Automate the input form

I am just wondering if there is a way to automate the input for the form. The web site that I visit has a field where you can enter the zip code and it will give you the name of the sales manager of the zip code. What I need is the names of all the sales managers for all the zip codes in the US. I don’t want to seat there and input the zip code one by one. Is there a way to automate this process? Is there any open source application that can do this?

Thanks in advance