A way to remove US state from shipping and billing country list.

Moving to the right project.

Marking this a duplicate of #1829900: [meta] Address Field 2.x needs pluggable administrative areas and an actual API. In the meantime, you just have to use hook_form_alter().

This page came up first when searching for drupal commerce addressfield hide state, so I'll leave this here...

You can "hide" the states from checkout using CSS, display:none; It's not ideal, but it's better than offering products to folks in all of the outlying United States locations when there's no easy way to actually offer cost-effective shipping to those locations...

Here's a template of CSS to get you started:

/* hide the following states from the checkout shipping profile
 * no shipping available to these locations */

.customer_profile_shipping select option[value="AK"],
.customer_profile_shipping select option[value="HI"],
.customer_profile_shipping select option[value="AA"],
.customer_profile_shipping select option[value="AE"],
.customer_profile_shipping select option[value="AP"],
.customer_profile_shipping select option[value="AS"],
.customer_profile_shipping select option[value="FM"],
.customer_profile_shipping select option[value="GU"],
.customer_profile_shipping select option[value="MH"],
.customer_profile_shipping select option[value="MP"],
.customer_profile_shipping select option[value="PW"],
.customer_profile_shipping select option[value="PR"],
.customer_profile_shipping select option[value="VI"],
.customer_profile_shipping select option[value=" "]
{display: none;}

NOTE: If you're using the chosen module, go add the following to the "enable area" of chosen, to disable it on the checkout forms:

(Yes, this is counter intuitive)

select:visible, select.state:not

A better solution is to do a hook_addressfield_administrative_areas_alter() and then restrict the administrative areas keyed by the country.

/**
 * Implements hook_addressfield_administrative_areas_alter()
 */
function custom_module_addressfield_administrative_areas_alter(&$administrative_areas) {
  // This will restrict the states to Alabama and Arizona for US.
  $administrative_areas['US'] = array(
     'AL' => t('Alabama'),
     'AZ' => t('Arizona'),
  );
}