States & Provinces are configured in Setup / Regional Settings / Countries / Country
Countries and states can be configured on this screen. Once setup, they will be available when configuring addresses on account contacts and companies.
Countries and states can be setup immediately, there are no prerequisite configuration steps.
The Countries List panel on the left of this screen allows you to view and select existing countries and states that have been setup. After selecting a state you will be able to edit state settings. Actions are also available in this panel which are shown as icons above the Filter text box. The available actions are described below.
Expands or collapses the list of countries and states
The information in this panel reflects the currently selected state. From here you can change state details (fields will display a red left border if a value is required and purple text if the field is read-only and cannot be modified).
Edit State Fields:
Name: the name of the state/province
Abbreviation: the abbreviation used to reference the state