In many countries, the state, province, or region is a required part of a postal address. The information is used for shipping and billing information, to calculate tax rates, and so on. For countries where the state is not required, the field can be omitted entirely from the address, or included as an optional field.
Because standard address formats vary from one country to another, you can also edit the template that is used to format the address for invoices, packing slips, and shipping labels.
To set up the state options
On the Admin sidebar, tap Stores. Then under Settings, choose Configuration.
In the panel on the left under General, choose General.
Expand the State Options section, and do the following:
In the State is required for list, select each country where Region/State is a required entry.
Set the Allow to Choose State if It is Optional for Country field to one of the following:
Yes In countries where the state field is not required, includes the State field as an optional entry. No In countries where the state field is not required, omits the State field.
When complete, tap Save Config .