Oftentimes in applications users need to provide a country (e.g. as part of an address) and it would be nice to show a Select with all available countries rather than having them freely enter it in a TextInput. For multi-language applications it would then also be great to show the country list in the current locale rather than just English.

Achieving this is quite easy using the iso3166 package and PHP's intl extension.

Install the iso3166 package by thephpleague:

$ composer require league/iso3166

and require the intl extension in your composer.json:

"require": {
    ...
    "ext-intl": "*"
},

Then create a new PHP class somewhere in your project (e.g. in app/Filament/Forms/Components/) that extends the default Select component:

<?php
 
namespace App\Filament\Forms\Components;
 
use Filament\Forms\Components\Select;
use Illuminate\Support\Facades\App;
use League\ISO3166\ISO3166;
use Locale;
 
class LocalizedCountrySelect extends Select
{
    protected function setUp(): void
    {
        parent::setUp();
 
        $iso3166 = new ISO3166();
 
        foreach ($iso3166 as $data) {
            $this->options[$data['alpha2']] = Locale::getDisplayRegion("-{$data['alpha2']}", App::currentLocale());
        }
    }
}

And that's it. Now you have a form component that shows a list of countries in the current user's locale and saves the standardized country code. If you want to save the country name instead, just use $data['name'] for the options' key.