The commune of Saint-Pierre is made up of the island of Saint-Pierre proper and several nearby smaller islands, such as L'Île-aux-Marins. Although containing nearly 90% of the inhabitants of Saint Pierre and Miquelon, the commune of Saint-Pierre is considerably smaller than the commune of Miquelon-Langlade, which lies to its northwest on Miquelon Island.
The main settlement and communal seat is situated on the north side of a harbour called Barachois, which faces the Atlantic Ocean, on the Saint-Pierre Island's east coast. The mouth of the harbour is guarded by a small chain of islands.
Until 1945, there existed a third commune in Saint Pierre and Miquelon: L'Île-aux-Marins. The commune of L'Île-aux-Marins was annexed by the commune of Saint-Pierre in 1945.
The population of Saint-Pierre at the 2006 local census was 5,888, many of whom are of Basque, Breton, Normand or Acadian descent. All inhabitants in the commune (municipality) live on the island of Saint-Pierre proper.
The commune is led by a mayor and a council.
Close to the centre of the harbour's edge lie the Post office and Custom House (staffed by Directorate-General of Customs and Indirect Taxes), behind which is General Charles de Gaulle Square, the town's centre.
Other prominent landmarks in Saint-Pierre include the cathedral, to the north of the square, rebuilt in the early twentieth century after a major fire, and the Pointe aux Canons Lighthouse, at the mouth of the harbour. Further north, close to the town's former hospital, is the Fronton Zazpiak Bat - an arena for the traditional Basque sport of pelota.
Hospitalier François Dunan (opened 2011) is the only hospital (84 bed facility) in St. Pierre et Miquelon with additional health care needs at the seniors residence at Maison de Retraite Egalntine.
Saint-Pierre Airport, the international airport of Saint-Pierre and Miquelon, is located south of the settlement of Saint-Pierre and is served by Air Saint-Pierre with flights both to Miquelon Airport and five Canadian airports.
Public primary schools in the commune:
Lycée-Collège d'État Émile Letournel is the public secondary school in the commune, with junior high, vocational high, and general senior high/sixth-form programmes.
Saint-Pierre is twinned with: