Boston Zoning Code is established.

Gov. Channing H. Cox signs a law that makes Boston the last municipality in the state with the authority adopt its own zoning code, but the law gives Boston little authority in its creation. Subsequently developed by a newly-reestablished Boston Planning Board, it divides the city into single and general residential districts, local and general business districts, and industrial and unrestricted districts, each with height, setback, occupancy, and rear yard provisions. New zoning regulations are adopted in 1963, and the code is amended numerous times since then. It currently contains 3,791 pages, and is reputedly the largest of any city in the U.S.