The COVID-19 vaccination is now widely available for children aged 5 and older, and has been shown to be both safe and effective at preventing serious health outcomes from COVID-19. However, most children in the United States are not vaccinated. In order for public health to identify sub-groups to target immunization campaigns and other efforts towards, they need to know who to target. To this end, we seek to determine what community-level characteristics predict underimmunization in children. Potential important factors include social, economic, and demographic characteristics, and it is these we will primarily explore. Our findings will be published in a peer-reviewed journal alongside an interactive website that provides graphics to better understand these trends.