- American Philatelic Research Library
 - The largest public philatelic library in the United States. Includes searchable catalogue. - National Postal Museum@
- Spellman Museum of Stamps and Postal History
- Dedicated to learning about the world's cultures through stamps and postal history.
- Rocky Mountain Philatelic Library
- Collection include books, periodicals, auction catalogues, post office publications, and more.
- Postal Museum, The
- Located in the old town (Den gamle By). Here you can see old furnitures, cancellations marks, weights and desk of the inventor of the Christmas Seal.
- Museum of U.S. Essays & Proofs, The
- Provides galleries of postage, postal stationary, airmail, and counterfeit stamps.
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