1991 U.S. First Day Covers
| Description | Date | City | Denom | Designer |
| Switzerland's 700th Anniversary | Feb 22, 1991 | Washington, DC 20066 | 0.50 | Hans Hartman |
| Vermont Statehood | Mar 1, 1991 | Bennington, VT 05201 | 0.29 | Sabra Field |
| Dennis Chavez | Apr 3, 1991 | Albuquerque, NM 87101 | 0.35 | Chris Calle |
| Olympic Flag Stamp | Apr 21, 1991 | Atlanta, GA 30304 | 0.29 | John Boyd |
| U.S. Savings Bonds 50th Anniversary | Apr 30, 1991 | Washington, DC 20066 | 0.29 | Primo Angeli |
| Love Stamp 1991 | May 9, 1991 | Honolulu, HI 96820 | 0.29 | Harry Zelenko |
| William Saroyan | May 22, 1991 | Fresno, CA 93706 | 0.29 | Ren Wicks |
| Fishing Flies - Apte Tarpon Fly & Lefty's Deceiver | May 31, 1991 | Cuddebackville, NY 12729 | 0.29 | Chuck Ripper |
| Fishing Flies - Jock Scott & Royal Wulff | May 31, 1991 | Cuddebackville, NY 12729 | 0.29 | Chuck Ripper |
| Fishing Flies - Muddler Minnow | May 31, 1991 | Cuddebackville, NY 12729 | 0.29 | Chuck Ripper |
| Cole Porter | Jun 8, 1991 | Peru, IN 46970 | 0.29 | Jim Sharpe |
| Desert Storm | Jul 2, 1991 | Washington, DC 20066 | 0.29 | Jack Williams |
| Olympic Track and Field - Hurdles | Jul 12, 1991 | Los Angeles, CA 90052 | 0.29 | Joni Carter |
| Olympic Track and Field - Pole Vault & Discus | Jul 12, 1991 | Los Angeles, CA 90052 | 0.29 | Joni Carter |
| Olympic Track and Field - Sprint & Javelin | Jul 12, 1991 | Los Angeles, CA 90052 | 0.29 | Joni Carter |
| Numismatics | Aug 13, 1991 | Chicago, IL 60607 | 0.29 | V. Jack Ruther |
| Basketball Centennial | Aug 28, 1991 | Springfield, MA 01101 | 0.29 | Lon Busch |
| Comedians - Fanny Brice & Abbott and Costello | Aug 29, 1991 | Los Angeles, CA 90028 | 0.29 | Al Hirschfeld |
| Comedians - Jack Benny & Bergen and McCarthy | Aug 29, 1991 | Hollywood, CA 90028 | 0.29 | Al Hirschfeld |
| Comedians - Laurel and Hardy | Aug 29, 1991 | Hollywood, CA 90028 | 0.29 | Al Hirschfeld |
| World War II - Arsenal of Democracy & US Declares War | Sep 3, 1991 | Phoenix, AZ 85026 | 0.29 | William Bond |
| World War II - Atlantic Charter & Pearl Harbor | Sep 3, 1991 | Phoenix, AZ 85026 | 0.29 | William Bond |
| World War II - Burma Road & Destroyer Reuben James | Sep 3, 1991 | Phoenix, AZ 85026 | 0.29 | William Bond |
| World War II - First Peacetime Draft & Civil Defense | Sep 3, 1991 | Phoenix, AZ 85026 | 0.29 | William Bond |
| World War II - Lend-Lease Act & First Liberty Ship | Sep 3, 1991 | Phoenix, AZ 85026 | 0.29 | William Bond |
| District of Columbia Bicentennial | Sep 7, 1991 | Washington, DC 20066 | 0.29 | Pierre Mion |
| Jan E. Matzeliger | Sep 15, 1991 | Lynn, MA 01901 | 0.29 | Higgins Bond |
| Space Exploration - Earth & Uranus | Oct 1, 1991 | Pasadena, CA 91109 | 0.29 | Ron Miller |
| Space Exploration - Mars & Pluto | Oct 1, 1991 | Pasadena, CA 91109 | 0.29 | Ron Miller |
| Space Exploration - Mercury & Jupiter | Oct 1, 1991 | Pasadena, CA 91109 | 0.29 | Ron Miller |
| Space Exploration - Moon & Neptune | Oct 1, 1991 | Pasadena, CA 91109 | 0.29 | Ron Miller |
| Space Exploration - Venus & Saturn | Oct 1, 1991 | Pasadena, CA 91109 | 0.29 | Ron Miller |
| Christmas 1991 - Madonna and Child | Oct 17, 1991 | Houston, TX 77201 | 0.29 | Bradbury Thompson |
| Christmas 1991 - Santa Down the Chimney | Oct 17, 1991 | Santa, ID 83866 | 0.29 | John Berkey |
Count: 34
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