The county has also released the results of a survey taken between June 13 and June 24.
Residents who say they were unlikely to get vaccinated were most concerned about potential side effects. Another concern was that vaccine development was rushed, according to the survey.
NBC 7's Artie Ojeda spoke to San Diegans about their feelings toward the COVID-19 vaccine.
The county identified three focus areas based on the survey, including the 140,000 people who are overdue for their second shots.
The county will also focus on residents who are hesitant to get the vaccine because they feel they don’t have enough trusted information and those who are vaccine-resistant.