Widespread vaccination is the most promising way to control the coronavirus disease 2019 (COVID-19) pandemic. Unfortunately, U.S. vaccination rates have stagnated. The rates are particularly low among racial/ethnic minority groups1 and rural residents.2 Although much of the discussion about low vaccination centers on person-level factors, the role of healthcare system factors is not well understood. An important system factor is the availability of primary care physicians, who play an integral role in counseling patients regarding the risks and benefits of vaccination.