| United States |
| 1847 Issue (13) |
| 1851 Issue (9) |
| 1857 Issue (13) |
| 1861-1866 Issue (12) |
| 1867 Grilled Issues (11) |
| 1869 Pictorial Issue (14) |
| 1870-1871 National Bank Note Co. Issue, Grilled (9) |
| 1870-1871 National Bank Note Co. Issue, Without Gr (3) |
| 1873-1875 Continental Bank Note Co. Issue (4) |
| 1875 Re-issue of the 1861-1866 Issues (10) |
| 1875 Re-issue of the 1869 Pictorial Issue (5) |
| 1875 Reprints of the 1857 Issue (11) |
| 1879-88 American Bank Note Co. Issues (6) |
| 1890 Issue (6) |
| 1893 Columbian Issue (4) |
| 1894-1898 Bureau Issues (7) |
| 1898 Trans-Mississippi Issue (4) |
| 1901 Pan-American Issue (5) |
| 1902-1908 Regular Issues (7) |
| 1904 Louisiana Purchase & Jamestown Issues (6) |
| 1908-1910 Washington-Franklin Issue, DL Watermark (9) |
| 1909 Bluish Paper Issue (3) |
| 1910-1911 Washington-Franklin Issue, SL Watermark (10) |
| 1912-1914 Washington-Franklin Issue, SL Watermark, (5) |
| 1913-1915 Panama-Pacific Issue (3) |
| 1914-1915 Washington-Franklin Issue, SL Watermark, (10) |
| 1916-1919 Washington-Franklin Issue, Unwatermarked (6) |
| 1917-1919 Washington-Franklin Issue, Perf. 11 (9) |
| 1918-1923 Issues (8) |
| 1926-1994 Issues (41) |
| Advertising and Campaign Covers (7) |
| Airmail Issue (12) |
| Carrier & Local Issues (11) |
| Confederacy Regular Issues (11) |
| Confederacy Town & Provisional Issues (9) |
| Flag of Truce Covers (2) |
| Free Franks and Autographs (13) |
| Newspaper Stamps & Parcel Post (4) |
| Offices in China & Officials (5) |
| Postmasters' Provisionals (2) |
| Registry & Postage Dues (5) |
| Regular Issues (6) |
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| Town Postal Markings (8) |
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| Via Nicaragua & Panama (4) |
| Western Covers (4) |