How to check if an ein is valid

Updated April 17, 2017

An Employer Identification Number (EIN) is a nine digit number associated with a company or corporation. The Internal Revenue Service (IRS) issues an EIN to a business entity. Most businesses are required to have an EIN. A sole proprietorship can use either an EIN or the owner's social security number to identify the business.

It is relatively easy to verify that the EIN you have for your company is valid.

Check the list below to see if you have a valid EIN prefix. An EIN prefix is the first two digits of the EIN. If the IRS issued the number before 2001, the EIN prefix specifies the geographic area in which the business resides. Starting in 2001, the IRS changed the EIN prefix to correspond to one of ten different campuses. Additionally, there is also a prefix, which corresponds to the Small Business Administration and to applications submitted on the IRS website.

According to the IRS, the valid campus or location EIN prefixes are:

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, 45, 46, 47, 48, 62, 63, 64, 66, 68, 71, 72, 73, 74, 75, 76, 77, 81, 82, 83, 84, 85, 86, 87, 88, 91, 92, 93, 98, 99

Internet--20, 26, 27 Note: The Philadelphia campus previously assigned prefixes 26 and 27. Small Business Administration--31

Visit the HIPPASpace website (see Resources). Once you get to the HIPPASpace website, type in your EIN and press “Validate”. You can use the HIPPASpace website to quickly determine whether your EIN is valid.

Call the IRS Business and Specialty Tax Line at (800) 829-4933 to speak with a representative. Be prepared to give the IRS representative your EIN, and let the him know that you want to verify whether or not the number is valid.


Some people use the terms Employer Identification Number and Federal Tax Identification Number interchangeably. Have paper and a pen or pencil available to take notes while talking to the IRS representative.

Things You'll Need

  • Employer Identification Number
  • Internet
  • Phone
  • Paper
  • Pen or pencil
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About the Author

Residing in Durham, N.C., Qiana Eaglin has been writing technical documentation for software companies since 2003. She received a Bachelor of Science in electrical engineering from Morgan State University and a Master of Business Administration from Pfeiffer University. She writes for eHow and Trails Travel.