I need to add zip code search to my current search page. - repost

I currently have a website like that works similar to freelancer. But my current search feature does not have the ability to search for projects or freelancers by zip code radius. Right now you can only search by manually selecting city,state in the drop down box which is a big hassle. So i need someone to make my search more attractive and add zip code feature for the US. Please only bid if you have knowledge of how to do. I am not looking to waste [login to view URL] me for the website [login to view URL] site is based in Wordpress and is a themes that I bought. Remember I need my website to have a fully functional zip code search. I do not have zip codes in database so they must be added. When registering for the site as an Artist I need the Artist to be able to enter their zip code of their home and city and state. In the project search I want same options to look for projects by city,state or zip code. I have attached some pages so you will see them here. The search bar that is current in website header needs to be updated for Artist search as I have changed in the picture. Please let me know if you can do this and how long!