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http://www.djindexes.com/downloads/DJIA_Hist_Comp.pdf

The Dow Jones Industrial Average (DJIA) began on July 3, 1884, with the following companies comprising the index:

Chicago & North Western (railroad)
Delaware, Lackawanna & Western (railroad)
Lake Shore (railroad)
Louisville & Nashville (railroad)
Missouri Pacific (railroad)
New York Central (railroad)
Northern Pacific pfd. (railroad)
Pacific Mail (steamship)
St. Paul (railroad)
Union Pacific (railroad)
Western Union (communications)

The first true "all industrial" DJIA came on May 26, 1896:

American Cotton Oil
American Sugar
American Tobacco
Chicago Gas
Distilling & Cattle Feeding
General Electric
Laclede Gas
National Lead
North American
Tennessee Coal & Iron
U.S. Leather pfd.
U.S. Rubber

General Motors was added to the DJIA on March 16, 1915:

Almagamated Copper
American Car & Foundry
American Smelting & Refining
American Sugar
Central Leather
General Electric Company
General Motors Corporation
National Lead
Peoples Gas
U.S. Rubber
U.S. Steel
U.S. Steel pfd.

The DJIA list remained the same from March 14, 1939 until July 3, 1956:

American Smelting
American Telephone & Telegraph
American Tobacco B
Bethlehem Steel
Chrysler
Corn Products Refining
Du Pont
Eastman Kodak Company
General Motors Corporation
Goodyear
International Harvester
International Nickel
Johns-Manville
Loew's
National Distillers
National Steel
Standard Oil of California
Standard Oil (New Jersey)
Texas Company
Union Carbide
United Aircraft
U.S. Steel
Westinghouse Electric
Woolworth

By June 29, 1979, the DJIA had changed slightly to include:

Allied Chemical
Aluminum Company of America
American Can
American Telephone & Telegraph
American Tobacco B
Bethlehem Steel
Du Pont
Eastman Kodak Company
Exxon Corporation (nee Standard Oil, NJ)
General Electric Company
General Foods
General Motors Corporation
Goodyear
Inco (nee International Nickel)
International Business Machines
International Harvester
International Paper Company
Merck & Company, Inc.
Minnesota Mining & Manufacturing
Owens-Illinois Glass
Procter & Gamble Company
Sears Roebuck & Company
Standard Oil of California
Texaco Incorporated (nee Texas Company)
Union Carbide
United Technologies Corporation (nee United Aircraft)
U.S. Steel
Westinghouse Electric
Woolworth

By January 27, 2003 the DJIA index was comprised of:

3M Company (nee Minnesota Mining & Manufacturing)
Alcoa Incorporated (nee Aluminum Company of America)
Altria Group, Incorporated
American Express Company
AT&T Corporation (nee American Telephone & Telegraph)
Boeing Company
Caterpillar Incorporated
Citigroup Incorporated
Coca-Cola Company
DuPont
Eastman Kodak Company
Exxon Mobil Corporation (nee Exxon Corporation)
General Electric Company
General Motors Corporation
Hewlett-Packard Company
Home Depot Incorporated
Honeywell International Inc.
Intel Corporation
International Business Machines
International Paper Company
J.P. Morgan Chaase & Company
Johnson & Johnson
McDonald's Corporation
Merck & Company, Incorporated
Microsoft Corporation
Procter & Gamble Company
SBC Communications Incorporated
United Technologies Corporation
Wal-Mart Stores Incorporated
Walt Disney Company