8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported) April 28, 2005

MARKWEST HYDROCARBON, INC.

(Exact name of registrant as specified in its charter)

Delaware	001-14841	84-1352233
(State or other jurisdiction of incorporation or organization)	(Commission File Number)	(I.R.S. Employer Identification Number)
155 Inverness Drive West, Suite 200, Englewood, CO 80112-5000
(Address of principal executive offices)

Registrant’s telephone number, including area code: 303-290-8700

Not Applicable.

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

oWritten Communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

oSoliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

oPre-Commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

oPre-Commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01. Other Events

On April 28, 2005, MarkWest Hydrocarbon, Inc. publicly disseminated a press release announcing that its Board of Directors had declared a cash dividend in the amount of $0.10 per share, payable on May 23, 2005, to the stockholders of record on May 16, 2005.  A copy of the press release is filed as Exhibit 99.1 to this report.

Item 9.01. Financial Statement and Exhibits

(c)Exhibits.

Exhibit No.	Description of Exhibit
99.1	Press Release Dated April 28, 2005 announcing first quarter dividend.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	MARKWEST HYDROCARBON, INC.
	(Registrant)
Dated: May 4, 2005	By:	/s/ JAMES G. IVEY
		James G. Ivey
		Chief Financial Officer

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Exhibit Index

99.1 Press Release Dated April 28, 2005 announcing first quarter dividend.

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EX-99.1

EXHIBIT 99.1

MarkWest Hydrocarbon, Inc.	Contact:	Frank Semple, President & CEO
155 Inverness Drive West, Suite 200		Jim Ivey, CFO
Englewood, CO 80112-5000		Andy Schroeder, VP and Treasurer
(800) 730-8388	Phone:	(303) 290-8700
(303) 290-8700	E-mail:	investorrelations@markwest.com
(303) 290-8769 Fax	Website:	www.markwest.com

MARKWEST HYDROCARBON DECLARES A QUARTERLY
CASH DIVIDEND OF $0.10 PER SHARE

DENVER—April 28, 2005 — MarkWest Hydrocarbon, Inc. (AMEX: MWP), today announced that on April 28, 2005 its Board of Directors declared a quarterly cash dividend of $0.10 per share of its common stock for an implied annual rate of $0.40 per share.  This quarterly cash dividend represents an increase of $0.025 per share over the previous quarter dividend.  MarkWest’s Board has declared that the dividend is to be paid on May 23, 2005, to the stockholders of record as of the close of business on May 16, 2005.  The ex-dividend date is May 12, 2005.

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MarkWest Hydrocarbon, Inc. (AMEX: MWP) controls and operates MarkWest Energy Partners, L.P. (AMEX: MWE), a publicly-traded limited partnership engaged in the gathering, processing and transmission of natural gas; the transportation, fractionation and storage of natural gas liquids; and the gathering and transportation of crude oil. We also market natural gas and NGLs.

This press release includes “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. All statements other than statements of historical facts included or incorporated herein may constitute forward-looking statements. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we can give no assurance that such expectations will prove to be correct. The forward-looking statements involve risks and uncertainties that affect our operations, financial performance and other factors as discussed in our filings with the Securities and Exchange Commission. Among the factors that could cause results to differ materially are those risks discussed in our Form 10-K for the year ended December 31, 2003, and our Forms 10-Q, as filed with the SEC.