The distribution range extends inland from the northern coast of the continent, from the Kimberley region in Western Australia across the Top End and narrowly extending to a wider range at tropical regions at the east of Cape York.
The population in Queensland is geographically isolated from others by an environmental barrier below the gulf of Carpentaria, and a second and third clade are weakly distinguishable in the Northern Territory and Kimberley.

The habitat preferred by O. antilopinus is tropical, with perennial grasses providing forage, in vegetation occurring over lower hills and plains.
The grasslands of its habitat are found in association with monsoonal eucalypts, as open or regenerating woodlands, or as the dominant vegetation of unwooded plains.
They are only found at altitudes less than 500 metres.
The species is locally common in parts of the wide range, but these groups occur in a patchy distribution within this area.
The distribution range extends inland from the northern coast of the continent, from the Kimberley region in Western Australia across the Top End and narrowly extending to a wider range at tropical regions at the east of Cape York. The population in Queensland is geographically isolated from others by an environmental barrier below the gulf of Carpentaria, and a second and third clade are weakly distinguishable in the Northern Territory and Kimberley.
The habitat preferred by O. antilopinus is tropical, with perennial grasses providing forage, in vegetation occurring over lower hills and plains. The grasslands of its habitat are found in association with monsoonal eucalypts, as open or regenerating woodlands, or as the dominant vegetation of unwooded plains. They are only found at altitudes less than 500 metres. The species is locally common in parts of the wide range, but these groups occur in a patchy distribution within this area.
Antilopine kangaroo