Wordpress Plugin - Associate article with US city/county/st

I am looking a wordpress developer guru to develop a wordpress plugin that allows me to associate an article with US states, counties and cities. Eg.: I have a post A into my blog. I want a box, below the edit article content box where I can tell the wordpress the states that I want this post associate with, the counties and the cities. There are no limits of states, counties or cities that I can associate with the article. I want all this working without reload the page and I want a location suggest, like the Expedia Location Suggest, but for a location. I will provide the US database with the state, counties and cities names. It is almost like a "tagging" system, but for cities, counties and states. I want a function where I can call into my template to return an array with the associated states, another one to return an array with the counties and another one to return an array with the cities. (PHP arrays). It is important to create a function to check if are there any states, counties or cities associated with the post. I really want to see some examples of work you did before hire you. Show me some Wordpress plugins and not random web development. I am looking a wordpress guru and not a simple web developer.