IV District, Turku

The IV District, also known as Martti (Finnish; "Martins" in Swedish), is one of the central districts of Turku, Finland. It is located on the east side of the river Aura, between "Tervahovinkatu" in the west and "Betaniankatu" and "Martinkatu" in the east. The district is one of the smallest in Turku, and is centred on the Martinkirkko church, named after the reformer Martin Luther ("Martti Luther" in Finnish). Martti is also one of the most expensive areas to live in Turku.
The district is rather densely populated, and has a population of 4,357 () and an annual population growth rate of -0.46%. 7.16% of the district's population are under 15 years old, while 18.80% are over 65. The district's linguistic makeup is 90.22% Finnish, 8.40% Swedish, and 1.38% other.