How do I find the routing number i used in Turbotax? I filed return and haven't received refund, but IRS says it was sent. Thanks in advance

If you had the refund going directly to your account then look at page 2 of the form 1040 towards the bottom for the DD information.

Your post indicates that you are using the CD/Download/Desktop version of turbotax. Start Turbotax, open your tax return, then click on the Forms icon in the upper right of your screen.
In the forms list that opens on the left, select and click on Form 1040.
In the Form 1040, scroll down to line 76 on page 2. You will see "routing number" and both the routing number and the account number will be all "x". Right click on the routing number field, then in the popup menu that opens, click on Data Source. Then you will get another popup which shows the routing number and the account number.