Modified from this United States Census Bureau file, based on the following Census definitions lists:

• Metropolitan Statistical Areas
• Micropolitan Statistical Areas
• Combined Statistical Areas

US Government work is public domain, and my work is

I, the copyright holder of this work, release this work into the public domain . This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose , without any conditions, unless such conditions are required by law.