COVID-19 highlighted the challenge of connecting patients with accurate information regarding the COVID-19 vaccine. Upon seeing large disparities in vaccination rates among different populations in Sacramento, we began incorporating behavioral nudges into our digital messages to deliver information on the vaccine. To evaluate if these nudges could reduce vaccine disparities in our community, we leveraged UCD EMR data from Epic to identify populations with low vaccination rates, developed tailored messaging trees to those populations, and deployed messaging campaigns that were constantly iterated with A/B testing.