red River
- City on the Red River of Indo-China
- City on the Red River
- City on the Reuss
- City on the Reuss River
- City on the Rhein
- City on the Rhein
- City on the Rhine
- City on the Rhine River
- City on the Rhine, old style
- City on the Rhine, to locals
- City on the Rhine
- City on the Rhine: Ger
- City on the Rhone
- City on the Rhône and Saône
- City on the Rhone delta
- City on the Rhone delta
- City on the Rhone River
- City on the Rhone River delta
- City on the Rhone River, France
- City on the Rhone
- City on the Rideau Canal
- City on the Rimac
- City on the Rímac River
- City on the Rio Grande
- City on the Rio Grande
- City on the River Scheldt
- City on the Riviera
- City on the Riviera
- City on the road to Rangoon
- City on the Roaring Fork River
- City on the Ruhr
- City on the Ruhr River
- City on the Ruhr
- City on the Saale
- City on the Saale River
- City on the Saale
- City on the Sabine
- City on the Saguenay
- City on the Sahara Desert
- City on the Salentine Peninsula
- City on the Salt
- City on the Salt River
- City on the Salt River
- City on the Sangamon
- City on the Santa Cruz
- City on the Saone
- City on the Saône and Rhone
- City on the Sarthe
- City on the Sarthe
- City on the Savannah River
- City on the Scarpe River
- City on the Schelde
- City on the Scheldt
- City on the Scheldt
- City on the Schuykill River
- City on the Schuylkill
- City on the Seine
- City on the Seine upstream from Paris