<PAGE>
                                                                  Exhibit 31

                    CHIEF EXECUTIVE OFFICER CERTIFICATION

I, John W. Bachmann, certify that:

1.     I have reviewed this quarterly report on Form 10-Q of The Jones
       Financial Companies, L.L.L.P.

2.     Based on my knowledge, this quarterly report does not contain any
       untrue statement of a material fact or omit to state a material fact
       necessary in order to make the statements made, in light of the
       circumstances under which such statements were made, not misleading
       with respect to the period covered by this quarterly report.

3.     Based on my knowledge, the financial statements, and other financial
       information included in this quarterly report, fairly present in all
       material respects the financial condition and results of operations
       and cash flows of the Partnership as of, and for, the periods
       presented in this quarterly report.

4.     The Partnership's other certifying officer and I are responsible for
       establishing and maintaining disclosure controls and procedures (as
       defined in Exchange Act Rules 13a-14 and 15d-14) for the Partnership
       and have;

       a)  designed such disclosure controls and procedures to ensure that
           material information relating to the Partnership including its
           consolidated subsidiaries, is made known to us by others within
           those entities, particularly during the period in which this
           quarterly report is prepared;
       b)  evaluated the effectiveness of the Partnership's disclosure
           controls and procedures as of a date within 90 days prior to the
           filing date of this quarterly report (the "Evaluation Date"); and
       c)  presented in this quarterly report our conclusions about the
           effectiveness of our disclosure controls and procedures based on
           our evaluation as of the Evaluation Date.

5.     The Partnership's other certifying officer and I have disclosed,
       based on our most recent evaluation, to the Partnership's auditors
       and the Executive Committee:

       a)  all significant deficiencies in the design or operation of
           internal controls which could adversely affect the Partnership's
           ability to record, process, summarize, and report financial data
           and have identified for the Partnership's auditors any material
           weaknesses in internal controls; and
       b)  any fraud, whether or not material, that involves management or
           other associates who have a significant role in the Partnership's
           internal controls.

6.     The Partnership's other certifying officer and I have indicated in
       this quarterly report whether or not there were significant changes
       in internal controls or in other factors that could significantly
       affect internal controls subsequent to the date of our most recent
       evaluation, including any corrective actions with regard to
       significant deficiencies and material weaknesses.


                                    /s/ John W. Bachmann
                                    -----------------------------------------
                                    Chief Executive Officer
                                    The Jones Financial Companies, L.L.L.P.
                                    August 8, 2003


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<PAGE>
                                                                  Exhibit 31

                    CHIEF FINANCIAL OFFICER CERTIFICATION

I, Steven Novik, certify that:

1.     I have reviewed this quarterly report on Form 10-Q of The Jones
       Financial Companies, L.L.L.P.

2.     Based on my knowledge, this quarterly report does not contain any
       untrue statement of a material fact or omit to state a material fact
       necessary in order to make the statements made, in light of the
       circumstances under which such statements were made, not misleading
       with respect to the period covered by this quarterly report.

3.     Based on my knowledge, the financial statements, and other financial
       information included in this quarterly report, fairly present in all
       material respects the financial condition and results of operations
       and cash flows of the Partnership as of, and for, the periods
       presented in this quarterly report.

4.     The Partnership's other certifying officer and I are responsible for
       establishing and maintaining disclosure controls and procedures (as
       defined in Exchange Act Rules 13a-14 and 15d-14) for the Partnership
       and have;

       a)  designed such disclosure controls and procedures to ensure that
           material information relating to the Partnership including its
           consolidated subsidiaries, is made known to us by others within
           those entities, particularly during the period in which this
           quarterly report is prepared;
       b)  evaluated the effectiveness of the Partnership's disclosure
           controls and procedures as of a date within 90 days prior to the
           filing date of this quarterly report (the "Evaluation Date"); and
       c)  presented in this quarterly report our conclusions about the
           effectiveness of our disclosure controls and procedures based on
           our evaluation as of the Evaluation Date.

5.     The Partnership's other certifying officer and I have disclosed,
       based on our most recent evaluation, to the Partnership's auditors
       and the Executive Committee:

       a)  all significant deficiencies in the design or operation of
           internal controls which could adversely affect the Partnership's
           ability to record, process, summarize, and report financial data
           and have identified for the Partnership's auditors any material
           weaknesses in internal controls; and
       b)  any fraud, whether or not material, that involves management or
           other associates who have a significant role in the Partnership's
           internal controls.

6.     The Partnership's other certifying officer and I have indicated in
       this quarterly report whether or not there were significant changes
       in internal controls or in other factors that could significantly
       affect internal controls subsequent to the date of our most recent
       evaluation, including any corrective actions with regard to
       significant deficiencies and material weaknesses.


                                    /s/ Steven Novik
                                    -----------------------------------------
                                    Steven Novik
                                    Chief Financial Officer
                                    The Jones Financial Companies, L.L.L.P.
                                    August 8, 2003