Exhibit 23 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation of our report included in an exhibit in this Form 10-K, into Trustmark Corporation's previously filed Registration Statements on Forms S-8 (File Numbers 333-35889 and 333-07141). /s/ Arthur Andersen LLP - ----------------------- Arthur Andersen LLP Jackson, Missisisppi, March 24, 2000.