I have a project that I am working on that is looking at alumni from my school. I have the number of alumni per zip code but I would like to analyze it also by county. How can I do this?
are the zips fully contained within the county? If so you could summarize the zip data and join the resultant to the county file. You might have to use a spatial join if you don't have a common attribute field.
No, they are not. I have the counties and zip codes as two different shapefiles.
spatial join then
Retrieving data ...