strings

[suds]

at this point I'm just guessing because I don't know

[Albatross]

else
{
        cout << "Oi, that's not a proper ZIP code!";
        cout << "Enter a five-character ZIP code (-1 to end): ";
	cin >> zipCode;
}

Have you dealt with the else-if block?

-Albatross

[suds]

some ... but I don't see where the if part that indicates it meets the parameters of starting with 605 or 606

[Albatross]

I just gave you the else block, that's all. Not the if and the else if... I thought you dealt with those?

-Albatross

[suds]

I don't know how to indicate the range for the zipcode parameters

[Albatross]

Convert the zipcode string to an int and then use > and <?
http://cplusplus.com/articles/numb_to_text/

-Albatross