Per the IRS How EINs are Assigned and Valid EIN Prefixes webpage:
The EIN prefix now only indicates which campus assigned the EIN. Each campus has certain prefixes available for use, as well as prefixes that are solely for use by the online application and the Small Business Administration. The prefix breakdown is shown in the table below:
| Campus/ Other Location | Valid EIN Prefixes |
| Andover | 10, 12 |
| Atlanta | 60, 67 |
| Austin | 50, 53 |
| Brookhaven | 01, 02, 03, 04, 05, 06, 11, 13, 14, 16, 21, 22, 23, 25, 34, 51, 52, 54, 55, 56, 57, 58, 59, 65 |
| Cincinnati | 30, 32, 35, 36, 37, 38, 61 |
| Fresno | 15, 24 |
| Kansas City | 40, 44 |
| Memphis | 94, 95 |
| Ogden | 80, 90 |
| Philadelphia | 33, 39, 41, 42, 43, 46, 48, 62, 63, 64, 66, 68, 71, 72, 73, 74, 75, 76, 77, 85, 86, 87, 88, 91, 92, 93, 98, 99 |
| Internet | 20, 26, 27, 45, 46, 47, 81, 82, 83, 84, 85, 86, 87, 88, 92, 93 |
| Small Business Administration (SBA) | 31 |