Table 1. Number of HMOs: 1990.

Commercial Market Area	All HMOs	Medicare Risk Plan Market Area			No Medicare Risk Plan
		Urban	Urban/Rural	Rural
Total	592	76	17	1	498
Urban	280	55	—	—	225
Urban/Rural	301	21	17	—	263
Rural	11	—	—	1	10

NOTE: HMO is health maintenance organization.

SOURCES: (Group Health Association of America, 1990); Health Care Financing Administration: Group Health Programs Office enrollment files, 1990.