Health systems in San Mateo County ranked third out of 306 regions nationwide, according to a 2016 interactive report by the Commonwealth Fund, a foundation funding health research.
In first and second places, respectively, were Honolulu, Hawaii, and St. Paul, Minnesota.
The report ranked locations based on performance in five categories: overall performance, healthcare access, prevention and treatment, avoidable hospital use and healthy lives.
San Mateo County scored second in the healthy lives category, which tracks indicators such as infant mortality, breast and colorectal cancer death rates, and adult smoking and obesity rates.
San Mateo County scored 68th in the access category, which compares the numbers of adults and children who are uninsured, or adults who went without medical care because of cost.
Nearby areas that were studied, San Francisco and San Jose, tied for seventh place in overall performance.