Snippet to restrict WooCommerce shipping methods based on the state and ZIP/Post code. Supports PluginHive Shipping Plugins: https://www.pluginhive.com/product-category/woocommerce-plugin/woocommerce-shipping/

function.php

add_filter('woocommerce_package_rates', 'wf_restrict_shipping_methods_based_on_state_and_zipcode', 10, 2);
function wf_restrict_shipping_methods_based_on_state_and_zipcode($available_shipping_methods, $package){
    $destination    = $package['destination'];
    $dest_postcode  = $destination['postcode'];
    $dest_state     = $destination['state'];
   
    //Config this array with state code, zip code, and services you have to show.
    $restrict_methods = array(
        'CA'=>  array(
            //Show only UPS Ground for California have zip code start with 910
            '910' => array(
                'wf_shipping_ups:03',
            ),

            //Show only UPS Ground and 3 Day Select for California have zip code start with 912
            '912' => array(
                'wf_shipping_ups:03',
                'wf_shipping_ups:12',
            ),
        ),

        // Show only Ground and 3 Day Select for everywhere in New York
        'NY'=>  array(
            '*' => array(
                'wf_shipping_ups:03',
                'wf_shipping_ups:12',
            ),
        ),

    );

    foreach ($available_shipping_methods as $current_service => $value) {
        if( !empty($restrict_methods[$dest_state]) ){
            foreach ($restrict_methods[$dest_state] as $postcode => $services_arr) {
                if( ( $postcode == '*' || strstr( (string)$dest_postcode, (string)$postcode ) ) && in_array($current_service, $services_arr) ){
                    unset($available_shipping_methods[$current_service]);
                }
            }
        }
    }
    return $available_shipping_methods;
}