Just change the url paramenters

Zip codes within a radious of miles
http://www.4i4.net/zip2me/?zip=77024&dist=10

Our zip code radious web service powers the Motorway web site search function for over 50 newspapers.

Counties within a state
http://www.4i4.net/zip2me/?state=CO

Cities/zips within state/county
http://www.4i4.net/zip2me/?state=TX&county=Harris

Check out these inovative VOIP solutions
http://4i4.net/phone/help.htm

Here is an XML address validation and correction service
http://4i4.net/address/help.htm

And an XML service for email address validation
http://4i4.net/email//help.htm