I have a zip code map which I added per zip code data too (a regional director for each zipcode), and then dissolved the map based on the director attribute. As you may or may not know, zip codes are really just postal routes, so areas in the U.S. that do not receive post, do not have zipcodes. Because of this, there are empty spaces on my map I want to fill.
So my question is, can I somehow merge my dissolved zip code map with a map of the US state boundaries, and use that to fill the empty spaces? I guess I could manually draw out the polygons to fill the gaps, but this would be incredibly time consuming.
Here is a snapshot of Maine to show what I'm explaining. Cyan is zipcode vector, grey is US state boundaries.