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Statistics collected by the Census Department:
American Community Survey
American Housing Survey
Annual Surveys of Governments
Census of Governments
Annual Economic Surveys
Equal Employment Opportunity (EEO) Tabulation
Population Estimates Program
Puerto Rico Community Survey
Earth Resources Observation Systems (EROS) Data Center (EDC)
The Earth Resources Observation Systems (EROS) Data Center (EDC) is a data management, systems development, and research field center for the U.S. Geological Survey's (USGS) National Mapping Division.
Earth Resources Observation Systems (EROS) Data Center (EDC): Distributed Active Archive Center
Archives the world's largest collection of civilian remotely sensed data covering the Earth's land masses.
ESRI Support Center Home
This should be one of your first resources when stuck on an ArcGIS task or looking for a specialized tool for geoprocessing.
ESRI's search portal for spatial data
Global Change Data and Information System
Gateway to global change data and information by U.S. Federal agencies, 1987 -
LandScan - Gridded Global Population
This dataset is a 30x30 arc-second (approximately 1 km) gridded population of the world. You must request access to it through the creators, the Oak Ridge National Laboratory's Geographic Information Science & Technology section.
National Geophysical Data Center (NGDC) - Interactive Map Services
Here you can find links to the web mapping services for many of the NGDC datasets such as ecosystems, hazards, marine info, paleoclimate, satellite, snow and ice, thermal springs and more.
National Historical Geographic Information System (NHGIS)
Excellent free resource for downloadable historical Census data and GIS data. Requires registration to use but is very simple and of good quality.
SANDAG Data Warehouse (SD Govt.)
Economic, demographic, and land use data and estimates for San Diego County from 1950 to 2020, as well as subregional estimates and forecasts every five years from 1990 to 2020, for San Diego cities.
SimplyAnalytics is a web-based mapping application that lets users quickly create professional-quality thematic maps and reports using demographic, business, and marketing data for the United States. Access limited to 5 simultaneous users. Try again later if refused. (formerly known as SimplyMap).
1790-present. This site combines data from the U.S. Census of Population and Housing & the American Community Survey (ACS) with a user friendly interface, allowing the creation of maps & statistical tables. Census Tract boundaries are available back to 1940.