| 3.50, e.g. | 10 |
| 3.7 and 4.0, e.g. | 17 |
| 3.7 x 10 to the 10th power disintegrations per second, to a physicist | 69 |
| 3.75 e.g. | 10 |
| 3.75 feet, once | 15 |
| 3.75, e.g. | 10 |
| 3.8 is a good one | 17 |
| 3.9 is a good one | 17 |
| 3.9, e.g. | 9 |
| 3.9, e.g.: Abbr. | 16 |
| 3/15 but not 1/5 | 16 |
| 3/15, e.g. | 10 |
| 3/17 honoree | 12 |
| 3/17 honoree, for short | 23 |
| 3/17 musicmaker | 15 |
| 3/17 symbol | 11 |
| 3/28/79 Pa. meltdown site | 25 |
| 3/4 of a dozen | 14 |
| 3/4 of a thousand? | 18 |
| 3/4 of an hour? | 15 |
| 3/4 teaspoon ... | 16 |
| 3/4 teaspoon .... | 17 |
| 3/4 time concert pieces (Fr.) | 29 |
| 3/4 time dances | 15 |
| 3/4, colloquially | 17 |
| 3/4-time dances | 15 |
| 30 ... (when completed, a Hitchcock movie)(with ''The'') | 72 |
| 30 days | 7 |
| 30 minutes after the NYSE opens | 31 |
| 30 minutes of football | 22 |
| 30 minutes of NFL football | 26 |
| 30 minutes, for a Jet | 21 |
| 30 minutes, in the N.F.L. | 25 |
| 30 minutes, in the NFL | 22 |
| 30 Rock letters | 15 |
| 30 Rock occupant | 16 |
| 30 Rock tenant | 14 |
| 30 Rock's architectural style | 33 |
| 30 Rock's style | 19 |
| 30 Seconds to Mars "This ___" | 39 |
| 30 Seconds to Mars frontman Jared | 33 |
| 30 Seconds to Mars lead singer Jared | 36 |
| 30 Seconds to Mars Shannon | 26 |
| 30 Seconds to Mars singer Jared | 31 |
| 30 Seconds to Mars singer/actor Jared | 37 |
| 30 Seconds to Mars' Jared | 29 |
| 30 Seconds to Mars' Shannon | 31 |
| 30 Seconds to Mars' Shannon or Jared | 40 |
| 30 SPF lotion, e.g. | 19 |
| 30 to 300 MHz range | 19 |
| 30 U.S. states have one named Washington | 40 |
| 30% of dieci | 12 |
| 30% of the average one-hour TV show | 35 |
| 30% of the world | 16 |
| 30% of the world's land | 27 |
| 30% of venti | 12 |
| 30's actress Grey and others | 32 |
| 30's agcy. | 14 |
| 30's and 40's actress Anna | 34 |
| 30's boxing champ Max | 25 |
| 30's chess champ Max | 24 |
| 30's crooner Columbo | 24 |
| 30's home run king | 22 |
| 30's Interior Secretary | 27 |
| 30's leading lady Farrell | 29 |
| 30's migrant | 16 |
| 30's movie dog | 18 |
| 30's singer MacDonald | 25 |
| 30's-40's bandleader Kay | 32 |
| 30's-40's pianist Templeton | 35 |
| 30's-50's Arab ruler | 28 |
| 30, for 1/5 and 1/6, e.g.: Abbr. | 32 |
| 30, in the newsroom | 19 |
| 30,000-employee insurance company | 33 |
| 30- or 60-second spot | 21 |
| 30-0, e.g. | 10 |
| 30-30 | 5 |
| 30-300 MHz | 10 |
| 30-40, say, in a tennis game | 28 |
| 30-day mo. | 10 |
| 30-day month | 12 |
| 30-day period | 13 |
| 30-day span: Abbr. | 18 |
| 30-day spring mo. | 17 |
| 30-day trial versions, e.g. | 27 |
| 30-day winter month | 19 |
| 30-footer | 9 |
| 30-mile-per-hour runners | 24 |
| 30-miles-per-hour runners | 25 |
| 30-second spot, e.g. | 20 |
| 30-second spots | 15 |
| 30-second spots, e.g. | 21 |
| 30-something on the BMI scale | 29 |
| 30-stock stat. | 14 |
| 30-ton computer | 15 |
| 30-ton military brain | 21 |
| 30-year late-night host | 23 |
| 30-year-old NBC show | 20 |
| 30-___ (tennis score) | 21 |
| 30.48 centimeters | 17 |