The most common US currency note is $100

The second most common is $1

Volume of currency in circulation, in billions of notes (2022)
https://www.federalreserve.gov/payme...circvolume.htm
$1: 14.3
$2: 1.5
$5: 3.5
$10: 2.3
$20: 11.5
$50: 2.5
$100: 18.5

Value of currency in circulation, in billions of dollars (2022)
https://www.federalreserve.gov/payme...rcircvalue.htm
$1: $14.3
$2: $3.0
$5: $17.5
$10: $23.3
$20: $230.2
$50: $124.2
$100: $1,846.6