Center of Roscoff from Sainte Barbe chapel
|o Mayor (2020–2026)||Odile Thubert Montagne|
|6.19 km2 (2.39 sq mi)|
|o Density||560/km2 (1,400/sq mi)|
|Time zone||UTC+01:00 (CET)|
|o Summer (DST)||UTC+02:00 (CEST)|
|Elevation||0-58 m (0-190 ft) |
(avg. 6 m or 20 ft)
|1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.|
Roscoff is renowned for its picturesque architecture, labelled petite cité de caractère de Bretagne (small town of character) since 2009. Roscoff is also a traditional departure point for Onion Johnnies.
After lobbying by local economic leaders headed by Alexis Gourvennec, the French government agreed in 1968 to provide a deep-water port at Roscoff. Existing ferry operators were reluctant to take on the relatively long Plymouth/Roscoff crossing, so Gourvennec and colleagues founded Brittany Ferries. Since the early 1970s, Roscoff has been developed as a ferry port for the transport of Breton agricultural produce, and for motor tourism. Brittany Ferries and Irish Ferries link Roscoff with both Ireland and the United Kingdom.
Due to the richness of iodine in the surrounding waters and the mild climate maintained by a sea current that only varies between 8 and 18 °C (46 and 64 °F), Roscoff is also a centre of post-cure which gave rise to the concept of thalassotherapy in the latter half of the 19th century. A French doctor, Louis-Eugène Bagot, opened the Institut marin in Roscoff in 1899, the first centre for thalassotherapy in Europe. Since then many important centres of thalassotherapy such as the Institut de Rockroum (originally Institut marin), the clinic Kerléna, and a heliomarin hospital founded in 1900, the Perharidy Centre, can be found on the edges of the sea at Roscoff.
Inhabitants of Roscoff are called in French Roscovites.
The municipality launched a linguistic plan through Ya d'ar brezhoneg on 14 November 2008.
In 2008, 18.44% of primary-school children attended bilingual schools.
Brittany Ferries operate ferry services from Roscoff to Plymouth daily from February to November with occasional Christmas sailings, to Cork twice a week (Friday and Tuesday service) from March to November and to Rosslare Europort once a week (Tuesdays) from May to October.
Roscoff is twinned with:
Roscoff from the pier 
The Renaissance spire (1576) of Roscoff parish church Our Lady of Croaz Batz
Alexandre Dumas's house during the summer 1869.