Try this:
Put the 25 zip codes in a vertical list on another sheet in the workbook.
Name that list:
Select the 25 cells, then
In the Name box (Just above the Col_A heading) enter: LU_ZipList
Press [Enter]

Now, select an input cell (I'll use A2)
FormatConditional Formatting
Select: "Formula Is" from the dropdown
Formula: =ISNUMBER(MATCH(A2,LU_ZipList,0))
(Note: No dollar signs in the A2 reference)

Click the [Format] button and set the display to show for zips on the list
Click the [OK] button

Now copy A2 down as far as you need.

When you enter a Zip Code that is on the list....your conditional format
will display.

Does that help?

***********
Regards,
Ron


"M.A." wrote:

I am working with zip codes and when certain (around 25) zipcodes are
entered, I need for the format of the cell to change colors. How can I go
about doing this?