Set WooCommerce base location so that local city/county taxes are charged if local pickup is selected as the shipping option.

gistfile1.txt

add_filter( 'woocommerce_countries_base_postcode', 'force_local_pickup_tax_location_zip' );

function force_local_pickup_tax_location_zip(){
    return '90210';
}

add_filter( 'woocommerce_countries_base_city', 'force_local_pickup_tax_location_city' );

function force_local_pickup_tax_location_city(){
    return 'Beverly Hills';
}

WooCommerce Documentation uses deprecated php: https://docs.woocommerce.com/document/local-pickup/
'create_function' is deprecated since 7.2.0
add_filter( 'woocommerce_countries_base_postcode', create_function( '', 'return "80903";' ) );
add_filter( 'woocommerce_countries_base_city', create_function( '', 'return "COLORADO SPRINGS";' ) );

From php.net: "Warning This function has been DEPRECATED as of PHP 7.2.0. Relying on this function is highly discouraged."