Places (Cities are a census place)
A concentration of population; a place may or may not have legally prescribed limits, powers, or functions. This concentration of population must have a name, be locally recognized, and not be part of any other place.
Census Tract
A small, relatively permanent statistical subdivision of a county delineated by a local committee of census data users for the purpose of presenting data. These subdivisions — ideally containing 4,000 people and 1,600 housing units — nest within counties, and their boundaries normally follow visible geographic features.
Census Block Group
A statistical area that generally contains between 600 and 3,000 people and is used to present data.
Census Block
A statistical area bounded by visible geographic features, such as streets, roads, streams, and railroad tracks, and by nonvisible features, such as selected property lines; city, township, and county boundaries; and school districts. It is the smallest geographic unit for which the Census Bureau tabulates decennial census data.
Social Explorer provides quick and easy access to modern and historical socioeconomic and demographic data, bringing together quantitative data with a visual interface to make demographic research, the analysis of social trends, and comparison of neighborhoods, communities, counties, and other areas accessible and interactive.