The following ISBN ranges have at least 2000 books/other media listed in this site:

HarperCollins
Macmillan
Holt McDougal
HarperCollins
HarperCollins
McGraw-Hill
Pergamon Press
Random House
Stationery Office Books
Academic Press
Prentice Hall
Penguin
Harcourt
Oxford University Press
Addison-Wesley
Allyn and Bacon
University Of Chicago Press
Palgrave Macmillan
Columbia University Press
Indiana University Press
The MIT Press
Mills & Boon
Yale University Press
Da Capo Press
Alfred A. Knopf
Zondervan
St. Martin's Press
Greenwood
0-314
Hachette Book Group USA
Ordnance Survey
Addison-Wesley
Mosby
Pan Books, Pan Macmillan, Time Warner
Palgrave Macmillan
Open University Press
Hodder & Stoughton
Ballantine Books
Harlequin Books
Farrar, Straus and Giroux
Random House
Avon
Doubleday
Springer
W. W. Norton & Company
Random House
Houghton Mifflin
Penguin Putnam
Routledge
Berkley
Heinemann
Scholastic
Dell
Ace
Warner Books
Signet
John Wiley & Sons
Wiley
Dover Publications
Wadsworth Publishing
Thames & Hudson
Crown Publishers
University of California Press
Cambridge University Press
Wadsworth; Brooks/Cole
Scholastic
Corgi
Bantam
BBC
Faber and Faber
Gollancz
Longman
Scholastic
iUniverse, Inc.
Houghton Mifflin
Wiley-Blackwell
Viking Press
Simon & Schuster
Harvard University Press
Random House
Scribners
William Morrow and Company
Simon & Schuster
Princeton University Press
A & C Black Publishers Ltd
Mosby
Arcadia Publishing
Random House Audio
Andrews McMeel Publishing
Simon & Schuster
Pocket Books
Usborne Publishing Ltd
Bloomsbury Publishing PLC
Piatkus
Butterworth-Heinemann
The History Press Ltd
Orion
Headline
0-7566
Motorbooks
0-7619
Globe Pequot
Candlewick
Jones & Bartlett Publishers
Barron's Educational Series
Schiffer Publishing
John Wiley & Sons
0-7653
McClelland & Stewart
Lippincott Williams & Wilkins
Marvel
French & European Pubns
McFarland
Hyperion
Jossey-Bass
Cornell University Press
The Johns Hopkins University Press
University of Nebraska Press
Henry Holt and Company
Harry N. Abrams
Chronicle Books
Birkhauser
Continuum
CRC Press
Wiley
Nabu Press
Nabu Press
Nabu Press
Nabu Press
Nabu Press
Nabu Press
1-4000
Tantor Media
DC Comics
Sourcebooks
Sterling
Palgrave Macmillan
Wiley-Blackwell
Dorling Kindersley
1-4129
1-4165
1-4169
VIZ Media LLC
1st World Library - Literary Society
1-4332
1-4391
Hachette
Seuil
Larousse
Michelin Editions des Voyages
Gallimard
Flammarion
2-09
Dunod
Presses Universitaires de France - PUF
Casterman
L'Ecole des loisirs
Eyrolles
Fayard
Hatier
Robert Laffont
Albin Michel
Le Livre de Poche
Pocket
Harlequin
J'ai lu
Glénat
Ellipses Marketing
Actes Sud
Micro Application
岩波書店
角川書店
学習研究社
講談社
集英社
小学館
新潮社
中央公論新社
早川書房
文藝春秋
河出書房新社
幻冬舎
ダイヤモンド社
筑摩書房
PHP研究所
Mondadori
Einaudi
EDB
Rizzoli
Brill Academic Pub