If you have the persons' phone number you can put into a search engine reverse searches and a few will pop up. You can also use these to look up the street if you know it and it will give you all houses and occupants on the street.
You can try using online People Search websites such as WhitePages or PeopleSearch. You can also try Facebook or MySpace to find them. This is more helpful since it includes pictures. To find a long lost classmate there is also and
