The HUH Hospital Area includes the municipalities of Espoo, Helsinki, Kauniainen, Kerava, Kirkkonummi and Vantaa. The hospitals in these municipalities are: Aurora Hospital, Herttoniemi Hospital, the Skin and Allergy Hospital, Jorvi Hospital, Surgical Hospital, the New Children’s Hospital, Children’s Castle, Meilahti Triangle Hospital, Meilahti Tower Hospital, the Women's Hospital, Peijas Hospital, HUH Psychiatry Centre, the Eye and Eye and Ear Hospital, the Comprehensive Cancer Centre and Töölö Hospital.
The Hyvinkää Hospital Area includes Hyvinkää, Järvenpää, Mäntsälä, Nurmijärvi and Tuusula. Hyvinkää and Kellokoski hospitals are local hospitals.
The Lohja Hospital Area includes Karkkila, Lohja, Siuntio and Vihti. The area is served by Lohja Hospital.
The Länsi-Uusimaa Hospital Area includes Hanko, Raasepori and Inkoo. The area is served by Raasepori Hospital. As of 1 January 2018, Raasepori Hospital is a HUH profit centre.
The Porvoo Hospital Area includes Askola, Lapinjärvi, Loviisa, Pornainen, Porvoo and Sipoo. The area is served by Porvoo Hospital.
The HUH catchment area for highly specialised medical care serves currently more than 2 million people in 51 municipalities. In addition to HUS, the HUH catchment area for highly specialised care includes the South Karelia, Kymenlaakso and Päijät-Häme hospital districts. Since 2018, the HUH catchment area for highly specialised medical care has covered 39% of the population in Finland.