Endemic to NSW from around the Budawang Range in the north down to near Mount Coricudgy where it is found scattered on tablelands growing in sandy soils as a part of dry sclerophyll forest communities. It is common in the western Blue Mountains from around Braidwood to Tumut.
https://keys.lucidcentral.org/keys/v3/plants_se_nsw/key/plants_se_nsw/Media/Html/entities/acacia_obtusata.htm
Acacia obtusata is listed in the following regions:
Canberra & Southern Tablelands | Southern Highlands | South Coast | Riverina Murray