How To Get Region or State List by Country id in Magento 2 / Adobe Commerce

The following below code in your Block of your custom module

Step [1] – Code inside your block / controller / helper file

<?php
/*
 * John_Country

 * @category   Adobe Commerce Region / State List By Country ID
 * @package    Country Form
 * @copyright  Copyright (c) 2023 - Mage2DB.com
 * @Email      johndusa1021@gmail.com
 * @version    1.0.0
 */
namespace John\Country\Model;

use Magento\Directory\Model\Country;
use Magento\Directory\Model\CountryFactory;

class Country
{
/**
* @var Country
*/
public $countryFactory;

public function __construct(
    CountryFactory $countryFactory
) {
    $this->countryFactory = $countryFactory;
}

/**
 * Region / State List By Country ID
 *
 * @return string
 */
Public function getregionsOfCountry($countryCode) {
 $regionCollection = $this->countryFactory->create()->loadByCode($countryCode)->getRegions();
        $regions = $regionCollection->loadData()->toOptionArray(false);
        return $regions;
    }

}

Step [2] – if you have written above code in your Custom Block, call this Block in your custom template.

<?php
/*
 * John_Customercompanycreation

 * @category   Adobe Commerce Region / State List By Country ID
 * @package    Customerregister Form
 * @copyright  Copyright (c) 2023 - Mage2DB.com
 * @Email      johndusa1021@gmail.com
 * @version    1.0.0
 */
?>
<?php
 $countryCode="US";

 echo"<BR><B>Country=</b>".$block->getCountryName($countryCode);

foreach($block->getregionsOfCountry($countryCode) as $key=>$regionlist):

  if($key>0): 
  echo"<BR><b>Region / State ID==".$regionlist['value']."&nbsp;&nbsp;&nbsp;&nbsp;"."Region / State ID==</b>".$regionlist['title'];
  endif;
endforeach;

?>