It's a little obscure, since the address details are built based on the appropriate format for the country they're related to.

The company name is simply added on top.

You can change it by finding the following
Code:
    if ( (ACCOUNT_COMPANY == 'true') && (zen_not_null($company)) ) {
      $address = $company . $cr . $address;
    }
and changing it like this:
Code:
    if ( (ACCOUNT_COMPANY == 'true') && (zen_not_null($company)) ) {
      $address = $address . $cr . $company;
    }