At the beginning of the 20th century, it reportedly had an area of 29,220 square miles (75,700 km2), while the preliminary results of the first Ottoman census of 1885 (published in 1908) gave the population as 300,280.[4] The accuracy of the population figures ranges from "approximate" to "merely conjectural" depending on the region from which they were gathered.[4]
A map showing the administrative divisions of the Ottoman Empire in 1317 Hijri, 1899 Gregorian, Including the Vilayet of Mosul and its Sanjaks.Map of subdivisions of Mosul Vilayet in 1907