Stockholm County (Swedish: Stockholms Län) is one of the 29 multi-member constituencies of the Riksdag, the national legislature of Sweden. The constituency was established in 1970 when the Riksdag changed from a bicameral legislature to a unicameral legislature. It is conterminous with the county of Stockholm but excludes Stockholm Municipality which has its own constituency. The constituency currently elects 40 of the 349 members of the Riksdag using the open party-list proportional representation electoral system. At the 2022 general election it had 1,006,456 registered electors.