SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549


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                                  SCHEDULE 13G
                                 (RULE 13D-102)


             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
           TO RULES 13D-1(B) (C), AND (D) AND AMENDMENTS THERETO FILED
                            PURSUANT TO RULE 13D-2(B)
                                 AMENDMENT NO. 3


                       MEDIACOM COMMUNICATIONS CORPORATION
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                                (Name of Issuer)


                              CLASS A COMMON STOCK
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                         (Title of Class of Securities)


                                   58446K 10 5
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                                 (CUSIP Number)


                                DECEMBER 31, 2004
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             (Date of Event Which Requires Filing of this Statement)


Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

         |_|    Rule 13d-1(b)
         |_|    Rule 13d-1(c)
         |X|    Rule 13d-1(d)

- ------------------- ----------------- CUSIP No. 58446K105 13G Page 2 of 7 Pages - ------------------- ----------------- ========= ====================================================================== 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY). ---------------------------------------------------------------------- Rocco B. Commisso - --------- ---------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) |X| - --------- ---------------------------------------------------------------------- 3 SEC USE ONLY - --------- ---------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION USA - -------------------- ----- ----------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 38,149 shares - Class A (one vote per share)* BENEFICIALLY 28,435,831 shares - Class B (ten votes per share)* OWNED BY ----- ----------------------------------------------------- EACH 6 SHARED VOTING POWER 0 REPORTING ----- ----------------------------------------------------- PERSON WITH 7 SOLE DISPOSITIVE POWER 38,149 shares - Class A 27,888,614 shares - Class B ----- ----------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 - --------- ---------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 38,149 shares - Class A 28,435,831 shares - Class B - --------- ---------------------------------------------------------------------- 10 CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - --------- ---------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 75.9% of aggregate voting power - --------- ---------------------------------------------------------------------- 12 Type of Reporting Person* IN ========= ====================================================================== - ------------- * Reference is made to the disclosure in Item 4 of this Schedule 13G

- ------------------- ----------------- CUSIP No. 58446K105 13G Page 3 of 7 Pages - ------------------- ----------------- ITEM 1(a). NAME OF ISSUER: Mediacom Communications Corporation ------------------------------------------------------------ ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: 100 Crystal Run Road, Middletown, NY 10941 ------------------------------------------------------------ ITEM 2(a). NAME OF PERSON FILING: Rocco B. Commisso ------------------------------------------------------------ ITEM 2(b). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE: 100 Crystal Run Road, Middletown, NY 10941 ------------------------------------------------------------ ITEM 2(c). CITIZENSHIP: USA ------------------------------------------------------------ ITEM 2(d). TITLE OF CLASS OF SECURITIES: Class A Common Stock ------------------------------------------------------------ ITEM 2(e). CUSIP NUMBER: 58446K 10 5 ------------------------------------------------------------

- ------------------- ----------------- CUSIP No. 58446K105 13G Page 4 of 7 Pages - ------------------- ----------------- ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULE 13D-1(B), OR 13D-2(B) OR (C), CHECK WHETHER THE PERSON FILING IS A: (a) |_| Broker or dealer registered under Section 15 of the Exchange Act. (b) |_| Bank as defined in Section 3(a)(6) of the Exchange Act. (c) |_| Insurance company as defined in Section 3(a)(19) of the Exchange Act. (d) |_| Investment company registered under Section 8 of the Investment Company Act. (e) |_| An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E); (f) |_| An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F); (g) |_| A parent holding company or control person in accordance with Rule 13d-1(b)(ii)(G); (h) |_| A savings association as defined in Section 3(b) of Federal Deposit Insurance Act; (i) |_| A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act; (j) |_| Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

- ------------------- ----------------- CUSIP No. 58446K105 13G Page 5 of 7 Pages - ------------------- ----------------- ITEM 4. OWNERSHIP. (a) Amount beneficially owned: 38,149 shares of Class A common stock * 28,435,831 shares of Class B common stock ** (b) Percent of class: 75.9% of aggregate voting power (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: 38,149 shares of Class A common stock * 28,435,831 shares of Class B common stock ** (ii) Shared power to vote or to direct the vote: 0 (iii) Sole power to dispose or to direct the disposition of: 38,149 shares of Class A common stock * 27,888,614 shares of Class B common stock *** (iv) Shared power to dispose or to direct the disposition of: 0 * Consists of 38,149 shares of Class A common stock issuable, as of February 10, 2005, upon the exercise of outstanding options. ** Each share of Class B common stock is convertible into one share of Class A common stock. Includes 547,217 shares of Class B common stock owned of record by other stockholders, for which Mr. Commisso holds an irrevocable proxy, representing all remaining shares of Class B common stock outstanding. Also includes 1,098,892 shares of Class B common stock issuable, as of February 10, 2005, upon the exercise of outstanding options. Excludes 7,133,870 shares of Class B common stock issuable upon the exercise of options which expired on February 10, 2005. *** Each share of Class B common stock is convertible into one share of Class A common stock. Includes 1,098,892 shares of Class B common stock issuable, as of February 10, 2005, upon the exercise of outstanding options. Excludes 6,855,669 shares of Class B common stock issuable upon the exercise of options which expired on February 10, 2005.

- ------------------- ----------------- CUSIP No. 58446K105 13G Page 6 of 7 Pages - ------------------- ----------------- ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS. If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [ ]. ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON. Not Applicable. ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY. Not Applicable. ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP. Not Applicable. ITEM 9. NOTICE OF DISSOLUTION OF GROUP. Not Applicable. ITEM 10. CERTIFICATION. Not Applicable.

SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. February 11, 2005 ------------------------------------ (Date) /s/ Rocco B. Commisso ------------------------------------ Rocco B. Commisso