Huntington–Hill method

[1] Since 1941, this method has been used to apportion the 435 seats in the United States House of Representatives following the completion of each decennial census.

[2][3] The method minimizes the relative difference in the number of constituents represented by each legislator.

However, it is not clear if we should calculate the average before or after allocating an additional seat, and the two procedures give different results.

[5] In the U.S. House of Representatives, this is ensured by guaranteeing each state at least one seat;[5] in party-list representation, small parties would likely be eliminated using some electoral threshold, or the first divisor can be modified.

The Knesset (Israel's unicameral legislature), are elected by party-list representation with apportionment by the D'Hondt method.