| Language | Comments | Speakers | Source |
| Achumawi language | | 10 nonfluent speakers 1,000. | |
| Alutiiq language | | 30 speakers 1,000. | |
| Ahtena language | | 80 500. | |
| Kiowa Apache language | | 18 1,000. | |
| Lipan Apache language | | 2 or 3 100. | |
| Arikara language | | 20 3,000. | |
| Atsugewi language | | 3 200 1,350 with Achumawi. | |
| Caddo language | | 25 3,371. | |
| Cahuilla language | | 7 to 20 35. | |
| Chetco language | | 5 100 possibly. | |
| Cheyenne language | | | |
| Chinook language | | 12 speakers of Kiksht dialect 300 possibly. | |
| Chinook Wawa language | | 17 in the US. | |
| Clallam language | | 10 Several thousands. | |
| Coeur d'Alene language | | 5 800. | |
| Comanche language | | less than 130 | |
| Coos language | | 1 or 2 250. | |
| Degexit'an language | | 20 to 30 250 to 300. | |
| Gros Ventre language | | 10 Very few semispeakers in 2000 1,200. | |
| Northern Haida language | | 15 in the US 600 in the US. | |
| Hän language | | 7 or 8 in Alaska Population total all countries: 14 300. | |
| Hawai'i Sign Language | | A few users out of about 6,000 profoundly deaf people in Hawaii, 72,000 deaf or hard-of-hearing people in Hawaii. | |
| Holikachuk language | | 12 200. | |
| Hupa language | | 8 2,000. | |
| Kalapuya language | | 1 or 2. | |
| Kansa language | | 19 250. | |
| Karok language | | 10 1,900. | |
| Kashaya language | | 45. | |
| Kawaiisu language | | 8 to 10 35. | |
| Klamath-Modoc language | | 1 2,000. | |
| Upper Kuskokwim language | | 40 3 households 160. | |
| Kutenai language | | 6 in the US. | |
| Louisiana Creole language | | 9,600. | |
| Louisiana French language | | 150,000 to 200,000. | |
| Luiseño language | | 30 to 40 2,000. | |
| Lushootseed language | | 60 Population evenly divided between the northern and southern dialects 2,000. | |
| Northeast Maidu language | | 1 to 2 108. | |
| Northwest Maidu language | | 3 to 6 200. | |
| Mandan language | | 6 400. | |
| Menominee language | | 39 . | |
| Central Sierra Miwok language | | 12 Population includes 6 Eastern Central Sierra, 6 Western Central Sierra Possibly 5,000 all Miwok. | |
| Lake Miwok language | | 1 to 2. | |
| Northern Sierra Miwok language | | 6. | |
| Plains Miwok language | | 1. | |
| Southern Sierra Miwok language | | 7 Southern Central Sierra Miwok. | |
| Mono language | | Western Mono: 37 to 41 Population includes 10-12 North Fork, 15 Auberry, 7-8 Big Sandy, 5-6 Dunlap, no Waksachi. Eastern Mono: 50 600. | |
| Nisenan language | | 1. | |
| Osage language | | 5 15,000. | |
| Panamint language | | 20 100. | |
| Pawnee language | | 20 2,500. | |
| Plains Sign Talk | | | |
| Central Pomo language | | 2 to 5 4,766. | |
| Southeastern Pomo language | | 5. | |
| Southern Pomo language | | 1. | |
| Quapaw language | | 34 2,000. | |
| Quileute language | | 10 300. | |
| Straits Salish language | | | |
| Serrano language | | 1. | |
| Snohomish language | | 10 800. | |
| Tanacross language | | 35 Population includes 3 in the Healy Lake dialect, 32 in Mansfield-Ketchumstuck 120. | |
| Tanaina language | | 75 900. | |
| Lower Tanana language | | 30 380. | |
| Tolowa language | | 4 to 5 1,000. | |
| Tübatulabal language | | 6 900. | |
| Tuscarora language | | 4 to 5 in the US 1,200 in the US. | |
| Tututni language | | 10. | |
| Wasco-Wishram language | | 69 7 monolinguals 750 possibly. | |
| Washo language | | 10 1,500. | |
| Wichita language | | 3 1,400. | |
| Wintu language | | 5 or 6 2,244 | |
| Yokutsan languages | | 78 speakers of Northern Foothill Yokuts 2,500. | |
| Yuchi language | | 10 to 12 1,500. | |
| Yurok language | | 12 3,000 to 4,500 possibly. | |