The ethnic hazara area in Ghazni province has low population density as it is central Afghanistan, while pashtun area is more fertile, therefore more population density...here is a study of UNHCR which shows the ethnic breakdown of the province.
"Tajiks form a major portion of the population in the northern woleswalis of Khwaja Omari, northern Jaghatu, Deh Yak, Andar and Qarabagh. 'Ihe Maco Khel (Durrani Pushtun) are in Khwaja Omari and the Jalozai in Waghaz. Ghilzai Pushtun are the dominant group in the centre and south. 'Ihe Ghilzai Andar are in Andar, Deh Yak, Qarabagh and Giru, and their sub-tribe, the SUleiman Khel, in Deh Yak, Moqor and Waghaz (Ghazni centre) • 'Ihe Ghilzai Taraki are in Ab Band, Gelan, Moqor, and some in Giru. Other Ghilzai tribes are: Mir Khel and Girdar Khel in Zena Khan; Nasir and Khattack in Nawa; nomads in Andar and Qarabagh (rut also migrating to the Hazarajat); some Kharoti in Giru. Hazaras are the dominant group in the west. Ihe Niazis, once an exceedingly powerful tribe in the Shilgar area of Ghazni, have been scattered due to feuds with the Andars and to their area being too small to support them. Niazi moved eastwards in the direction of the Indus as far as Mianwali where their descendants still live. Niazis remaining in Ghazni are usually nomads and are chiefly camel breeders."
http://afghandata.org:8080/jspui/bitstream/azu/3323/1/azu_acku_pamphlet_ds374_g53_g53_1990_w.pdf
Based on the above and the fact that Hazara dominates; Hazarajat (Obviously) it is concluded that Hazara are majority in the west, while Pashtuns dominate Center, East and South and Tajiks are scattered in the North and the Capital.
