Thank you for making your attention to my question.
I'd like to show Region List ordered by region_id on the DB with RegionUpdater. Currently its ordered by Region's name alphabet. I tried to modified the following files but haven't succeed to change it.
Modified file: "./app/code/core/Mage/Directory/Helper/Data.php" tried to add "->setOrder('region_id', 'ASC')"
Our environment is Magento 18.104.22.168.