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Our catalog of 3-Digit ZIP Code Prefix Boundary Reference Maps shows all of the 3-digit ZIP Code regions in each of the 50 United States.
Oregon 3-Digit ZIP Code Prefix Boundary Map (Uncolored ZIP3s, Borders Only) :: MapTechnica ZIP3 Series
A map of Oregon showing the borders of regions containing ZIP codes starting with the same 3-digit prefix (e.g. 123xx). This 11"×8.5" map can be printed as a handout or used as a reference map.