This study documents the cultural landscape at Picatinny Arsenal, focusing on five existing historic districts. This work looks at the historic development and discusses the existing conditions within each of the five districts. It analyzes the features within each district for their historic significance and integrity, and based on this analysis, makes treatment recommendations. This document meets the requirements for federal agencies to address their cultural resources which are defined as any prehistoric or historic district, site, building, structure, or object. Especially relevant is Section 110 of the National Historic Preservation Act, which requires federal agencies to inventory and evaluate their cultural resources.