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Right now the filled maps work with specific geographic entities such as County, Zip and State. If you are able to include a field containing the state or zip data in your data set (it also needs to be recognized in Tableau as a valid Geographic Data field), select your state or zip and choose a filled map; with county you would need to include both county and state within two separate fields.
Tableau does not have reverse geocoding functionality, so it is unaware of the details about a particular set of coordinates. If you need reverse geocoding assistance to determine zip or state, consider going to http://www.findlatitudeandlongitude.com/batch-reverse-geocode/#.UL34C4Ygisx to look up the nearest address to the coordinates provided (this is a free site, though it may have limits to the amount it will allow you to process).
If you are adding the filled map to go behind the existing points, place a second copy of your latitude field on the Rows shelf. Click the down arrow on the Marks shelf, and select Multiple Mark Types. Where it indicates "All", click the right arrow until you come across the second instance of your latitude field. Move the Zip or State field to the level of detail shelf (if using county level info to populate the map, you would need both county and state fields), then change the mark type to Filled Map. To have the filled map appear behind the existing points, right click on your second latitude field on the rows shelf and select Dual Axis.
Hope this helps,
You're awesome! Thank muchly.
I've found that my primary data source (DataSift), actually transforms the lat/long into city/state- I just need to snarf and split that field (which I hadn't done with my original dataset).
Got a new download of my dataset going, and we'll see how this new set works.