USPS Collection Box, 10909 W Greenfield Ave, Milwaukee, WI 53214, US

According to the website:Located in West Allis, WI, the USPS is responsible for the delivery of mail and other forms of communication throughout the United States. It is one of the few government agencies explicitly authorized by the United States Constitution. It plays a vital role in the country's infrastructure and communications network, assuring the safe and efficient delivery of letters and packages, providing customers with postal products and services, and supporting economic development in communities throughout the United States.

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