Who is on the US 1.00 coin?

It depends on which $1 coin you mean. The large dollars from the 1970s featured president Dwight Eisenhower. Then from 1979-1981 and again in 1999 it was Susan B. Anthony on a smaller dollar coin. In 2000, the mint started making gold-colored dollars with Sacagawea. Then in 2007, they began the presidential dollar series with four presidents per year, starting with George Washington and currently up to James Garfield (that's 20 presidents).