2000 ZCTA Zip Code Polygon Union (Merge) Demonstration


Functions:
Add Zipcode: Adds a zip code to the boundary. Add as many as you want.
Rebuild: Rebuilds the boundary from the list of zip codes in the text box.
Clear: Clears the boundary and resets the map.
Undo: Removes the last entry made and recalculates the boundary.
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