Online Directory: Maryland, USA
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Communities designated in blue are Members of Sister Cities International. Click on a city name to learn more about its sister city initiatives.
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| Community | Website | Sister City | Website | |
| Annapolis |  | Newport, Wales, UK | ||
| Annapolis | | Dumfries, Scotland, UK | ||
| Annapolis | | Wexford, Wexford, Ireland | ||
| Annapolis | | Tallinn, Harjumaa (Tallinn), Estonia | ||
| Baltimore | | Gbarnga, Liberia | ||
| Baltimore | | Genoa, Liguria, Italy | ||
| Baltimore | | Ely O'Carroll, Ireland | ||
| Baltimore | | Kawasaki, Japan | ||
| Baltimore | | Luxor, Egypt | ||
| Baltimore | | Odessa, Odes'ka (Odesa), Ukraine | ||
| Baltimore | | Piraeus, Attiki, Greece | ||
| Baltimore | | Rotterdam, Zuid-Holland, Netherlands | ||
| Baltimore | | Xiamen, China | ||
| Baltimore | | Alexandria, Egypt | | |
| Baltimore | | Ashkelon, Southern, Israel | ||
| Calvert County | Filey, England, UK | |||
| Charles County | | Jogeva County, Jogevamaa (Jogeva), Estonia | ||
| Charles County | | Walldorf, Germany | ||
| Columbia | | Cergy-Pontoise, Ile-de-France, France | ||
| Columbia | | Tres Cantos, Madrid, Spain | ||
| District Heights | ||||
| Frederick | | Moerzheim, Rheinland-Pfalz, Germany | ||
| Frederick | | Schifferstadt, Rheinland-Pfalz, Germany | ||
| Frederick | | Aquiraz, Brazil | ||
| Garrett County | | Valga, Valgamaa (Valga), Estonia | ||
| Garrett County | | Otepää, Valgamaa (Valga), Estonia | ||
| Garrett County | | Torva, Valgamaa (Valga), Estonia | ||
| Ocean City | Finale Ligure, Liguria, Italy | |||
| Prince George's County | Royal Bafokeng Nation, South Africa | |||
| Prince George's County | Rishon Le Zion, Israel | |||
| Prince George's County | Ziguinchor, Ziguinchor, Senegal | |||
| Queen Anne's County | Suzhou, Jiangsu, China | |||
| Rockville | | Pinneberg, Schleswig-Holstein, Germany | ||
| Salisbury | | Salisbury, England, UK | ||
| Salisbury | | Tartu, Tartumaa (Tartu), Estonia | ||
| State of Maryland | | Anhui Province, Anhui, China | ||
| State of Maryland | | Jalisco, Jalisco, Mexico | ||
| State of Maryland | | Maryland County, Maryland, Liberia | ||
| State of Maryland | | Kanagawa, Kanagawa, Japan | ||
| State of Maryland | | Gyeongsangnam, Gyeongsangnam, South Korea | ||
| State of Maryland | | Lodz Region, Lodzkie, Poland | ||
| State of Maryland | | Rio de Janeiro, (State of), Rio de Janeiro, Brazil | ||
| State of Maryland | | Wallonia (Région of), Antwerpen, Belgium | ||
| State of Maryland | | Nord-Pas de Calais, Nord-Pas-de-Calais, France | ||
| State of Maryland | | St. Petersburg, Leningradskaya, Russia | | |
| State of Maryland | | Bong County, Bong, Liberia | ||
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