Did you know East Palo Alto and Half Moon Bay have 60% or more of adults with a high school diploma or less, the highest in San Mateo County. The majority of cities in San Mateo County have 50% or fewer adults with a high school diploma or less. Educational attainment is the highest level of education a person completes. People who are highly educated tend to be healthier and live longer. How can we improve these numbers in San Mateo County?