The City of Chicago's Data Portal is dedicated to promoting access to government data and encouraging the development of creative tools to engage and serve Chicago's diverse community.
New York City Open Data makes the wealth of public data generated by various New York City agencies and other City organizations available for public use. As part of an initiative to improve the accessibility, transparency, and accountability of City government, this catalog offers access to a repository of government-produced, machine-readable data sets.
Probably the most open data sets come from the United States of America. The number of open data sets is steadily growing to almost half a million different data sets.
