Physical address lookup?

I dumped my customer database to an excel spreadsheet and noticed I am missing a lot of physical mailing addresses of my customers. I only have their first and last name and the city and state that they live in. Is there a web site that let me up upload my excel file and import all the physical address to it|||Import them from where? If the addresses aren't in the database you'll have to enter them one by one by hand. If they're in the database just import them from the database. You don't need a website.|||I am pretty sure you can't do this automatically, as you could imagine the amount of spam people would be getting. However, whitepages.com will allow you to search by name and city. Hope this helps.