| 100% | IOWA | 4 | Only state whose west and east borders are formed entirely by rivers |
| 63% | IOWA | 4 | Its east and west borders are formed entirely by rivers |
| 63% | IOWA | 4 | Only state whose entire east and west borders are rivers |
| 52% | IOWA | 4 | Its eastern and western borders are formed entirely by rivers |
| 46% | IOWA | 4 | State whose eastern border is formed by the Mississippi River |
| 39% | ELBE | 4 | River that formed part of the border between East and West Germany |
| 36% | IDAHO | 5 | Only state whose seal was designed by a woman |
| 35% | IDAHO | 5 | Only state whose seal was designed by a woman (Emma Edwards Green, 1891) |
| 35% | ORE | 3 | State whose northern border is the Columbia River (Abbr.) |
| 33% | ZAMBEZI | 7 | River that is bordered by Zambia and Zimbabwe |
| 33% | BISMARCK | 8 | State capital whose site was visited by Lewis and Clark |
| 31% | LAOS | 4 | Asian country bordered on the east and west by Vietnam and Thailand |
| 30% | DOURO | 5 | River that forms part of the border between Spain and Portugal before flowing west to the Atlantic |
| 29% | ORION | 5 | Constellation whose belt is formed by the stars Alnitak, Alnilam, and Mintaka |
| 28% | IDAHO | 5 | State whose southern neighbors are Nevada and Utah |
| 28% | OHIO | 4 | State whose northern border is mostly Lake Erie |
| 28% | IDA | 3 | State whose eastern neighbors are Montana and Wyoming: Abbr. |
| 28% | IDA | 3 | State whose southern neighbors are Nevada and Utah: Abbr. |
| 28% | IOWA | 4 | State whose senators are Chuck Grassley and Joni Ernst |
| 28% | UTAH | 4 | State whose second-biggest city is West Valley City |
| 28% | ALASKA | 6 | Only state that is crossed by the Arctic Circle |
| 28% | YSER | 4 | WWI battle named after the river where the German Army was obstructed by opening sluices and flooding land to the west |
| 27% | SONORA | 6 | State bordered by the Colorado River |
| 27% | IOWA | 4 | State bordered by Minnesota and Missouri |
| 27% | VERACRUZ | 8 | State bordered by Oaxaca and Tabasco |
| 27% | OHIO | 4 | State that borders West Virginia and Michigan |
| 27% | ASSAM | 5 | State that borders Nagaland and West Bengal |
| 27% | SANTEE | 6 | River formed by the Congaree and Wateree |
| 27% | OREO | 4 | Treat whose name can be formed by concatenating a Cirque du Soleil show and a car |
| 27% | ALA | 3 | State bordered by Mississippi and Georgia: Abbr. |