The Census determines representation in the House of Representatives.
- Census data is used to determine how many seats your state gets in the House of Representatives.
- Census data is used for redrawing the boundaries of federal and state legislative districts.
- Census data impacts a state's number of electors in the Electoral College.
The Census determines the number of electors from each state in the Electoral College.
The number of electors apportioned to each state is the same as the number of members in the Senate and House of Representatives. Therefore, if a state loses seats in the House of Representatives due to undercounting or population loss, it will lose the same number of electors in the Electoral College.
United States Census 2020, Importance of the Data.
National Archives, What is the Electoral College?