VAN KAMPEN FOCUS PORTFOLIOS SERIES 166, 497J, 2000-10-30

VAN KAMPEN FOCUS PORTFOLIOS SERIES 166
497J, 2000-10-30

Previous: VAN KAMPEN FOCUS PORTFOLIOS SERIES 163, 497J, 2000-10-30

Next: OPTION ONE MORTGAGE ACCEPTANCE CORP, 424B5, 2000-10-30



                            October 30, 2000



Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C.  20549-1004

Attn:  Filing Desk - Stop 1-4

     Re:  Van Kampen Focus Portfolios Trust, Series 166
          File No. 333-81671    CIK #1025318

Ladies/Gentlemen:

         In accordance with the provisions of Rule 497(j) of Regulation C under
the Securities Act of 1933 (the "Securities Act") this letter serves to certify
that the most recent amendment to the Post-Effective of the subject Registration
Statement on Form S-6 for the above captioned Trust does not differ from that
which would have been filed pursuant to Rule 497(b) of the Securities Act. The
most recent amendment to the Registration Statement was filed electronically
with the commission on October 25, 2000.

                                    Very truly yours,




                                    Van Kampen Funds Inc.