newsupernova/vendor/magento/module-shipping/etc/config.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Store:etc/config.xsd">
    <default>
        <shipping>
            <origin>
                <country_id>US</country_id>
                <postcode>90034</postcode>
                <region_id>12</region_id>
            </origin>
        </shipping>
    </default>
</config>