Per the IRS page How EINs are Assigned and Valid EIN Prefixes, the prefix for an EIN number indicates which campus assigned it. Valid EIN numbers start with the following prefixes.

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
• Small Business Administration (SBA) - 31