| 100% | ZIP | 3 | — code, five- or nine-digit number used by the US postal service |
| 44% | EIN | 3 | IRS 9-digit code used by corporations operating or incorporated in the US (abbr.) |
| 43% | SSN | 3 | Important nine digit number in the US: Abbr. |
| 41% | ZIP | 3 | With 14-Across, five or nine digits at the end of a snail mail address |
| 38% | STAMP | 5 | Elvis Presley Forever ___, tribute to Elvis Presley that was released by the U.S. Postal Service in 2015 |
| 38% | FLYLIKEANEAGLE | 14 | What the U.S. Postal Service used to do (ending in a two under) |
| 37% | ZIP | 3 | Five- or nine-digit snail mail code: Abbr. |
| 37% | UPS | 3 | Private alternative to the US Postal Service |
| 37% | UZI | 3 | "Gun in a briefcase" once used by the US Secret Service VIP section |
| 37% | LTR | 3 | Something sent via the US Postal Service: Abbr. |
| 35% | AREA | 4 | ___ code (three digits that begin a phone number in the US or Canada) |
| 35% | GRS | 3 | Synthetic substitute for natural rubber used by the US during WWll |
| 35% | CHERAMI | 7 | Male homing pigeon used by the U.S. Army in WWI |
| 33% | BASESIXTY | 9 | Number system used by the Babylonians |
| 33% | ASL | 3 | US language used by the Deaf community |
| 33% | NOR | 3 | Conjunction in the U.S. Postal Service motto |
| 33% | EAGLE | 5 | Bird in the U.S. Postal Service logo |
| 33% | NOR | 3 | Word in the U.S. Postal Service motto |
| 32% | NOR | 3 | Repeated word in the U.S. Postal Service creed |
| 32% | MAILS | 5 | Uses the postal service, say |
| 32% | THREECENTPIECES | 15 | Lightest coins ever minted by the U.S., used in the late 19th century |
| 32% | GAS | 3 | It's sold by the gallon at US service stations |
| 32% | TWO | 3 | Number of different digits used in binary code |
| 31% | SLRS | 4 | Reporting mark used by the shortline outfit that services Pureland Industrial Park in Bridgeport, NJ |
| 31% | VANS | 4 | Vehicles used by some delivery services, or a brand of sneakers |
| 31% | LNES | 4 | Code used by the International Civil Aviation Organization to identify Vanuatu's Lonorore Airport |
| 31% | TWO | 3 | Number in the middle of five Beverly Hills zip codes |
| 31% | AREA | 4 | ___ code (first three digits in a US phone number) |
| 30% | SUDOKU | 6 | Puzzle grid using the numbers one to nine |
| 30% | BUTTONS | 7 | Song by The Pussycat Dolls or things to use for a snowman's eyes |