| 100% | UTAH | 4 | Where the first transcontinental railroad was completed |
| 80% | UTAH | 4 | Where the U.S.'s first transcontinental railroad was completed (1869) |
| 52% | GOLDENSPI | 9 | Finishing touch on the first transcontinental railroad |
| 49% | WISCONSIN | 9 | Where the first Ringling Brothers circus was staged, 1884 |
| 49% | EDEN | 4 | Where the first humans were, according to the Bible |
| 49% | IOWA | 4 | Where the first presidential caucuses are held |
| 49% | GOBI | 4 | Where the first velociraptor fossil was discovered (1923) |
| 48% | ATHENS | 6 | City where the first modern Olympic games were held |
| 47% | ESTONIA | 7 | Where the first five counting numbers are "üks kaks kolm neli viis" |
| 47% | ALA | 3 | Where the Confederate flag was first flown: Abbr. |
| 47% | HERBGARDEN | 10 | Where the first words of 17-, 26- and 47-Across may be found |
| 47% | OSLO | 4 | Olympics locale where the first figure-skating triple jump was landed |
| 46% | PASADENA | 8 | California city where the first 15-Across was played |
| 46% | WATTPAD | 7 | Site where The Kissing Booth was first published |
| 45% | ASIA | 4 | Where the Olympics were held for the first time in 1964 |
| 45% | MECCA | 5 | Site where the Quran was first revealed to Muhammad |
| 45% | BERLIN | 6 | German city where the first United Nations Climate Change Conference was held in 1995 |
| 45% | ELDORADO | 8 | The first complete navigation of the Amazon was in search of this |
| 45% | ACTS | 4 | Where the word "Christian" is first used in the Bible |
| 44% | UCLA | 4 | SoCal school where the world's first internet transmission was made |
| 44% | VINE | 4 | App where the "I Smell Like Beef" video was first posted |
| 44% | LOSALTOS | 8 | California city where the first Apple computer was built |
| 44% | LEEDS | 5 | European city where the first carbonated beverage was invented |
| 44% | CHAMONIX | 8 | French resort where the first Winter Olympics were held |
| 44% | ONTHELINE | 9 | In jeopardy ... and where the first words of the answers to starred clues can be found |
| 42% | ONAUTO | 6 | Running by itself, and where the first words of 17-, 35-, 42- and 64-Across can be placed |
| 42% | EGYPT | 5 | Where the use of urine-based pregnancy tests was first recorded, circa 1350 B.C.E. |
| 42% | SWITZERLAND | 11 | Guess where the first cheese factory was established in 1815? Hint: Zurich's country |
| 42% | OTERO | 5 | New Mexico county where the first atomic bomb was exploded |
| 42% | RIGHTOFCENTER | 13 | Somewhat conservative, politically ... and where the first word of 17-, 31-, 43- and 60-Across can literally be found |