Ngukurr Language Centre https://ngukurrlc.org.au/
Speaker numbers were measured differently across the censuses and various other sources listed in AUSTLANG. You are encouraged to refer to the sources.
Speaker numbers for ‘NILS 2004’ and ‘2005 estimate’ come from 'Table F.3: Numbers of speakers of Australian Indigenous languages (various surveys)' in 'Appendix F NILS endangerment and absolute number results' in McConvell, Marmion and McNicol 2005, pages 198-230 (PDF, 2.5MB).
Baker, Brett. 2008. Word structure in Ngalakgan. Chicago: The University of Chicago Press (revised PhD thesis).
Baker, Brett. 1999. Word structure in Ngalakgan, University of Sydney (PhD). ASEDA 0704.
Merlan, Francesca. 1983. Ngalakan grammar, texts and vocabulary: Pacific Linguistics B89. Canberra: Pacific Linguistics.