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Download zip code database usps
The census conducted every 10 years by the Census Bureau is the only population estimate that makes an attempt to count every member of the population by sending a survey to every household in the country. Some additonal placenames for decommisioned codes. This means that you can determine what percentage of the population of a ZIP code is located within various city limits without complex analysis of tons of addresses, shapes, or areas. USA USPS Zip Code Database v.1.2 Article
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