diff --git a/app/code/Magento/Checkout/view/frontend/web/js/model/new-customer-address.js b/app/code/Magento/Checkout/view/frontend/web/js/model/new-customer-address.js
index f9dae2691e5f3..7b858c92bee34 100644
--- a/app/code/Magento/Checkout/view/frontend/web/js/model/new-customer-address.js
+++ b/app/code/Magento/Checkout/view/frontend/web/js/model/new-customer-address.js
@@ -25,6 +25,8 @@ define([
         if (countryId) {
             if (addressData.region && addressData.region['region_id']) {
                 regionId = addressData.region['region_id'];
+            } else if (!addressData['region_id']) {
+                regionId = undefined;
             } else if (countryId === window.checkoutConfig.defaultCountryId) {
                 regionId = window.checkoutConfig.defaultRegionId;
             }