This data set contains all zip codes within Delaware County, Ohio. In 2003, Delaware County zip codes were carefully evaluated and cleaned-up based on cross referencing between the Census Bureau's zip code file from the 2000 census, the United States Postal Service website, and tax mailing addresses from the treasurer's office. The zip code layer was then created in 2005 by dissolving all Delaware County parcels by their property addresses. Tax exempt parcels and dedicated roads with no zip codes were manually populated based on their location within the zip code layer. This layer was also used to populate the zip_right and zip_left attributes for Delaware County's road centerline.
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