City, State, Zip, Latitude and Longitude list for Real Estate Website

I have a list of cities/zip codes in the united states. Each row includes the city, state, zip code and the latitude and longitude of each. It seems as though I am missing a ton of cities. And I have a ton of cities that do not have zip codes populated. So I need someone to take the list I have and add the missing cities along with the zip code, state, latitude and longitude. And I also need for the cities with missing zip codes to populate their correct zip code. ## Deliverables I will provide the data once I accept bid.