Effecient modules which will give me users location and country information
Take a look at Smart IP.


  Smart IP identify visitor's geographical location (longitude/latitude), country, region, city and postal code based on the IP address of the user. These information will be stored at session variable ($_SESSION) with array key 'smart_ip' and Drupal $user-&gt;data object with array key 'geoip_location' of the user but optionally it can be disabled (by role) at Smart IP admin page.