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Significant Changes to Counties and County Equivalents: 1970 to Present

a PSC Data Resource

Resource Source:Census Bureau


This Web page contains substantial county changes only. This includes all county boundary changes affecting at least an estimated population of 200 plus with additional changes of at least one square mile where no estimated population was provided and research indicated that the affected population may have been 200 people or more or "large" annexations of unpopulated territory (10 square miles or more.)


Boundary Changes (Source: Census Bureau)

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