We study how a suburban U.S. district in the early stages of demographic change developed systems of support for teachers of English learners (ELs). Using district- and school-level social network and interview data, we examine elementary teachers' EL-related professional learning opportunities, and how district and school organizational contexts enabled or constrained these opportunities. We find that the separation of language and content at the district level limited teachers' learning opportunities, yet school leaders mitigated this separation by implementing structures that fostered norms of shared responsibility and collaborative teaching. Findings highlight the relevance of an organizational perspective for understanding how suburban districts respond to demographic change, and have implications for policymakers and practitioners with respect to creating inclusive environments for ELs.