Compared to previous generations, young adults today report lower levels of trust in government, law enforcement, and their communities. This study investigates neighborhood factors influencing social trust among Arizona young adults during the lead-up to the 2020 presidential election. Through an analysis of online survey data for a sample of young adults ( N = 1,376) who participated in the Arizona Youth Identity Project, we explore how neighborhood diversity, population density, racial identity, and political affiliation are associated with social trust and voting preferences. We find that Arizona young adults’ trust in police and their neighbors varies by neighborhood diversity and racial identity, with residents of mostly White neighborhoods reporting higher levels of trust. Additionally, support for Trump is highest among young adults who expressed high trust in local police. This study underscores and begins to unpack the interplay between race, space, and trust in shaping political identities and preferences.