Baltimore County GovernmentCensus blocks, the smallest geographic area for which the Bureau of the Census collects and tabulates decennial census data, are formed by streets, roads, railroads, streams and other bodies of water, other visible physical and cultural features, and the legal boundaries shown on Census Bureau maps.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/02da3e78244c4c09bef922a6fe31291d_1engBaltimore County Open Data PortalPublicCensus Blocks 2010 [Maryland--Baltimore County]Web servicesMaryland--Baltimore CountyMaryland2010