Data in pulldown menus

I have a large set of numeric data that I want to make available to people in a simplified form. I envision having two pulldown menus. One menu might give a choice of states. The other menu would give choices of specific information about states such as government revenues, costs, populations, and per-capita costs. Once a user selected both menus, the web page would return with the information for that state, with perhaps information about the average numbers for other states.

I am comfortable with HTML but not CSS. Is there a WordPress plugin or some other simple way of doing this?