INSURED MUNICIPALS INCOME TRUST 231ST INSURED MULTI SERIES, 497, 1998-06-04

INSURED MUNICIPALS INCOME TRUST 231ST INSURED MULTI SERIES
497, 1998-06-04

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                                  June 3, 1998





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

Attn:  Filing Desk, Stop 1-4

         Re: Insured Municipals Income Trust, 231st Insured Multi-Series
                      (File No. 333-45169) (CIK No. 896377)


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 registration statement of 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. Amendment No. 1 to the
registration statement, which was the most recent amendment to the registration
statement, was filed electronically with the Commission on May 29, 1998.


                        Very truly yours,



                        VAN KAMPEN AMERICAN CAPITAL DISTRIBUTORS, INC.