There have only been 4 presidents will full beards. I have listed them below with some interesting facts and a weird connection between all of them.
James A. Garfield
Benjamin Harrison (Also sported a longer beard at one point)
Also while doing a little research, I noticed some weird trends amongst these names!
1. Each one of these fully bearded presidents were in the Republican Party.
This next one is even crazier...
2. Each one was born in the State of Ohio.
And stepping away from the full beard thing. The last president to have any facial hair was William Howard Taft in 1913, who sported a solo stache. Oddly enough, this man too was both
1. a Republican, and
2. Born in Ohio
William Howard Taft
Oh, and the last full beard was Benjamin Harris, listed above, in 1893.