It sounds like you have point data and want to map them into counties, correct? If you want to assign county locations to the points, you can use the spatial join / intersection feature in Tableau to link your points to county polygons. You can't use the Tableau geocoding data directly, but you can use high-quality boundary data from the US Census easily - download the shapefile data here: Cartographic Boundary Files - Shapefile
Then do the join in Tableau: Join Spatial Files in Tableau - Tableau
Let me know if that isn't what you are trying to do...
I downloaded a county .shp (cb_2018_us_county_500k.zip) file to use w/ my excel file. Unfortunately, I don't see or understand how any of the fields can be joined together because neither have similar fields. I tried finding the answer online, but my version of Tableau, 19.3, doesn't seem to have the intersect option when trying to do joins. When I try to do a normal join, I end up with 160k+ records...the sample data only contains 41.
Sorry, I'm at a loss to explain what's going on.
On 19.3 you should be able to use MakePoint() to convert the data in your csv to geometries to use the intersection function. The join should look like this:
To add the MakePoint() function in to the join, click on the drop down under the sample data Data Source and select 'Edit Join Calculation'
Then use the Calculation:
Once you have that, you can select the Intersects option from the dropdown:
And set 'Geometry' for the field from the counties file. I used a census Region file because I happened to have it handy in my downloads folder, but should work exactly the same with your counties shapefile
Let me know if this doesn't work for you... I've attached a 19.3 workbook with my regions shapefile for reference. It isn't super exciting because all of the points fall in the same polygon, but I think it might help explain the general process.
RecoverySampleTest-seb.twbx 684.5 KB