Answer:
The Australian city located north of the 15°S latitude is Darwin.
Step-by-step explanation:
15°S latitude parallel passes through the northernmost edge of Australia. The only Australia city located north of it is the city of Darwin.
Darwin is the capital and most populous city of the Northern Territory, Australia. Located next to the Timor Sea, it is located on the northern coast of the country and has a population of 146,000 inhabitants, thus becoming the largest city of the sparsely populated Northern Territory but in the least populated of all Australian capital cities.