"Map of the United States, Territory of Oregon"

Location: Header of Historic Population

Source: Library of Congress, Geography and Map Division

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Historic County Boundary Shapefiles

Location: Historic Population map

Source: Atlas of Historical County Boundaries, The Newberry Library

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Historic Census Data

Steven Manson, Jonathan Schroeder, David Van Riper, and Steven Ruggles. IPUMS National Historical Geographic Information System: Version 12.0. Minneapolis: University of Minnesota. 2017.

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Relic - Mapbox Style

This is an original style of mine called Relic based on Mapbox's Outdoors Style.