There are about 55 States in the US. Each State has a "State Board of Accountancy" that is responsible for licensing Certified Public Accountants (CPAs) who practice in that state. Each board issues rules that govern what a person must do in order to become a licensed CPA. National Association of State Boards of Accountancy (NASBA) is the association of the 55 State Boards of Accountancy.
Founded in 1887, the American Institute of Certified Public Accountants (AICPA) represents the CPA profession nationally regarding rule-making and standard-setting, and serves as an advocate before legislative bodies, public interest groups and other professional organizations. The AICPA develops standards for audits of private companies and other services by CPAs; provides educational guidance materials to its members; develops and grades the Uniform CPA Examination; and monitors and enforces compliance with the profession’s technical and ethical standards.
Prometric center is a US based company which has testing centers across the globes and is known for conducting tests in the most secure and efficient manner. The CPA exams are conducted at a Prometric center.