Most of the membership forms include a country list.
Urbano Alvarez is presenting ready to use country list data in several languages.
The lists are in the HTML format as:
<select id="countrySelect" >
<option value="AF">Afghanistan</option>
<option value="AL">Albania</option>
<option value="DZ">Algeria</option>
<option value="AS">American Samoa</option>
</select>
For country lists in SQL format, you can also use the files at:
Advertisements:
ioDeck, a self-hosted and awesome PHP form generator.
Professional XHTML Admin Template ($15 Discount With The Code: WRD.)
SSLmatic – Cheap SSL Certificates (from $19.99/year)