| Stamp | EKU date | City(s) postmark of EKU | Official First Day |
| 33¢ Year of the Hare | December 31, 1998 | Unknown | |
| 33¢ Malcolm X | January 16 | Prov., RI | January 20 |
| 33¢ Victorian Love | January 22 | Gary, IN | January 28 |
| 33¢ Hospice Care | February 8 | Savannah, GA | February 9 |
| 20¢ Washington & Lee University stamped card | February 9 | Chicago, IL | February 11 |
| 33¢ City Flag
(PSA CB of 20) |
February 19 | Santa Clarita, CA | February 25 |
| 33¢ City Flag
(PSA pane of 20) |
February 22 | Leominster, MA | February 25 |
| 33¢ City Flag (PSA Vending Bk of 15) | Jan 28 | Unknown | February 25 |
| 33¢ City Flag (PSA Folded bk of 20) | February 22 | Washington, DC | February 25 |
| 33¢ Irish Immigration | February 20 | Milwaukee, WI | February 26 |
| 33¢ Alfred Lunt & Lynn Fontanne | February 27 | New York, NY | March 2 |
| 33¢ Sonoran Desert | March 24 | Portsmouth, NH | April 6 |
| 33¢ Fruit Berries (vending bk of 15) | March 2 | North Texas MPC, TX | April 10 |
| 33¢ Fruit Berries (coil of 100) | April 3 | Cincinnati, OH | April 10 |
| 33¢ Daffy Duck | April 9 | Bear, DE | April 16 |
| 33¢ Ayn Rand | March 27 | Los Angeles, CA | April 22 |
| 33¢ Cinco de Mayo | April 3 | North Bay, CA | April 3 |
| 33¢ Tropical Flowers | April 23 | Suburban, MD | May 1 |
| 20¢ Mt. Vernon Estate & Garden stamped card | May 8 | NO, VA
Baltimore, MD Southern, MD |
May 14 |
| 33¢ John & William Bartram | May 13 | Windsor, CA | May 18 |
| 33¢ Celebrate the Century 1950s | May 18 | Suburban, MD | May 26 |
| 33¢ Prostate Cancer Awareness | May 25 | Westchester, NY | May 28 |
| 33¢ California Gold Rush | June 12 | Crown Point, IN | June 18 |
| 33¢ Aquarium Fish | June 22 | Dallas, TX | June 24 |
| 33¢ American Glass | June 22 | Woodstock, GA | June 29 |
| 55¢ Justin S. Morrill | July 13 | Gainsville, FL | July 17 |
| 40¢ Rio Grande | June 14 | Los Osos, CA | July 30 |
| 55¢ Billy Mitchell | June 30 | Carol Strem, IL | July 30 |
| 33¢ Coral Pink Rose (PSA CB of 20) | August 1 | SCF Southern MD | August 13 |
| 33¢ Honoring Those Who Served | August 13 | North Sta. Arlington, VA | August 16 |
| 45¢ Universal Postal Union | August 11 | Savannah, Georgia | August 25 |
| 33¢ All Aboard! stamps | August 20 | Chicago, IL | August 26 |
| 20¢ All Aboard! cards | August 3 | Savannah, GA | August 26 |
| 33¢ Frederick Law Olmsted | August 31 | Sacramento, CA | September 12 |
| Celebrate the Century 1960s | September 15 | Ely, NV | September 17 |
| 33¢ Broadway Songwriters | September 18 | Quad Cities, IL | September 21 |
| 33¢ Insects & Spiders | September 28 | Knoxville, TN | October 1 |
| 33¢ NATO | May 6 | Cleveland, OH | October 13 |
| 33¢ Kwanzaa | October 22 | Trenton, NJ | October 27 |
| Celebrate the Century 1970s | November 15 | North Sta. Arlington, VA | November 18 |
| 1¢ PSA American Kestrel | November 13 | Dayton, OH Washington BR | November 19 |
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