Capital Region

In the strictest sense, the Finnish capital region consists of four municipalities with city title, Helsinki, Vantaa, Espoo and Kauniainen. It has a population of about 1.25 million. This area is most often called the Capital region in English, Pääkaupunkiseutu in Finnish, and Huvudstadsregionen in Swedish, although the use of the terms is not especially consistent. The vast majority of the inhabitants live in the urban areas of the cities, but within the boundaries of these cities there are also suburban and rural areas.

Helsinki metropolitan area

The Helsinki metropolitan area includes around ten additional municipalities that can be considered commuter towns and exurbs of Helsinki. These municipalities are Hyvinkää, Järvenpää, Kerava, Kirkkonummi, Nurmijärvi, Sipoo, Tuusula, Mäntsälä, Pornainen and Vihti, bringing the total population to about 1.58 million. All of the municipalities belong to the region of Uusimaa. Of these, Järvenpää, Kerava, Tuusula, Nurmijärvi, Sipoo, Kirkkonummi, Mäntsälä and Vihti have parts of the urban area within them. Additionally, the cities of Porvoo, Lohja, Karkkila and to some extent Riihimäki, which have very close ties, motorway and, in the case of Riihimäki, commuter train accesses, and are fairly close to the capital, are nowadays often included in regional planning, which raises the total population to about 1.72 million.

Helsinki sub-region

Helsinki metropolitan area differs from the Helsinki sub-region (Finnish: Helsingin seutukunta), which also includes the municipalities of Karkkila, Lohja and Siuntio. The Helsinki sub-region is used for statistical purposes. It is based on cooperation between municipalities and the commuting area. The sub-region has a population of about 1.64 million.

Helsinki Region Cooperation Assembly

The Helsinki Region Cooperation Assembly is a cooperative body of the municipalities of the Helsinki Region, whose members are the leading elected representatives of the municipalities. Seventeen municipalities participate in cooperation in the Helsinki Region:^[9]

• Cities in the Helsinki Capital Area:^{[note 2]} Helsinki, Espoo, Vantaa and Kauniainen.
• The so-called KUUMA municipalities: Järvenpää, Nurmijärvi, Tuusula, Kerava, Mäntsälä, Pornainen, Hyvinkää, Kirkkonummi, Vihti and Sipoo.
• Partnership municipalities: Porvoo, Lohja and Siuntio.

The common goal of the participating municipalities is to develop cooperation and advocacy. The cooperation is based on the common vision of the municipalities in the Helsinki region regarding the challenges facing the region and the common will to contribute to the development of the region.^[9]

Other definitions

As a part of the "Urban audit" project, Eurostat has attempted to standardise the concept of a 'metropolitan area'. According to this study the Metropolitan area of Helsinki consists of the kernel of Helsinki: Helsinki, Espoo, Vantaa, and Kauniainen. The Helsinki Larger Urban Area (Helsingin seutu in Finnish) consists of 12 cities and municipalities: the kernel of Helsinki and the aforementioned eight municipalities.^[10]

Statistics Finland define the commuter belt of Helsinki (Helsingin työssäkäyntialue, Helsingfors pendlingsområde) to include a total of 27 municipalities and a population of 1.77 million.^[11][12] In addition to that, there are people from as far as Lahti and even Tampere commuting to Helsinki daily.

Statistics Finland also defines the Helsinki urban area according to the official Finnish definion of an urban area (taajama in Finnish). Urban areas in Finland are defined as inhabited areas of at least 200 people with a maximum distance of 200 metres (660 ft) between buildings.^[13][14] The Helsinki urban area is the largest of its kind in Finland, and encompasses land throughout metropolitan area, with notable gaps around forests and other less-densely populated areas.

The commuter towns of Lohja and Porvoo are not usually included to the Helsinki metropolitan area, though, if they were (considering their proximity to Helsinki and their high commuting rate), they would raise the overall population almost two million people. Hyvinkää, Järvenpää, Nurmijärvi, Tuusula, Mäntsälä and Pornainen, which have been designated as municipalities in Central Uusimaa in recent decades, have shown clear population growth due to their urban but also loose rural environment. These are also known as "Kuuma-kunnat" (literally means "hot municipalities").^[15]