How many electors currently serve in the Electoral College and how is that the membership distributed?

538 members: 100 Senators (2 from each state), 435 (all representatives from the House representing every state), plus 3 electors for the District of Columbia
1539 members: 10 representatives from each state sitting in the Senate, 435 representatives from the House, plus 4 representatives from the District of Columbia
The precise number of electors in the college varies from one election to another as it is based on the number of citizens who cast ballots
101 members: 1 representative from the House and 1 representative from the Senate for each of the 50 states, plus an additional 1 representative for the District of Columbia