Stockholm County (Swedish: Stockholms Län) is one of the 29 multi-member constituencies of the Riksdag, the national legislature of Sweden.

The constituency currently elects 40 of the 349 members of the Riksdag using the open party-list proportional representation electoral system.

Stockholm County currently elects 40 of the 349 members of the Riksdag using the open party-list proportional representation electoral system.

[4][5] Constituency seats are allocated using the modified Sainte-Laguë method.

[6][7] Only parties that reach the 4% national threshold and parties that receive at least 12% of the vote in the constituency compete for constituency seats.