| 100% | MAINE | 5 | The only one-syllable US state |
| 78% | MAINE | 5 | The only US state that borders exactly one other |
| 69% | IOWA | 4 | The home state of only one US president |
| 64% | MAINE | 5 | US state that only borders one other state |
| 64% | HAWAII | 6 | The only US state with no straight borders |
| 63% | MAINE | 5 | Only one-syllable state |
| 63% | ARIZONA | 7 | The only US state whose name contains a Z |
| 63% | OHIO | 4 | The only US state with a non-rectangular flag |
| 62% | IOWA | 4 | The only US state whose name starts with two vowels |
| 62% | STATE | 5 | Only one bears the name of a U.S. president |
| 62% | ZEE | 3 | Arizona is the only state to have one |
| 60% | MAINE | 5 | Only one-syllable state name |
| 60% | PATENT | 6 | Lincoln is the only U.S. president to have one |
| 59% | PHD | 3 | Woodrow Wilson is the only U.S. president to have one |
| 59% | PHD | 3 | Woodrow Wilson was the only U.S. prez to have one |
| 59% | PHD | 3 | Woodrow Wilson was the only U.S. president to have one |
| 58% | MAINE | 5 | Only U.S. state to border exactly one other state |
| 58% | OREGON | 6 | One of the five U.S. states without sales tax |
| 55% | AMI | 3 | "___ the only one?" |
| 55% | WVA | 3 | One of two states formed during the U.S. Civil War |
| 54% | WVA | 3 | One of two states formed during the U.S Civil War: Abbr. |
| 54% | MAINE | 5 | The only monosyllabic United States state |
| 54% | ALASKA | 6 | Only U.S. state whose name can be typed on one row of a keyboard |
| 54% | AMI | 3 | "___ the only one?": 2 wds. |
| 54% | AMI | 3 | "___ the only one...?": 2 wds. |
| 54% | BORNONTHEFOURTHOFJULY | 21 | Coolidge: The only one __ |
| 53% | ERE | 3 | "Before" in only one syllable |
| 53% | WEDINTHEWHITEHOUSE | 18 | Cleveland: The only one who __ |
| 53% | THREEVICEPRESIDENTS | 19 | FDR: The only one with __ |
| 53% | RECEIVEAPULITZERPRIZE | 21 | JFK: The only one to __ |