<SEC-DOCUMENT>0000913414-05-000548-index.html : 20050214
<SEC-HEADER>0000913414-05-000548.hdr.sgml : 20050214
<ACCEPTANCE-DATETIME>20050214151649
ACCESSION NUMBER:		0000913414-05-000548
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20050214
DATE AS OF CHANGE:		20050214

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MERCK & CO INC
		CENTRAL INDEX KEY:			0000064978
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				221109110
		STATE OF INCORPORATION:			NJ
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-31146
		FILM NUMBER:		05608946

	BUSINESS ADDRESS:	
		STREET 1:		ONE MERCK DR
		STREET 2:		P O BOX 100
		CITY:			WHITEHOUSE STATION
		STATE:			NJ
		ZIP:			08889-0100
		BUSINESS PHONE:		9084234044

	MAIL ADDRESS:	
		STREET 1:		ONE MERCK DR
		STREET 2:		PO BOX 100 WS3AB-05
		CITY:			WHITEHOUSE STATION
		STATE:			NJ
		ZIP:			08889-0100

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BARCLAYS GLOBAL INVESTORS NA /CA/
		CENTRAL INDEX KEY:			0000913414
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				943112180
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		45 FREMONT ST 17TH FL
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94105
		BUSINESS PHONE:		4155972639

	MAIL ADDRESS:	
		STREET 1:		45 FREMONT ST
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94105

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BZW BARCLAYS GLOBAL INVESTORS NA
		DATE OF NAME CHANGE:	19960311

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WELLS FARGO INSTITUTIONAL TRUST CO
		DATE OF NAME CHANGE:	19960226
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>merck123104.txt
<TEXT>
Document 1 - file: merck123104.txt

</DOCUMENT>
</SEC-DOCUMENT>