UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Notice of Effectiveness
Effectiveness Date:	April 28, 2008 4:00 P.M.

Form:	S-3
CIK: 0000928022 Company Name: CALLON PETROLEUM CO File Number: 333-148680
CIK: 0001293651 Company Name: Callon Petroleum Operating CO File Number: 333-148680-03
CIK: 0001293829 Company Name: Mississippi Marketing, Inc. File Number: 333-148680-02
CIK: 0001293656 Company Name: Callon Offshore Production, Inc. File Number: 333-148680-01