How to limit google autocomplete results to City and Country only

You can try the country restriction

function initialize() {

 var options = {
  types: ['(cities)'],
  componentRestrictions: {country: "us"}
 };

 var input = document.getElementById('searchTextField');
 var autocomplete = new google.maps.places.Autocomplete(input, options);
}

More info:

ISO 3166-1 alpha-2 can be used to restrict results to specific groups. Currently, you can use componentRestrictions to filter by country.

The country must be passed as as a two character, ISO 3166-1 Alpha-2 compatible country code.

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Officially assigned country codes