85
Exhibit 21
SUBSIDIARIES OF HARTE-HANKS, INC.
As of September 30, 2002
<Table>
<Caption>
Jurisdiction of
Name of Entity Organization % Owned
- -------------- ------------ -------
DiMark, Inc. New Jersey 100%
DMK, Inc. Delaware 100%(2)
The Flyer Publishing Corporation Florida 100%
Harte-Hanks CRM Services UK Limited England 100%
Harte-Hanks Data Services LLC Maryland 100%
Harte-Hanks Data Technologies LLC Delaware 100%
Harte-Hanks Delaware, Inc. Delaware 100%
Harte-Hanks Direct, LLC Delaware 100%(1)
Harte-Hanks Direct Marketing/Baltimore, Inc. Maryland 100%
Harte-Hanks Direct Marketing/Cincinnati, Inc. Ohio 100%
Harte-Hanks Direct Marketing/Dallas, L.P. Delaware 100%(6)
Harte-Hanks Direct Marketing/Fullerton, Inc. California 100%
Harte-Hanks Direct Marketing/Jacksonville, LLC Delaware 100%(10)
Harte-Hanks Direct Marketing/Kansas City, LLC Delaware 100%(11)
Harte-Hanks do Brazil Consultoria e Servicos Ltda. Brazil 100%(3)
Harte-Hanks IRG, Inc. Michigan 100%
Harte-Hanks Limited England 100%(3)
Harte-Hanks Market Intelligence, Inc. California 100%
Harte-Hanks Market Intelligence Espana LLC Colorado 100%
Harte-Hanks Market Intelligence Europe B.V. Netherlands 100%
Harte-Hanks Market Intelligence GmbH Germany 100%(4)
Harte-Hanks Market Intelligence Limited Ireland 100%(4)
Harte-Hanks Market Intelligence Limited England 100%(4)
Harte-Hanks Market Intelligence SAS France 100%(4)
Harte-Hanks Market Research, Inc. New Jersey 100%
Harte-Hanks Partnership, Ltd. Texas 100%(5)
Harte-Hanks Print, Inc. New Jersey 100%
Harte-Hanks Pty. Limited Australia 100%(3)
Harte-Hanks Response Management/Austin L.P. Delaware 100%(6)
Harte-Hanks Response Management/Boston, Inc. Massachusetts 100%
Harte-Hanks Response Management Call Centers, Inc. Delaware 100%
Harte-Hanks Response Management Europe Belgium 100%
Harte-Hanks Shoppers, Inc. California 100%
Harte-Hanks Stock Plan, Inc. Delaware 100%
Harte-Hanks Teleservices, LLC Delaware 100%(2)
H&R Communications, LLC Delaware 100%(2)
HTS, Inc. Connecticut 100%
Information for Marketing Limited (shell corporation) England 100%(7)
NSO, Inc. Ohio 100%
Printing Management Systems, Inc. Delaware 100%
Sales Support Services, Inc. New Jersey 100%(8)
Sales Support Services of Texas, Inc. Delaware 100%(9)
Southern Comprint Co. California 100%
Spectral Resources, Inc. New York 100%
</Table>
(1) Owned by Harte-Hanks Response Management Call Centers, Inc.
(2) Owned by Harte-Hanks Direct, LLC
(3) Owned by Harte-Hanks Data Technologies LLC
(4) Owned by Harte-Hanks Market Intelligence Europe B.V.
(5) 99.5% Owned by Harte-Hanks Delaware, Inc.
.5% Owned by Harte-Hanks , Inc.
(6) 99% Owned by Harte-Hanks Stock Plan, Inc.
1% Owned by Harte-Hanks Response Management Call Centers, Inc.
(7) Owned by Harte-Hanks Limited
(8) Owned by Harte-Hanks Delaware, Inc.
(9) Owned by Sales Support Services, Inc.
(10) Owned by Harte-Hanks Direct Marketing/Cincinnati, Inc.
(11) Owned by Printing Management Systems, Inc.