Changes in sub-regional units On 1 January 2017, as Luvia (442) merged with Eurajoki (051), the area of the former municipality of Luvia moved from the sub-regional unit of Pori (043) to the sub-regional unit of Rauma (041). As Juankoski (174) merged with Kuopio (297), the area of the former municipality of Juankoski moved from the sub-regional unit of Koillis-Savo (113) to that of Kuopio (112).
Changes in sub-regional units on 1 January 2016 Vaala moved from the sub-regional unit of Kajaani (182) to the sub-regional unit of Oulunkaari (173).
Changes in sub-regional units on 1 January 2015 Two municipalities, Kuopio (incl. Maaninka) and Siilinjärvi, belong to the sub-regional unit of Kuopio (112) (in 2014 three). Lavia (413) merged with Pori (609) and the area of the former municipality of Lavia moved from the sub-regional unit of Pohjois-Satakunta (044) to that of Pori (043). Tarvasjoki (838) merged with Lieto (423) and the area of the former municipality of Tarvasjoki moved from the sub-regional unit of Loimaa (025) to that of Turku (023).
No changes on 1 January 2014
Changes in sub-regional units on 1 January 2013: Nilsiä (534) merged with the municipality of Kuopio (297) and the area of the former municipality of Nilsiä moved from the sub-regional unit of Koillis-Savo (113) to that of Kuopio (112). Suomenniemi (775) merged with the municipality of Mikkeli (491) and the area of the former municipality of Suomenniemi moved from the sub-regional unit of Lappeenranta (091) to that of Mikkeli (101). Yli-Ii (972) merged with the municipality of Oulu (564) and the area of the former municipality of Yli-Ii moved from the sub-regional unit of Oulunkaari (173) to that of Oulu (171). Kiikoinen (254) merged with the municipality of Sastamala (790) and the area of the former municipality of Kiikoinen moved from the sub-regional unit of Pohjois-Satakunta (044) to that of Lounais-Pirkanmaa (068). Vähäkyrö (942) merged with the municipality of Vaasa (905) and the area of the former municipality of Vähäkyrö moved from the sub-regional unit of Kyrönmaa (151) to that of Vaasa (152). The number of sub-regional units remained unchanged and their number in Mainland Finland is 67.
No changes on 1 January 2012.
Changes in sub-regional units on 1 January 2011: Rantasalmi (681) moved from the sub-regional unit of Pieksämäki (105) to that of Savonlinna (103). Sipoo (753) moved from the sub-regional unit of Porvoo (201) to that of Helsinki (011). As the region of Eastern Uusimaa (20) was merged with that of Uusimaa (01), the number of the sub-regional unit of Porvoo (201) changed into 015 and that of the sub-regional unit of Loviisa (202) changed into 016. Kuhmalahti (289) was merged with Kangasala (211) and the area of the former municipality of Kuhmalahti moved from the sub-regional unit of Kaakkois-Pirkanmaa (062) to that of Tampere (064). Pälkäne (635) moved from the sub-regional unit of Kaakkois-Pirkanmaa (062) to that of Tampere (064). As a result of these two changes, the sub-regional unit of Kaakkois-Pirkanmaa (062) was abolished.
Latest changes (1 January 2010): Himanka (095) was merged with the municipality of Kalajoki (208) and the area of the former municipality of Himanka moved from the sub-regional unit of Kokkola (162) to that of Ylivieska (177). Orivesi (562) moved from the sub-regional unit of Ylä-Pirkanmaa (069) to that of Tampere (064). Hämeenkyrö (108) moved from the sub-regional unit of Luoteis-Pirkanmaa (061) to that of Tampere (064). Juuka (176) moved from the sub-regional unit of Pielisen Karjala (125) to that of Joensuu (122). Heinola (111), Sysmä (781) and Hartola (081) moved from the sub-regional unit of Heinola (072) to that of Lahti (071) whereby the sub-regional unit of Heinola ceases to exist. The name of the sub-regional unit of Siikalatva (175) was changed to Haapavesi-Siikalatva. The sub-regional unit code remained unchanged. The name of sub-regional unit 153 is Sydösterbotten.