How to Get All State List In Magento for specific country

//below code load all the State  of US

$countryCode= ‘US’;

$states = Mage::getModel('directory/country')->load($countryCode)->getRegions();

$slist= array();

foreach ($states as $state) {

$sid = $state->getId();

            $sname = $state->getName();

            $slist[$sid]=$sname;                                                              

}

asort($slist);