How America Moves

Build Your Own Senate Map

Assign each state's two Senate seats and see which party reaches 51. All 100 seats, with states you can leave undecided or split one-and-one.

Build a map for
Democratic 0
Dem needs 51, Rep needs 51
51 for a majority
0 Republican
0 seats100 toss-up0 seats
Loading map…

In Cycle mode (the default), click a state to step its delegation through toss-up, both Democratic, split one-and-one, and both Republican; shift-click or right-click to step back. Or pick a delegation from the palette to paint it directly. All 100 seats are shown (each state elects two, in staggered classes); 51 is a majority. The District of Columbia has no senators.

Small states

A hypothetical scenario tool. Each state elects two senators in staggered classes, so not all 100 seats are up in any one year; 51 of 100 is a majority. This builder shows only the map and the count you assign; it does not forecast, and it draws on no results or migration data.