Zip Code

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.本数据集涵盖俄亥俄州特拉华县（Delaware County）境内的全部邮政编码（zip code）区域。2003年，研究团队依托2000年人口普查的美国人口普查局（Census Bureau）邮政编码文件、美国邮政署（United States Postal Service）官网数据，以及该县财务主管办公室的税务邮寄地址，对特拉华县的邮政编码区域开展了严谨的评估与数据清理工作。2005年，研究人员通过按物业地址融合特拉华县所有地籍地块（parcels），生成了该邮政编码图层（zip code layer）。针对无邮政编码的免税地籍地块与专用道路，研究人员基于其在邮政编码图层中的空间位置，通过人工方式补全了其邮政编码信息。该图层还被用于为特拉华县的道路中心线（road centerline）补全zip_right与zip_left属性字段。