| Value | Category |
|---|---|
| 0000 | Not in a metropolitan district |
| 0160 | Albany-Troy, N.Y. |
| 0720 | Baltimore, Md. |
| 1120 | Boston, Mass. |
| 1640 | Cincinnati, Ohio-Ky. |
| 4520 | Louisville, Ky. |
| 5560 | New Orleans, La. |
| 5600 | New York, N.Y.-Northeastern New Jersey |
| 6160 | Philadelphia, Pa.-N.J. |
| 6280 | Pittsburgh, Pa. |
| 7040 | St. Louis, Mo.-Ill. |