Need to truncate/remove leading characters with Calculate Field

[Craig_Eissler_Iceman]

Hello, I simply need to truncate (remove) some leading characters with the Field Calculator, but can't recall which Python command I need to use. The purpose is to create a common field to Join Census Data with TIGER. See below:

[JohannesLindner · Accepted solution]

Depending on your naming scheme:

# if it's always the same start:
!GeoID!.replace("1000000US", "")

# if the number can change:
!GeoID!.split("US")[-1]

[Craig_Eissler_Iceman]

Ah yes, "Replace" -- thanks!