Some of these usages are so common that we don’t even notice they are redundant.
The meeting is Monday morning at 9:00 a.m. (“morning” is implied by “a.m.”)
Our headquarters are located in Memphis, TN. (In this case “in” means “located.”)
I received purchase order number 1784362. (The number is obvious.)
The GAO office is in Washington D.C. (“GAO” stands for “Government Accountability Office.”)
Please give me your account identification number. (The number identifies the account.)