Question

I know that one way is to have a table in database with all the states and then you would read it in your form. Is there any easier way in your opinion guys ?

I feel bad asking for something like this since it is so elementary however I would suppose something as simple like this would already be implemented in Drupal.

Answer 1

No need to hit the database. Build yourself a function that returns an array of the states.

$form['state'] = array(
  '#type' => 'select',
  '#options' => mymodule_states_list(),
  '#title' => t('State'),
);

function mymodule_states_list() {
  return array(
    'AL' => 'Alabama',
    'AK' => 'Alaska',
    ...
    'WY' => 'Wyoming',
  );
}