| Value | Category |
|---|---|
| 0000 | Not in a metropolitan district |
| 0160 | Albany-Troy, NY |
| 0720 | Baltimore, MD |
| 1120 | Boston, MA |
| 1122 | Lowell, MA |
| 1280 | Buffalo, NY |
| 1600 | Chicago, IL/IN |
| 1640 | Cincinnati, OH/KY |
| 1680 | Cleveland, OH |
| 1840 | Columbus, OH |
| 2160 | Detroit, MI |
| 3480 | Indianapolis, IN |
| 3760 | Kansas City, MO/KS |
| 4520 | Louisville, KY |
| 5080 | Milwaukee, WI |
| 5480 | New Haven, CT |
| 5560 | New Orleans, LA |
| 5600 | New York, NY-Northeastern NJ |
| 6160 | Philadelphia, PA/NJ |
| 6280 | Pittsburgh, PA |
| 6480 | Providence, RI/MA |
| 6760 | Richmond, VA |
| 6840 | Rochester, NY |
| 7040 | St. Louis, MO/IL |
| 7360 | San Francisco-Oakland, CA |
| 7560 | Scranton, PA |
| 8160 | Syracuse, NY |
| 8400 | Toledo, OH |
| 8840 | Washington, DC/MD/VA |
| 9240 | Worcester, MA |