Romy Misra has posted a list of thirty places to find open data on the web. Misra notes, "Finding an interesting data set and a story it tells can be the most difficult part of producing an infographic or data visualization. Data visualization is the end artifact, but it involves multiple steps – finding reliable data, getting the data in the right format, cleaning it up (an often underestimated step in the amount of time it takes!) and then finding the story you will eventually visualize. Following is a list useful resources for finding data. Your needs will vary from one project to another, but this list is a great place to start — and bookmark."
Misra starts the list with a few government and political data resources: "Data.gov: This is the go-to resource for government-related data. It claims to have up to 400,000 data sets, both raw data and geo spatial, in a variety of formats. The only caveat in using the data sets is you have to make sure you clean them, since many have missing values and characters. Socrata is another good place to explore government-related data. One great thing about Socrata is they have some visualization tools that make exploring the data easier."
Image: Courtesy Flickr/ schoschie