Enter this formula in cell below your list of names.

=SUBTOTAL(3,range) where range is your range of names including
duplicates.

Use Advanced Filter to return just the unique names filtered in place.

The subtotal will count filtered names.


Gord Dibben MS Excel MVP


On Wed, 13 Jan 2010 12:57:10 -0800, Brenda
wrote:

My staff use Excel to keep a database of people who come to us for service.
Every 90 days the person can use our service again. At the end of the year I
want to know how many people (unduplicated) used our service. How do I do
that?
Thank you.