| United States |
| 1847 Issue (25) |
| 1851 Issue (27) |
| 1857 Issue (54) |
| 1861 Premiere Gravures (4) |
| 1861-1866 Issue (42) |
| 1867 Grilled Issue (41) |
| 1869 Pictorial Issue (111) |
| 1870-1871 National Bank Note Co. Issue, H Grill (14) |
| 1870-1871 National Bank Note Co. Issue, without gr (13) |
| 1873 Continental Bank Note Co. Issue, white wove (11) |
| 1875 Continental Bank Note Co. Issue, yellowish wo (1) |
| 1875 Re-issue of the 1861-1866 Issue (12) |
| 1875 Re-issue of the 1869 Pictorial Issue (40) |
| 1875 Reprints of the 1857 Issue (10) |
| 1875 Reproductions of the 1847 Issue (9) |
| 1879 American Bank Note Co. Issue, soft paper (9) |
| 1881-1882 American Bank Note Co. Issue, re-engrave (2) |
| 1887 American Bank Note Co. Issue (2) |
| 1890-1893 Small Bank Notes Issue (3) |
| 1893 Columbian Issue (36) |
| 1894 First Bureau Issue, Unwatermarked (6) |
| 1895 First Bureau Issue, Watermarked (7) |
| 1898 First Bureau Issue, UPU colors (8) |
| 1898 Trans-Mississippi Issue (31) |
| 1901 Pan-American Issue (14) |
| 1902-1908 Second Bureau Issue (6) |
| 1904 Louisiana Purchase Issue (4) |
| 1907 Jamestown Issue (4) |
| 1908-1909 Washington-Franklin Issue, DL wmk, perf (7) |
| 1908-1910 Washington-Franklin Issue, DL wmk, perf (2) |
| 1909 Commemorative Issues (6) |
| 1909 Washington-Franklin Issue, Bluish Paper (4) |
| 1910-1911 Washington-Franklin Issue, SL wmk, perf (2) |
| 1910-1913 Washington-Franklin Issue, SL wmk, perf (2) |
| 1912 Washington-Franklin Issue, DL wmk, perf 12 (2) |
| 1912 Washington-Franklin Issue, SL wmk, perf 8½ co (2) |
| 1912-1914 Washington-Franklin Issue, SL wmk, perf (5) |
| 1913-1915 Panama-Pacific Issue (8) |
| 1913-1915 Washington-Franklin Issue, SL wmk, perf (5) |
| 1914 Washington-Franklin Issue, SL wmk, perf 10 co (2) |
| 1914-1916 Washington-Franklin Issue, SL wmk, perf (6) |
| 1915 Washington-Franklin Issue, DL wmk, perf 10 (2) |
| 1915 Washington-Franklin Issue, SL wmk, perf 11 (1) |
| 1916-1917 Washington-Franklin Issue, flat plate, u (7) |
| 1916-1922 Washington-Franklin Issue, rotary plate, (2) |
| 1917 Washington-Franklin Issue, flat plate, DL wmk (2) |
| 1917-1919 Washington-Franklin Issue, flat plate, u (24) |
| 1918 Washington-Franklin Issue, flat plate, perf 1 (1) |
| 1920 Pilgrim Tercentenary Issue (2) |
| 1920 Washington-Franklin Issue, flat plate, perf 1 (3) |
| 1922 Washington-Franklin Issue, rotary sheet waste (1) |
| 1922-1929 Fourth Bureau Issue (19) |
| 1925 Norse-American Issue (1) |
| 1925-1929 Issues (7) |
| 1929-1937 Issues (4) |
| 1938-1954 Presidential Series (4) |
| 1938-Present Issues (65) |
| Airmail (58) |
| Airmail Postal History |
| DO-X Flights (1) |
| First Flights (26) |
| Zeppelin Covers (1) |
| Zeppelin Covers: Graf Zeppelin LZ 127 Flights (16) |
| Airmail Special Delivery (1) |
| Booklets (11) |
| Canal Zone (28) |
| Carrier (1) |
| Errors, Freaks & Oddities (1) |
| General Collections (1) |
| General Issues (12) |
| General Works on Philately (1) |
| Guam (2) |
| Hawaii (9) |
| Hunting Permit |
| Duck Stamps (14) |
| Local (8) |
| Newspaper (1) |
| Official (3) |
| Parcel Post (6) |
| Parcel Post Postage Due (1) |
| Postage Due (2) |
| Postal Stationery |
| Airmail Envelopes (1) |
| Envelopes & Wrappers (2) |
| Official Envelopes (1) |
| Postal Cards (4) |
| Postmasters’ Provisionals (4) |
| Puerto Rico (2) |
| Revenue |
| Customs Fees (1) |
| Distilled Spirits Excise Tax (1) |
| First to Third Issues (17) |
| Marihuana Tax (2) |
| Motor Vehicle Use (1) |
| Private Die Match (1) |
| Private Die Medicine (14) |
| Private Die Perfumery (1) |
| Revenue Stamped Paper (2) |
| Silver Tax (6) |
| Stock Transfer (1) |
| Wines (4) |
| Sanitary Fair (1) |
| Savings |
| War Savings (1) |
| Special Delivery (11) |
| State/Territorial Postal History |
| Arizona Territory (1) |
| Test Stamps (2) |
| U.S. Postal Agency in China (8) |
| Vending & Affixing Machine Perforations (1) |
