diff --git a/plugins/woocommerce-blocks/src/Assets/AssetDataRegistry.php b/plugins/woocommerce-blocks/src/Assets/AssetDataRegistry.php
index 5132a526a68..38c20f15a65 100644
--- a/plugins/woocommerce-blocks/src/Assets/AssetDataRegistry.php
+++ b/plugins/woocommerce-blocks/src/Assets/AssetDataRegistry.php
@@ -165,6 +165,16 @@ class AssetDataRegistry {
 		return $this->data;
 	}
 
+	/**
+	 * Allows checking whether a key exists.
+	 *
+	 * @param string $key  The key to check if exists.
+	 * @return bool  Whether the key exists in the current data registry.
+	 */
+	public function exists( $key ) {
+		return array_key_exists( $key, $this->data );
+	}
+
 	/**
 	 * Interface for adding data to the registry.
 	 *
diff --git a/plugins/woocommerce-blocks/src/BlockTypes/Cart.php b/plugins/woocommerce-blocks/src/BlockTypes/Cart.php
index 8f7f9db19fc..784f239be88 100644
--- a/plugins/woocommerce-blocks/src/BlockTypes/Cart.php
+++ b/plugins/woocommerce-blocks/src/BlockTypes/Cart.php
@@ -49,8 +49,12 @@ class Cart extends AbstractBlock {
 		$data_registry = Package::container()->get(
 			\Automattic\WooCommerce\Blocks\Assets\AssetDataRegistry::class
 		);
-		$data_registry->add( 'shippingCountries', WC()->countries->get_shipping_countries() );
-		$data_registry->add( 'shippingStates', WC()->countries->get_shipping_country_states() );
+		if ( ! $data_registry->exists( 'shippingCountries' ) ) {
+			$data_registry->add( 'shippingCountries', WC()->countries->get_shipping_countries() );
+		}
+		if ( ! $data_registry->exists( 'shippingStates' ) ) {
+			$data_registry->add( 'shippingStates', WC()->countries->get_shipping_country_states() );
+		}
 		\Automattic\WooCommerce\Blocks\Assets::register_block_script(
 			$this->block_name . '-frontend',
 			$this->block_name . '-block-frontend'
diff --git a/plugins/woocommerce-blocks/src/BlockTypes/Checkout.php b/plugins/woocommerce-blocks/src/BlockTypes/Checkout.php
index f4e725e54b0..3bbe140cec5 100644
--- a/plugins/woocommerce-blocks/src/BlockTypes/Checkout.php
+++ b/plugins/woocommerce-blocks/src/BlockTypes/Checkout.php
@@ -50,10 +50,18 @@ class Checkout extends AbstractBlock {
 		$data_registry = Package::container()->get(
 			\Automattic\WooCommerce\Blocks\Assets\AssetDataRegistry::class
 		);
-		$data_registry->add( 'allowedCountries', WC()->countries->get_allowed_countries() );
-		$data_registry->add( 'shippingCountries', WC()->countries->get_shipping_countries() );
-		$data_registry->add( 'allowedStates', WC()->countries->get_allowed_country_states() );
-		$data_registry->add( 'shippingStates', WC()->countries->get_shipping_country_states() );
+		if ( ! $data_registry->exists( 'allowedCountries' ) ) {
+			$data_registry->add( 'allowedCountries', WC()->countries->get_allowed_countries() );
+		}
+		if ( ! $data_registry->exists( 'shippingCountries' ) ) {
+			$data_registry->add( 'shippingCountries', WC()->countries->get_shipping_countries() );
+		}
+		if ( ! $data_registry->exists( 'allowedStates' ) ) {
+			$data_registry->add( 'allowedStates', WC()->countries->get_allowed_country_states() );
+		}
+		if ( ! $data_registry->exists( 'shippingStates' ) ) {
+			$data_registry->add( 'shippingStates', WC()->countries->get_shipping_country_states() );
+		}
 		\Automattic\WooCommerce\Blocks\Assets::register_block_script( $this->block_name . '-frontend', $this->block_name . '-block-frontend' );
 		return $content;
 	}
diff --git a/plugins/woocommerce-blocks/tests/php/Assets/AssetDataRegistry.php b/plugins/woocommerce-blocks/tests/php/Assets/AssetDataRegistry.php
index 942a949bdf0..c824fee38cc 100644
--- a/plugins/woocommerce-blocks/tests/php/Assets/AssetDataRegistry.php
+++ b/plugins/woocommerce-blocks/tests/php/Assets/AssetDataRegistry.php
@@ -31,6 +31,12 @@ class AssetDataRegistry extends WP_UnitTestCase {
 		$this->assertEquals( [ 'test' => 'foo' ], $this->registry->get() );
 	}
 
+	public function test_data_exists() {
+		$this->registry->add( 'foo', 'lorem-ipsum' );
+		$this->assertEquals( true, $this->registry->exists( 'foo' ) );
+		$this->assertEquals( false, $this->registry->exists( 'bar' ) );
+	}
+
 	public function test_add_lazy_data() {
 		$lazy = function () {
 			return 'bar';