What if you put counties on the level of detail shelf and Districts on the color shelf? Then, all the counties would be on the view, but because of the colors, the user would be able to see which district a county belonged to.
Hope this helps!
Thanks for the response Tracy. But I am looking to report sales or other measures for each district on the map. Anyhow the colors for each district are too many to be meaningful.
Is there a way to create a "district" level geo location?
If you define table calculations to aggregate your data at the district level, but with County on the Level of Detail, Tableau will draw the areas for all Counties, so you will see the County boundaries, but all Counties in a District will be coloured the same. You can turn off the borders to make the County boundaries less visible - though you will still see faint hairlines.
I've attached an example with the Coffee Chain data - the measures are calculated by Market (which is a group of States), but State is the thing that is geocoded, so needs to be on Level of Detail.
Sales by Market.twbx.zip 191.5 KB