[9] Seats in the National Council are apportioned to the cantons based on their respective population size (which includes children and resident foreigners who do not have the right to vote).

Based on the official population count recorded at the end of 2020, Basel-Stadt lost a seat while Zürich gained one.

[10] The rules regarding who can stand as a candidate and vote in elections to the National Council are uniform across the Confederation.

In the first round voters typically have up to two votes and candidates need an overall majority to be elected; if seats remain to be filled a runoff is held using simple plurality.

The average age is under 40 for the Greens and PS/SP, and it exceeds 50 for the smaller right-wing parties Ticino League and Geneva Citizens Movement.

[16] The chart below depicts opinion polls conducted for the 2023 Swiss federal election; trendlines are local regressions (LOESS).

[25] Although right-wing parties gained seats in the National Council, they did not secure a majority in the chamber.

[35] On 25 October, the Federal Statistical Office announced it had miscalculated the national vote count; this resulted from "a programming error in the data import software for the cantons of Appenzell Inner Rhodes, Appenzell Outer Rhodes and Glarus.