A moose population survey was conducted on the Yukon Flats in November/December 2018. This was the first fall survey since 2015. Moose were counted in 97 of 421-5.3mi2 units, of which 63 were stratified high moose density and 34 low moose density. The estimate for the 2,269 mi2 survey area in the western Yukon Flats (Alaska Game Management Unit [GMU] 25D) was 1123 total observable moose (95% CI; 895-1351). Density of moose was 0.49/mi2 or 0.19/km2. The population was comprised of an estimated 908 adults (95% CI; 698-1118) and 199 calves (148-251). Search time averaged 6.0 minutes/mi2. The estimate of total observable moose increased from the lows of 2004-2010. Improved calf survival may have contributed to the population increase in some years. It is unlikely that public harvest of wolves and bears contributed, as harvest intensity is light. Thus, moose density increased in the presence of lightly harvested wolf and bear populations, suggesting that the dynamics of this low density population may sometimes be more complex than previously thought. Moose numbers can fluctuate naturally within a low density equilibrium over a period of approximately a decade, and this fluctuation can be detected with the current survey method.