Despite co‐offending being a core criminological fact, locating suitable peers has many challenges. Chief among these, given the risky nature of co‐offending, is finding trustworthy accomplices. We propose that neighborhoods serve as youths’ most ready source of accomplices, and as such, their composition affects the likelihood of identifying suitable co‐offenders. In particular, youth are more likely to co‐offend in contexts with more peers of their race/ethnicity, less disadvantage, and greater residential stability—all of which promote trust among neighbors. We test our hypotheses using multilevel models applied to census data and official court records for 7,484 delinquent youth in a large metropolitan area. The results offer support for our hypotheses and provide greater insight into how individual and contextual factors combine to affect co‐offending behavior. An implication of these findings is that many of the same neighborhood characteristics that reduce crime lead to a greater proportion of co‐offending.