Which of the Dow 30 still exist today?

Answer 1

All of them. The Dow 30 changes yearly.

Answer 2

Original Dow 30
on 10/1/1928
Allied-Signal (Allied Chemical)
Primerica (American Can)
American Smelting
American Sugar
American Brands (American Tobacco B)
Atlantic Refining
Bethlehem Steel
Chrysler
General Electric
General Motors
General Railway Signal
Goodrich
Navistar International (International Harvester)
Inco Limited (International Nickel)
Mack Trucks
Nash Kelvinator (Nash Motors)
North American
Paramount Publix
General Foods (Postum Inc.)
Radio Corp.
Sears
Exxon (Standard Oil New Jersey)
Texaco (Texas Corp.)
Texas Gulf Sulpher
Union Carbide
USX (U.S. Steel)
Victor Talking Machine
CBS (Westinghouse Electric)
Woolworth
Wright Aeronautical

Current Dow 30
SBC SBC Communications
GM General Motors (part of the original)
MO Altria
MRK Merck
VZ Verizon
JPM JP Morgan Chase
C Citigroup
DD DuPont
PFE Pfizer
GE General Electric (part of the original)
KO Coca-Cola
HON Honeywell
XOM ExxonMobil
BA Boeing
AA Alcoa
PG Procter & Gamble
JNJ Johnson & Johnson
MMM Minnesota Mining & Manufacturing
MCD McDonald's
CAT Caterpillar
HPQ Hewlett-Packard
INTC Intel
UTX United Technologies
MSFT Microsoft
WMT Wal-Mart
DIS Disney
AXP American Express
HD Home Depot
IBM International Business Machines
AIG American International Group