County FIPS codes are assigned based on valid USPS ZIP codes.
If the USPS ZIP code is invalid, county value is transformed to FIPS based on a state and county name match.
If the USPS ZIP code is invalid the value is replaced with NULL.
Action / Resolution
Please enter a complete description of how the field should be used given the known issue, or describe any workaround that has been identified to nullify the issue.