Nonprofit501a: Non-profit type referring to Farmers’ Cooperative Associations.

Nonprofit501c1: Non-profit type referring to Corporations Organized Under Act of Congress, including Federal Credit Unions and National Farm Loan Associations.

Nonprofit501c10: Non-profit type referring to Domestic Fraternal Societies and Associations.

Nonprofit501c11: Non-profit type referring to Teachers' Retirement Fund Associations.

Nonprofit501c12: Non-profit type referring to Benevolent Life Insurance Associations, Mutual Ditch or Irrigation Companies, Mutual or Cooperative Telephone Companies.

Nonprofit501c13: Non-profit type referring to Cemetery Companies.

Nonprofit501c14: Non-profit type referring to State-Chartered Credit Unions, Mutual Reserve Funds.

Nonprofit501c15: Non-profit type referring to Mutual Insurance Companies or Associations.

Nonprofit501c16: Non-profit type referring to Cooperative Organizations to Finance Crop Operations.

Nonprofit501c17: Non-profit type referring to Supplemental Unemployment Benefit Trusts.

Nonprofit501c18: Non-profit type referring to Employee Funded Pension Trust (created before 25 June 1959).

Nonprofit501c19: Non-profit type referring to Post or Organization of Past or Present Members of the Armed Forces.

Nonprofit501c2: Non-profit type referring to Title-holding Corporations for Exempt Organizations.

Nonprofit501c20: Non-profit type referring to Group Legal Services Plan Organizations.

Nonprofit501c21: Non-profit type referring to Black Lung Benefit Trusts.

Nonprofit501c22: Non-profit type referring to Withdrawal Liability Payment Funds.

Nonprofit501c23: Non-profit type referring to Veterans Organizations.

Nonprofit501c24: Non-profit type referring to Section 4049 ERISA Trusts.

Nonprofit501c25: Non-profit type referring to Real Property Title-Holding Corporations or Trusts with Multiple Parents.

Nonprofit501c26: Non-profit type referring to State-Sponsored Organizations Providing Health Coverage for High-Risk Individuals.

Nonprofit501c27: Non-profit type referring to State-Sponsored Workers' Compensation Reinsurance Organizations.

Nonprofit501c28: Non-profit type referring to National Railroad Retirement Investment Trusts.

Nonprofit501c3: Non-profit type referring to Religious, Educational, Charitable, Scientific, Literary, Testing for Public Safety, Fostering National or International Amateur Sports Competition, or Prevention of Cruelty to Children or Animals Organizations.

Nonprofit501c4: Non-profit type referring to Civic Leagues, Social Welfare Organizations, and Local Associations of Employees.

Nonprofit501c5: Non-profit type referring to Labor, Agricultural and Horticultural Organizations.

Nonprofit501c6: Non-profit type referring to Business Leagues, Chambers of Commerce, Real Estate Boards.

Nonprofit501c7: Non-profit type referring to Social and Recreational Clubs.

Nonprofit501c8: Non-profit type referring to Fraternal Beneficiary Societies and Associations.

Nonprofit501c9: Non-profit type referring to Voluntary Employee Beneficiary Associations.

Nonprofit501d: Non-profit type referring to Religious and Apostolic Associations.

Nonprofit501e: Non-profit type referring to Cooperative Hospital Service Organizations.

Nonprofit501f: Non-profit type referring to Cooperative Service Organizations.

Nonprofit501k: Non-profit type referring to Child Care Organizations.

Nonprofit501n: Non-profit type referring to Charitable Risk Pools.

Nonprofit501q: Non-profit type referring to Credit Counseling Organizations.

Nonprofit527: Non-profit type referring to political organizations.