I have three classes; State, County, and City. State contains a list of County. County contains a list of City.

public class State
{
  public string StateCode;
  List<County> Counties;
  List<string> CitiesInState
  {
    get
    {
      return //LINQ STATEMENT TO GET LIST OF ALL CITYNAMES FROM LIST OF COUNTIES
    }
  }
}
 
public class County
{
  public string CountyName;
  List<City> Cities;
}
 
public class City
{
  public string CityName;
}

I am trying to return a list of all CityNames within the State. Since this is a property of an item that is in a List which is an item within another List, I'm not sure it is possible. I haven't been able to write anything that will even compile. Is this possible? Can someone point my in the right direction?