The 51st Democratic US Senate seat from the 2020 US Senate Election results is IA.

Democrats will hold onto
36)RI(Reed-D)
37)MA(Markey/Kennedy-D)
38)IL(Durbin-D)
39)DE(Coons-D)
40)OR(Merkley-D)
41)NJ(Booker-D)
42)VA(Warner-D)
43)NM(Lujan-D)
44)NH(Shaheen-D)
45)MN(Smith-D)
46)MI(Peters-D)
Pick up
47)AZ special(Kelly-D)
48)CO(Hickenlooper-D)
49)ME(Gideon-D)
50)NC(Cunningham-D)
IA(Greenfield-D) is the 51st Democratic US Senate seat. IA is a swing state at the Presidential Level.