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ZIP Code Tabulation Areas (ZCTAs) Delineation Animation

The animation below explains how we used census blocks to create the 2010 ZIP Code Tabulation Areas (ZCTAs). Please use the "Play" button on the bottom right to start the animation.

Median Center of Population for the United States 1880-2000 Animation
Source: U.S. Census Bureau | Geography | (301) 763-1128 |  Last Revised: December 11, 2013