how to delete wordpress.com Account

You can not delete your WordPress accounts However, you can easily delete your blog or just leave your account inactive Delete the Blogs

  • Go to your blog and login to your account.
  • Click "My Blogs" on the left menu
  • Click on the name of the blog you want to delete
  • Click on "Tools" on the left menu
  • Choose "Delete Site" on the left menu under "Tools"
  • From the next dropdown, select "Permanently delete the blog and all content"
  • Confirm that you want to delete the blog
For More Details : http://en.support.wordpress.com/deleting-accounts/