EXHIBIT 21
As of August 31, 2006 Walgreen Co., (Registrant) had the following subsidiaries:
| NAME | STATE OR COUNTRY OF INCORPORATION |
| Walgreen Arizona Drug Co. (1) | Arizona |
| Happy Harry’s Inc. (2) | Delaware |
| Medmark, Inc. (3) | Delaware |
| Waltrust Properties, Inc. (1) | Delaware |
| Bond Drug Company of Illinois, LLC (1) | Illinois |
| Bowen Development Company | Illinois |
| Grenada Advertising Agency, Inc. | Illinois |
| Schraft’s, A Walgreens Specialty Pharmacy, LLC | Illinois |
| SeniorMed LLC (5) | Illinois |
| Walgreens Home Care, Inc. | Illinois |
| Walgreens Mail Service, Inc. | Illinois |
| Walgreens.com, Inc. | Illinois |
| Walgreens Health Initiatives, Inc. (4) | Illinois |
| Walgreen Texas LLC (6) | Illinois |
| Walgreen Mercantile Corp. | Illinois |
| Walgreen National Corporation | Illinois |
| Walgreen Realty Resources LLC (7) | Illinois |
| Walgreen Louisiana Co., Inc. | Louisiana |
| Walgreen Hastings Co. (1) | Nebraska |
| Walgreen Eastern Co., Inc. (1) | New York |
| Walgreen of Puerto Rico, Inc. | Puerto Rico |
| Walgreen of San Patricio, Inc. | Puerto Rico |
| (1) | Walgreens Hastings Co. is a direct parent of Walgreen Arizona Drug Co. Walgreen Arizona Drug Co. is a direct parent of Walgreen Eastern Co. Walgreen Eastern Co is a direct parent of Bond Drug Company of Illinois, LLC. Bond Drug Company of Illinois, LLC is a direct parent of Waltrust Properties, Inc. A minority interest in Waltrust Properties, Inc. is held by outside preferred shareholders. |
| (2) | Happy Harry’s Discount Drug Stores, Inc. (a Delaware corporation) is a direct parent of Happy Harry’s Inc. Happy Harry’s Inc. is a direct parent of HHDH Corp. (a Delaware corporation). |
| (3) | Medmark Holdings, Inc. (a Delaware corporation) is a direct parent of Medmark, , Inc. Medmark, Inc. is a direct parent of Medmark Data Management, Inc. (A Delaware corporation). |
| (4) | Walgreen Health Initiatives, Inc. is a direct parent of a New York inactive subsidiary. |
| (5) | SeniorMed LLC is owned 66.67% by the Registrant. |
| (6) | Walgreen Texas LP is a partnership that holds beneficial interest in all Registrants Texas operations. Walgreen Texas LLC is a limited liability corporation and subsidiary of the Registrant that holds a 99% limited liability interest in Walgreen Texas LP. |
| (7) | Walgreen Realty Resources LLC is a direct parent of Walgreen Market Strategies LLC (an Illinois corporation). |
The registrant also wholly owns inactive subsidiaries which are not included in the above list. All wholly owned subsidiaries are included in the consolidated financial statements.
