Atlas of Historical County Boundaries

Wondering how the boundary of Los Angeles County looked like in 1851?  Here you go:

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Here it is in 1887, just before Orange County was created the year after:

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The Atlas of Historical County Boundaries allows you to explore how county boundaries have shifted throughout history.  You can also download GIS shapefiles of polygons for each different configuration of a state’s counties or the entire United States, coded by date.  Check it out!

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