The US is a weird place. A weird place that has a lot of weird folklore, urban legends, and cryptids running about.
It's also a weird place that has fifty states, which means you can easily make a random encounter table with one monster from each state pretty easily:
| d100 | Monster |
| 1-2 | Monster Pig (Alabama) |
| 3-4 | Kushtaka (Alaska) |
| 5-6 | The Mogollon Monster (Arizona) |
| 7-8 | The Fouke Monster (Arkansas) |
| 9-10 | Big Foot (California) |
| 11-12 | Slide-Rock Bolter (Colorado) |
| 13-14 | Melon Heads (Connecticut) |
| 15-16 | Primehook Swamp Creature (Delaware) |
| 17-18 | Skunk Ape (Florida) |
| 19-20 | Altamaha-ha (Georgia) |
| 21-22 | Menehune (Hawaii) |
| 23-24 | The Bear Lake Monster (Idaho) |
| 25-26 | Tuttle Bottoms Monster (Illinois) |
| 27-28 | Green Clawed Beast (Indiana) |
| 29-30 | Monster Turtle of Big Blue (Iowa) |
| 31-32 | Beaman (Kansas) |
| 33-34 | Hopkinsville Goblins (Kentucky) |
| 35-36 | Rougarou (Louisiana) |
| 37-38 | Maine Mystery Beast (Maine) |
| 39-40 | Goatman (Maryland) |
| 41-42 | Dover Demon (Massachusetts) |
| 43-44 | Michigan Dogman (Michigan) |
| 45-46 | Wendigo (Minnesota) |
| 47-48 | Pascagoula Aliens (Mississippi) |
| 49-50 | Momo (Missouri) |
| 51-52 | Flathead Lake Monster (Montana) |
| 53-54 | Alkali Lake Monster (Nebraska) |
| 55-56 | Tahoe Tessie (Nevada) |
| 57-58 | Grays (New Hampshire) |
| 59-60 | Jersey Devil (New Jersey) |
| 61-62 | Spring-Heeled Jack (New Mexico) |
| 63-64 | Montauk Monster (New York) |
| 65-66 | North Carolina Sewer Monster (North Carolina) |
| 67-68 | Thunderbird (North Dakota) |
| 69-70 | Loveland Frog (Ohio) |
| 71-72 | Oklahoma Octopus (Oklahoma) |
| 73-74 | Colossal Claude (Oregon) |
| 75-76 | Green Man (Pennsylvania) |
| 77-78 | Mercy Brown (Rhode Island) |
| 79-80 | Lizard Man of Scrape Ore Swamp (South Carolina) |
| 81-82 | Taku-He (South Dakota) |
| 83-84 | Bell Witch (Tennessee) |
| 85-86 | Black-Eyed Children (Texas) |
| 87-88 | Skinwalker (Utah) |
| 89-90 | Champ (Vermont) |
| 91-92 | Bunny Man (Virginia) |
| 93-94 | Batsquatch (Washington) |
| 95-96 | Mothman (West Virginia) |
| 97-98 | Beast of Bray Road (Wisconsin) |
| 99-100 | San Pedro Mountains Mummy (Wyoming) |