The American Economic Association is the largest organization for economists in the United States. Approximately 22,000 economists are members and 5,500 institutes subscribe. Members are primarily from academic institutions (50%) business and industry (35%), and the rest are with some level of government.
A list of other economics organizations and association can be found at:
There is an organization for women in economics under the American Economics Association, the CSWEP:
There is a Committee on the Status of Minority Groups in the Economics Profession under the AEA. (CSMGEP)
There is a Committee on Economic Education under the AEA. The mission of the Committee is to improve the quality of economics education at all levels: pre-college, college, adult, and general education.
Their website offers further information on the committee and its activities.