523-8. That's 98.5%-1.5%
FDR took 76% of FLA. 70% of VA. 73% of NC. 97% of MS. It was more competitive in the Northeast, but even there he took most states by 60-40 or better. He took the mountain states by closer to 70-30.
Source: http://uselectionatlas.org/RESULTS/national.php?f=0&year=1936
And his other victories were similarly massive.
1936 Election
1940 Election
1944 Election