Boundaries and Borders
Provides city- and census tract-level small area estimates for chronic disease risk factors, health outcomes, and clinical preventive service use for the largest 500 cities in the United States.
Includes an interactive map and data portal.
Provides maps and spatial data for all countries and their sub-divisions, including over 300,000 administrative areas in vector format.
The world's largest open, free and research-ready database of political administrative boundaries.
Using collaboration, common data, services, applications and shared infrastructure to address national and regional issues and priorities (The Federal Geographic Data Committee).
Esri shapefile for the major continent boundaries provided from the Archival Policies and Collections Database for the Woods Hole Science Center's Marine Sediment Samples: U.S. Geological Survey Open-File Report 2006-1187, version 1.0 ([Buczkowski & Kelsey, 2007](http://pubs.usgs.gov/of/2006/1187/)).
GIS data download and visualization services provided by the U.S. Geological Survey.
TIGER/Line Shapefiles (United States)
The core TIGER/Line Files and Shapefiles do not include demographic data, but they do contain geographic codes (GEOIDs) that can be linked to the Census Bureau's demographic data.