Dead letter mail or undeliverable mail is mail that cannot be delivered to the addressee or returned to the sender.ith increased collection and study of the postal markings originating from such offices, the body of literature on this obscure topic may grow. Many countries, including Canada and the United States, have issued special labels for envelopes that have travelled through the dead letter office.
For other uses, see Memphis (disambiguation). Memphis is a city in the southwestern corner of the U.S. state of Tennessee and the county seat of Shelby County. The city is located on the fourth Chickasaw Bluff, south of the confluence of the Wolf and Mississippi rivers. Memphis had a population of 653,450 in 2013, making it the largest city in the state of Tennessee.
The most recent Census Estimate <1> was for 2016 and it gives Memphis a population of 652,717 people. The last Decennial Census <2> was in 2010, giving Memphis a population of 646,889 people. The city of Memphis is located in Shelby County. The 2010 Census gave Shelby County a population of 927,644 people. This means that Memphis had 69.7% of the county's total population, making it Shelby's most populous community. At the same time, Tennessee had a population of 6,346,105 people, meaning that Memphis had 10.19% of the total population of Tennessee - making it the state's most populous community.