Mariehamn’s population grew steadily from under 10,000 in the late 1980s to over 11,800 by 2024. Based on data from Ålands statistik- och utredningsbyrå (ÅSUB),[14] the city’s population by year was:
Mariehamn lies on a peninsula with two main harbours, west and east. Both remain ice-free for most of the year and experience minimal tidal variation.[17]
TheWestern Harbour is an international port with daily ferry connections toSweden,Estonia, and mainlandFinland. Because Åland is outside theEU customs zone, ferries call at Mariehamn to enable duty-free sales.
Mariehamn is the centre of Åland’s media. Both local newspapers,Ålandstidningen andNya Åland, several radio stations, and the television channelsTV Åland andÅland24 operate from the city.[17]
The first public libraries on Åland opened before 1920, and a printing house was founded in 1891. The municipal library, completed in 1989, is known for its modern architecture.
Several buildings in Mariehamn were designed by Finnish architectLars Sonck, including the church of Mariehamn (1927), the main building of theÅland Maritime College (1927), and the town hall (1939).Hilda Hongell also designed wooden houses, though few remain.
The main parish church of Mariehamn is theChurch of St George, opened in 1927, expanded in 1959, and renovated in 1972. The interior features painted wooden ceiling panels by Finnish artist Bruno Tuukkanen and golden mosaics behind the altar illustrating the life of Christ. Decorative items include a ship model,Tjerimaj, and a 37-stop organ built in stages between 1969 and 1982.[19]
^Derby, W. L. A. (21 July 1937)."Mariehamn's Grain Fleet".Shipping Wonders of the World. Amalgamated Press:746–749. Archived fromthe original on 2024-01-05. Retrieved2024-12-27.
^"The Church of St Goran (St George)". Mariehamns Tryckeri Ab. 2011.{{cite web}}:Missing or empty|url= (help)
^ab"Suomen maakuntien ilmasto" [The climate of Finland’s regions](PDF) (in Finnish). Finnish Meteorological Institute. 2009. Retrieved14 October 2025.
^ab"Tilastoja Suomen ilmastosta 1991–2020" [Climatological statistics of Finland 1991–2020](PDF) (in Finnish). Finnish Meteorological Institute. 2021. Retrieved14 October 2025.