Lyle Campbell et al. (2007) list the following extinct and nearly unattested language varieties of North America as unclassifiable due to lack of data.

• Eyeish
• Coree
• Sewee
• Cusabo
• Shoccoree-Eno (see Eno people)
• Pascagoula
• Quinipissa
• Opelousa
• Pedee
• Bayogoula
• Okelousa
• Congaree
• Winyaw (see Winyaw)
• Santee (see Santee tribe; distinguish Santee Sioux)
• Okchai-Chacato (see Okchai, Chatot people)
• Tequesta
• Guale
• Sanan
• Yamasee
• Akokisa
• Avoyel
• Tocobaga (see Tocobaga)
• Houma
• Neusiok (see Neusiok people)
• Ubate
• Cape Fear
• Pensacola (see Pensacola people)
• Bidai
• Wateree (see Wateree people)
• Mobile
• Michigamea
• Pakana
• Saxapahaw
• Keyauwee
• Guachichil^†
• Suma-Jumano^† (see Suma & Jumanos)
• Huite^†
• Concho^†
• Jova^†
• Acaxee^† (see Acaxee)
• Xixime (Jijime)^†
• Zacatec^† (see Zacatecos; perhaps the same as Acaxee)
• Tahue^†
• Guasave^†
• Toboso^† (see Tobosos)

† Ethnographic evidence suggests these varieties might have been Uto-Aztecan.^[1] See Uto-Aztecan languages § Extinct languages for more.

• Category:Unclassified languages of North America
• List of extinct languages of North America
• Uto-Aztecan languages#Extinct languages
• Languages of North America

• Zamponi, Raoul (2024). "Unclassified languages". The Languages and Linguistics of Indigenous North America. De Gruyter. pp. 1627–1648. doi:10.1515/9783110712742-061. ISBN 978-3-11-071274-2.