| United States |
| 1847 Issue (47) |
| 1851 Issue (52) |
| 1857 Issue (64) |
| 1861 Premiere Gravures (5) |
| 1861-1866 Issue (59) |
| 1867 Grilled Issue (33) |
| 1869 Pictorial Issue (26) |
| 1870-1871 National Bank Note Co. Issue, H Grill (1) |
| 1870-1871 National Bank Note Co. Issue, I Grill (14) |
| 1870-1871 National Bank Note Co. Issue, without gr (5) |
| 1873 Continental Bank Note Co. Issue, white wove (7) |
| 1875 Continental Bank Note Co. Issue, yellowish wo (2) |
| 1875 Re-issue of the 1861-1866 Issue (1) |
| 1875 Re-issue of the 1869 Pictorial Issue (5) |
| 1875 Reprints of the 1857 Issue (5) |
| 1875 Special Printing of the 1873 Continental Issu (1) |
| 1879 American Bank Note Co. Issue, soft paper (10) |
| 1881-1882 American Bank Note Co. Issue, re-engrave (5) |
| 1887 American Bank Note Co. Issue (8) |
| 1890-1893 Small Bank Notes Issue (9) |
| 1893 Columbian Issue (42) |
| 1894 First Bureau Issue, Unwatermarked (14) |
| 1895 First Bureau Issue, Watermarked (21) |
| 1898 First Bureau Issue, UPU colors (3) |
| 1898 Trans-Mississippi Issue (28) |
| 1901 Pan-American Issue (11) |
| 1902-1908 Second Bureau Issue (21) |
| 1904 Louisiana Purchase Issue (7) |
| 1907 Jamestown Issue (2) |
| 1908-1909 Washington-Franklin Issue, DL wmk, imper (2) |
| 1908-1909 Washington-Franklin Issue, DL wmk, perf (9) |
| 1908-1910 Washington-Franklin Issue, DL wmk, perf (9) |
| 1909 Commemorative Issues (5) |
| 1909 Washington-Franklin Issue, Bluish Paper (5) |
| 1910 Washington-Franklin Issue, SL wmk, imperf (1) |
| 1910-1911 Washington-Franklin Issue, SL wmk, perf (4) |
| 1910-1913 Washington-Franklin Issue, SL wmk, perf (3) |
| 1912 Washington-Franklin Issue, DL wmk, perf 12 (3) |
| 1912 Washington-Franklin Issue, SL wmk, perf 8½ co (2) |
| 1912-1914 Washington-Franklin Issue, SL wmk, perf (1) |
| 1912-1918 Washington-Franklin Issues (3) |
| 1913-1915 Panama-Pacific Issue (19) |
| 1913-1915 Washington-Franklin Issue, SL wmk, perf (11) |
| 1914 Washington-Franklin Issue, SL wmk, compound p (1) |
| 1914 Washington-Franklin Issue, SL wmk, imperf, ro (4) |
| 1914 Washington-Franklin Issue, SL wmk, perf 10 co (4) |
| 1914-1916 Washington-Franklin Issue, SL wmk, perf (8) |
| 1915 Washington-Franklin Issue, SL wmk, perf 11 (1) |
| 1916-1917 Washington-Franklin Issue, flat plate, u (28) |
| 1916-1922 Washington-Franklin Issue, rotary plate, (5) |
| 1917 Washington-Franklin Issue, flat plate, DL wmk (3) |
| 1917-1919 Washington-Franklin Issue, flat plate, u (32) |
| 1918 Washington-Franklin Issue, flat plate, perf 1 (4) |
| 1918-1920 Washington-Franklin Issue, offset, imper (8) |
| 1918-1920 Washington-Franklin Issue, offset, perf (3) |
| 1919 Victory Issue (1) |
| 1919 Washington-Franklin Issue, offset, perf 12½ (1) |
| 1919-1920 Washington-Franklin Issue, rotary coil w (7) |
| 1920 Pilgrim Tercentenary Issue (5) |
| 1920 Washington-Franklin Issue, flat plate, perf 1 (2) |
| 1922-1929 Fourth Bureau Issue (41) |
| 1922-1996 Issues (5) |
| 1923 Harding Memorial Issue (2) |
| 1923-1956 Issues (1) |
| 1924 Huguenot-Walloon Tercentenary Issue (1) |
| 1925 Lexington-Concord Sesquicentenary Issue (1) |
| 1925-1929 Issues (5) |
| 1929 Kansas-Nebraska Issue (15) |
| 1929-1937 Issues (7) |
| 1938-1954 Presidential Series (5) |
| 1938-Present Issues (4) |
| 1960-1979 Error Issues (30) |
| 1980-2018 Error Issues (89) |
| Airmail (78) |
| Booklets (5) |
| Carrier (6) |
| Carrier - Semi-Official (8) |
| Hunting Permit |
| Duck Stamps (18) |
| Junior Duck Stamps (2) |
| State Duck Stamps [to sort alpha by state then cat (1) |
| Local (28) |
| Miscellaneous Back-of-the-Book |
| Cinderellas (1) |
| Newspaper (40) |
| Official (53) |
| Parcel Post (12) |
| Parcel Post Postage Due (2) |
| Post Office Seals (2) |
| Registry (1) |
| Postage Due (23) |
| Postal History (4) |
| Postal Note (1) |
| Postal Stationery (8) |
| Message-Reply Postal Cards (1) |
| Official Envelopes (2) |
| Official Postal Cards (1) |
| Postal Cards (6) |
| Postmasters’ Provisionals (10) |
| Registration (1) |
| Revenue (52) |
| Beer (3) |
| Consular Service Fee (3) |
| Distilled Spirits Excise Tax (3) |
| Narcotic Tax (1) |
| Private Die Match (5) |
| Private Die Medicine (12) |
| Private Die Perfumery (1) |
| Proprietary (2) |
| Revenue Stamped Paper (1) |
| Silver Tax (3) |
| Stock Transfer (4) |
| Trailer Permit Stamps (1) |
| Wines (6) |
| Sanitary Fair (1) |
| Savings |
| Postal Savings (3) |
| Treasury Savings (1) |
| War Savings (6) |
| Special Delivery (16) |
| Stamps (1) |
| Tax Paid (2) |
| Snuff (1) |
| Telegraph Stamps and Sanitary Fair (6) |
| Test Stamps and Cinderellas (9) |
| U.S. Postal Agency in China (29) |