diff --git a/changelog/fix-allow-addresses-from-woo-supported-countries b/changelog/fix-allow-addresses-from-woo-supported-countries
new file mode 100644
index 00000000000..626fd1ce34f
--- /dev/null
+++ b/changelog/fix-allow-addresses-from-woo-supported-countries
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+
+Checkout: Fix error when wc_address_i18n_params does not have data for a given country
diff --git a/client/checkout/classic/event-handlers.js b/client/checkout/classic/event-handlers.js
index fe53b9b2a88..95856896226 100644
--- a/client/checkout/classic/event-handlers.js
+++ b/client/checkout/classic/event-handlers.js
@@ -308,8 +308,8 @@ jQuery( function ( $ ) {
 				if ( country && locale && fieldName !== 'billing_email' ) {
 					const key = fieldName.replace( 'billing_', '' );
 					isRequired =
-						locale[ country ][ key ]?.required ??
-						locale.default[ key ]?.required;
+						locale[ country ]?.[ key ]?.required ??
+						locale.default?.[ key ]?.required;
 				}
 
 				const hasValue = $field?.value;