| United States |
| 1847 Issue (13) |
| 1851 Issue (17) |
| 1857 Issue (22) |
| 1861-1866 Issue (19) |
| 1867 Grilled Issue (15) |
| 1869 Pictorial Issue (13) |
| 1870-1871 National Bank Note Co. Issue, H Grill (3) |
| 1870-1871 National Bank Note Co. Issue, without gr (8) |
| 1873 Continental Bank Note Co. Issue, white wove (12) |
| 1875 Re-issue of the 1861-1866 Issue (1) |
| 1875 Re-issue of the 1869 Pictorial Issue (3) |
| 1875 Reproductions of the 1847 Issue (1) |
| 1879 American Bank Note Co. Issue, soft paper (4) |
| 1881-1882 American Bank Note Co. Issue, re-engrave (8) |
| 1887 American Bank Note Co. Issue (4) |
| 1890-1893 Small Bank Notes Issue (5) |
| 1893 Columbian Issue (32) |
| 1894 First Bureau Issue, Unwatermarked (10) |
| 1895 First Bureau Issue, Watermarked (14) |
| 1898 First Bureau Issue, UPU colors (9) |
| 1898 Trans-Mississippi Issue (20) |
| 1901 Pan-American Issue (15) |
| 1902-1908 Second Bureau Issue (33) |
| 1904 Louisiana Purchase Issue (6) |
| 1907 Jamestown Issue (4) |
| 1908-1909 Washington-Franklin Issue, DL wmk, imper (2) |
| 1908-1909 Washington-Franklin Issue, DL wmk, perf (7) |
| 1908-1910 Washington-Franklin Issue, DL wmk, perf (13) |
| 1909 Commemorative Issues (24) |
| 1909 Washington-Franklin Issue, Bluish Paper (5) |
| 1910 Washington-Franklin Issue, SL wmk, imperf (2) |
| 1910-1911 Washington-Franklin Issue, SL wmk, perf (7) |
| 1910-1913 Washington-Franklin Issue, SL wmk, perf (6) |
| 1912 Washington-Franklin Issue, SL wmk, imperf (5) |
| 1912 Washington-Franklin Issue, SL wmk, perf 8½ co (4) |
| 1912-1914 Washington-Franklin Issue, SL wmk, perf (4) |
| 1913-1915 Panama-Pacific Issue (18) |
| 1913-1915 Washington-Franklin Issue, SL wmk, perf (13) |
| 1914 Washington-Franklin Issue, SL wmk, perf 10 co (13) |
| 1914-1916 Washington-Franklin Issue, SL wmk, perf (7) |
| 1915 Washington-Franklin Issue, DL wmk, perf 10 (1) |
| 1915 Washington-Franklin Issue, SL wmk, perf 11 (3) |
| 1916-1917 Washington-Franklin Issue, flat plate, u (20) |
| 1916-1922 Washington-Franklin Issue, rotary plate, (20) |
| 1917-1919 Washington-Franklin Issue, flat plate, u (12) |
| 1918 Washington-Franklin Issue, flat plate, perf 1 (2) |
| 1918-1920 Washington-Franklin Issue, offset, imper (3) |
| 1918-1920 Washington-Franklin Issue, offset, perf (3) |
| 1919 Victory Issue (2) |
| 1919-1920 Washington-Franklin Issue, rotary coil w (2) |
| 1920 Pilgrim Tercentenary Issue (4) |
| 1920 Washington-Franklin Issue, flat plate, perf 1 (7) |
| 1921 Washington-Franklin Issue, rotary coil waste, (2) |
| 1922-1929 Fourth Bureau Issue (56) |
| 1923 Harding Memorial Issue (2) |
| 1924 Huguenot-Walloon Tercentenary Issue (2) |
| 1925 Lexington-Concord Sesquicentenary Issue (11) |
| 1925 Norse-American Issue (3) |
| 1925-1929 Issues (20) |
| 1929 Kansas-Nebraska Issue (7) |
| 1929-1937 Issues (32) |
| 1938-1954 Presidential Series (9) |
| 1938-Present Issues (66) |
| Accumulations (1) |
| Airmail (67) |
| Booklets (1) |
| Errors, Freaks & Oddities (2) |
| Essays & Proofs |
| Printers' Samples (6) |
| General Collections (4) |
| Hunting Permit |
| Duck Stamps (8) |
| Junior Duck Stamps (1) |
| Local (8) |
| Miscellaneous Back-of-the-Book (1) |
| Newspaper (2) |
| Official (5) |
| Parcel Post (3) |
| Post Office Seals (1) |
| Postage Due (15) |
| Postal History Collections (3) |
| Postal Stationery |
| Airmail Envelopes (2) |
| Envelopes & Wrappers (4) |
| Postmasters’ Provisionals (5) |
| Registration (3) |
| Revenue |
| Beer (1) |
| First to Third Issues (6) |
| Marihuana Tax (1) |
| Narcotic Tax (3) |
| Silver Tax (1) |
| Stock Transfer (3) |
| Wines (2) |
| Special Delivery (27) |
| Special Handling (5) |
| Telegraph (1) |
| Test Stamps (2) |
| Topical Collections (1) |
| U.S. Postal Agency in China (23) |
| U.S. Registry Exchange Labels (1) |
| Vending & Affixing Machine Perforations (2) |
