Zipcodes_Poly

View metadata for key information about this dataset. Zip Code Tabulation Areas were developed by the US Census Bureau to overcome difficulties in precisely defining the land area covered by each Zip Code. The ZCTAs are generalized area representation of the USPS Zip code service areas, but are not the same as Zip codes. There is no correlation between ZIP codes and Census Bureau geography. In addition, the USPS frequently realigns, merges or splits ZIP codes to meet changing needs. ZCTAs are constructed by aggregating the Census 2000 blocks whose addresses use a given ZIP code. The census bureau took the ZIP code used by the majority of addresses in each census unit at the time the data was compiled. As a result, some addresses end up with a ZCTA code that is different from their ZIP code. This Zip code polygon layer has an accompanying arc layer. For questions about this dataset, contact [e-mail]. For technical assistance, email [e-mail].您可通过元数据获取本数据集的关键信息。邮政编码统计区域（Zip Code Tabulation Areas, ZCTA）由美国人口普查局开发，以解决精准界定各邮政编码覆盖陆地区域的难题。ZCTA是美国邮政（United States Postal Service, USPS）邮政编码服务区域的泛化区域表示，但与邮政编码并不等同。邮政编码与人口普查局的地理分区之间不存在关联。此外，美国邮政会为适配不断变化的业务需求，时常对邮政编码进行调整、合并或拆分。ZCTA通过聚合地址使用指定邮政编码的2000年人口普查区块构建而成。在数据编制阶段，人口普查局会选取每个普查单元内多数地址所使用的邮政编码作为对应ZCTA的编码。因此，部分地址对应的ZCTA编码与其实际邮政编码并不一致。本邮政编码面图层配套有弧线段图层。若您对本数据集有疑问，请联系[e-mail]；如需技术支持，请发送邮件至[e-mail]。