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

functions.php

add_filter( 'woocommerce_package_rates', 'xa_show_shipping_method_based_on_state', 10, 2 );

function xa_show_shipping_method_based_on_state( $available_shipping_methods, $package ) {
	
	$states_list = array( 'AK', 'HI', 'PR', 'GU', 'AS', 'VI', 'UM' );
	
	$eligible_services_for_states_list	=	array(
			'wf_shipping_usps:flat_rate_box_priority',
			'wf_shipping_usps:flat_rate_box_express',
			'wf_shipping_usps:D_FIRST_CLASS',
			'wf_shipping_usps:D_EXPRESS_MAIL',
			'wf_shipping_usps:D_STANDARD_POST',
			'wf_shipping_usps:D_MEDIA_MAIL',
			'wf_shipping_usps:D_LIBRARY_MAIL',
			'wf_shipping_usps:D_PRIORITY_MAIL',
			'wf_shipping_usps:I_EXPRESS_MAIL',
			'wf_shipping_usps:I_PRIORITY_MAIL',
			'wf_shipping_usps:I_GLOBAL_EXPRESS',
			'wf_shipping_usps:I_FIRST_CLASS',
			'wf_shipping_usps:I_POSTCARDS',			
		);
	
	// Basically, below code will reset shipping services if the shipping
	// state is other than defined states_list.
	if ( !in_array(WC()->customer->shipping_state, $states_list) ) {
		foreach ( $eligible_services_for_states_list as &$value ) {
			unset( $available_shipping_methods[$value] );		
		}
	}
	
	return $available_shipping_methods;
}