The Post Office by the numbers

235.2 million – revenue received in dollars
160.2 million – dollars paid to postal employees in salaries and benefits
506.4 million – number of mail pieces processed and delivered each day
21.1 million – average number of mail pieces processed each hour
351,656 – average number of mail pieces processed each minute
5,861 – average number of mail pieces processed each second
200.4 million – pieces of first-class mail processed and delivered
7,131 – number of letter carriers who deliver mail entirely on foot – The USPS Fleet of Feet
54,490 – number of address changes processed
3,748 – number of addresses added to delivery network
4.6 million – number of people who visit usps.com
2.7 million – dollar amount of online stamp and retail sales at usps.com
1.5 million – number of Click-N-Ship labels printed
297,004 – number of money orders issued
0 – tax dollars received for operating the Postal Service

https://about.usps.com/who-we-are/postal-facts/one-day-by-the-numbers.htm