| 100% | POSTMARK | 8 | Ink stamp on an envelope that might identify when and where it was mailed |
| 39% | POSTAGE | 7 | It may be "due" on an envelope without enough stamps |
| 33% | POSTCARD | 8 | Mail that doesn't need an envelope, and where both words of 12-, 20-, 34-, and 51-Across can be found? |
| 33% | OBOE | 4 | Instrument that may be read on a calculator by typing 3080 and turning it upside down |
| 32% | FLAP | 4 | Part of an envelope that may be licked |
| 31% | POSTAGESTAMP | 12 | One might be licked and put on an envelope |
| 31% | SEALED | 6 | Like an envelope that's ready to be mailed |
| 30% | LOVE | 4 | It is "an ever-fixed mark that looks on tempests and is never shaken," per Shakespeare |
| 30% | ADDR | 4 | What's written on an envelope to be mailed: Abbr. |
| 30% | AIRMAIL | 7 | Stamp on an envelope [and 16-Across flipped] |
| 29% | SPEC | 4 | An article might be written on it |
| 29% | SPEC | 4 | An article may be written on it |
| 29% | RAGINGBULL | 10 | Animal that may be on the verge of an attack |
| 29% | SPOT | 4 | Parking ___, place in the car lot where you might be parked, and something that seems impossible to find when you're in a rush |
| 28% | SPA | 3 | Where you may be waited on hand and foot? |
| 28% | AUTO | 4 | An exhausted person might be on it |
| 28% | SOS | 3 | Plea for help that might be spelled out on an island beach |
| 28% | MUSIC | 5 | *Pleasant arrangement of sound that may be heard when an OCTet performs |
| 28% | TIE | 3 | Thing that may be cause for a celebration when it's broken |
| 28% | TAT | 3 | Ink that might be on one's arm, for short |
| 28% | AHA | 3 | It might be heard when a light bulb goes on |
| 28% | DURAG | 5 | It might be on the floor when you wake up |
| 28% | OMAHA | 5 | U.S. city that might be named when calling an audible, in football |
| 28% | SIC | 3 | Word that may be used often when reporting on what the President says |
| 28% | POSTAGEDUE | 10 | Stamp on an envelope without enough stamps |
| 28% | HOTPOCKET | 9 | Microwaveable snack that might be scalding on the outside and frozen on the inside |
| 27% | MAP | 3 | It might be marked with an "X" where buried treasure is located |
| 27% | LEASE | 5 | Break it and you may be out on the street |
| 27% | HOODIE | 6 | Sweatshirt that you might throw on when it's chilly, slangily |
| 27% | LOIN | 4 | Body part that becomes an animal when its vowels are swapped |