This paper is part of the Initiative on Local Housing Regulation, a joint effort of the Pioneer Institute for Public Policy Research and Harvard University’s Rappaport Institute for Greater Boston. As part of this initiative, researchers at the Pioneer Institute and the Rappaport Institute have assembled and coded a database on zoning codes, subdivision requirements, and environmental regulations that as of 2004 governed land use in 187 communities in eastern and central Massachusetts. The searchable database is available at www.pioneerinst.wpengine.com/municipalregs/. The site also housing summary reports, analyses of the data, and a downloadable version in formats that can be used for economic analyses. In coming months, Pioneer Institute and the Rappaport Institute will also be issuing papers and policy briefs, some jointly and some individually, on land-use regulation in greater Boston.