1 (Polish: Okręg wyborczy nr 1) in 1991 following the re-organisation of constituencies across Poland.

Electors living abroad or working aboard ships and oil rigs are included in this constituency.

The constituency currently elects 20 of the 460 members of the Sejm using the open party-list proportional representation electoral system.

1, was established in June 1991 by the Electoral Ordinance to the Sejm of the Republic of Poland (Ordynacja wyborcza do Sejmu Rzeczypospolitej Polskiej).

[5] Warsaw I currently elects 20 of the 460 members of the Sejm using the open party-list proportional representation electoral system.