Milwaukee County, WI

2016:
H - 288,822 (65%)
T - 126,069 (28%)

2020:
B - 317,251 (69%)
T - 134,355 (29%)

That's a 9.8% increase of ballots for Biden over Hillary

28,429 more ballots

Wayne County, MI

2016:
H - 519,444 (66%)
T - 228,993 (29%)

2020:
B - 587,074 (68%)
T - 264,149 (30%)

That's a 13.0% increase of ballots for Biden over Hillary

67,630 more ballots

Dekalb County

2016:
H - 251,370 (79%)
T - 51,468 (16%)

2020:
B - 308,102 (83%)
T - 58,361 (15%)

That's a 22% increase of ballots for Biden over Hillary

56,732 more ballots

Fulton County

2016:
H - 297,051 (67%)
T - 117,783 (26%)

2020:
B - 379,095 (72%)
T - 136,716 (26%)

That's a 27.6% increase of ballots for Biden over Hillary

82,044 more ballots

Cobb County

2016:
H - 160,121 (47%)
T - 152,912 (45%)

2020:
B - 221,839 (56%)
T - 165,455 (42%)

That's a 38% increase of ballots for Biden over Hillary

61,718 more ballots