| MSA | Number of HMOs |
|---|---|
| Atlanta, GA | 15 |
| Baltimore, MD | 12 |
| Boston, MA | 12 |
| Chicago, IL | 26 |
| Cleveland-Lorain-Elyria, OH | 17 |
| Dallas, TX | 18 |
| Detroit, MI | 16 |
| Houston, TX | 18 |
| Los Angeles-Long Beach, CA | 20 |
| Miami, FL | 17 |
| Minneapolis-St. Paul, MN | 10 |
| New York, NY | 19 |
| Orange County, CA | 17 |
| Philadelphia, PA | 19 |
| Phoenix-Mesa, AZ | 11 |
| Pittsburgh, PA | 8 |
| San Diego, CA | 12 |
| San Francisco, CA | 17 |
| St. Louis, MO | 12 |
| Washington, DC | 15 |
Source: Interstudy MSA Profiles, 1998