How to restrict the suggested addresses to a specific country ?

You can restrict the suggested addresses to a specific country.

Just add this code to your functions.php theme file.
There is two part of code, first one for the billing dropdown, second one for the shipping dropdown. You can use only one, or both. Just change the two-letters country code to fit your needs.

//billing dropdown
add_filter('woogoogad_restrict_billing_country_filter', 'my_google_billing_country');
function my_google_billing_country()
{
	return 'US'; //change with the two-letters country code you want
}

//shipping dropdown
add_filter('woogoogad_restrict_shipping_country_filter', 'my_google_shipping_country');
function my_google_shipping_country()
{
	return 'US'; //change with the two-letters country code you want
}

Notes: It's only possible to restrict to a specific country, Google API doesn't not allow us to restrict to a list of countries.