To Register a trade name:

Sole Proprietors & Partnerships:

Secretary of State
1700 W Washington, 7th Floor
Phoenix  AZ  85007
(602) 542-4285
http://www.azsos.gov

Corporations, Limited Liability Companies, etc

Arizona Corporation Commission
1300 W Washington
Phoenix  AZ  85007
(602) 542-3026
http://www.cc.state.az.us

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To obtain a federal identification number (FEIN):

Internal Revenue Service
P.O. Box 9941
Ogden UT 84201
(800) 829-3676 or (801) 620-3645
http://www.irs.gov

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To apply for a Transaction Privilege Tax License – (commonly referred to as Sales Tax):

Arizona Department of Revenue
1600 W Monroe
Phoenix AZ 85007
(602) 542-4576
Arizona Department of Revenue 
Licensing Guide
Tax Rate Tables

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To apply for a Contractor's License:

Arizona Registrar of Contractors
1700 W. Washington Street, Suite 105
Phoenix AZ 85007
(602) 542-1525
http://www.azroc.gov

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To apply for a Maricopa County Health Permit:

Maricopa County Environmental Services Department
Environmental Health Division
1001 N. Central Avenue, Suite 300
Phoenix, AZ 85004
(602) 506-6970
http://www.maricopa.gov/EnvSvc/EnvHealth

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For more business resources:

Arizona Commerce Authority
Small Business Services
333 N. Central Avenue, Suite 1900
Phoenix AZ 85004
(602) 845-1295 or (800) 542-5684
http://www.azcommerce.com/smallbiz
Arizona Entrepreneur’s Edge (AzEE)
Checklist Program to Start, Operate and Grow a Business in Arizona