Animations showing the population of every U.S. county from the 18th century until now

Len Keifer created a series of visualizations that depict the relentless growth and westward expansion of the U.S. Census Bureau. Read the rest

Mailifest Destiny: U.S. expansion visualized as post offices

Derek Watkins created a visualization tracking the spatial distribution of U.S. postal offices from the 18th to the 20th century. Gathering data from the USPS Postmaster Finder, with lat/long coordinates extracted from the USGS Geographic Names Information System, the results were animated using Processing. [Thanks, MR!] Read the rest