Visit our retail store

Illinois Office Supply has a unique retail store. We offer a diverse line of paper stock and envelopes. If it is paper for your everyday use or finding just the right stock for that special document or envelope we have it. All our stock and envelopes are available to be purchased by the package or by the piece. You no longer need to buy 100 envelopes when you want just 5. IOS offers the largest selection of envelope sizes and colors available in stock in the Ottawa area. Come visit and see what we have to offer!

  • A-2, A-6, A-7, A-8, A-10 announcement envelopes.   
  • #10 regular and window envelopes. 
  • 8 ½ x 11 size available in 24#, 70# or 80# text weight. 
  • 8 ½ x 11 size available in 65# or 80# cover. .
  • Paper and envelopes available in various colors and finishes.
  • Booklet & catalog envelopes available in white & brown kraft in various sizes from 6x9 to 12 x 15 ½. 
  • All our envelopes and papers are sold in packages or by the piece.

Contact Us

1119 La Salle Street
Ottawa, IL 61350

Phone:      815-434-0186
Toll-Free:  800-892-7861
Fax:          815-434-2665


Business Hours

8:30 AM to 5:00 PM Monday - Friday

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Our People

The staff at Illinois Office Supply's number one goal is customer satisfaction.