Population of the Larger Urban Areas: For Hamadan and Wasit. Estimates by Colin McEvedy for 737 AD. These should be taken with grain of salt as a lot of these are underestimates.
Vici.org: For Zaranj. Estimated area size at 100 ha. Density of 200/ha used.
Wikipedia - Susa: For Shush. Estimated area size at 400 ha. Pre-Islamic city in decline, density of 100/ha used.
4000 Years of Urban Growth: An Historical Census: For a large portion of population estimates.
Early Medieval Central Asian Population Estimates: For Yarkand and Hotan.
Late ancient and medieval population: For Ankara.
Modernization Theory and House Garden Transformation; Erbil City as Case Study: For Erbil. Estimated area size of the second stage at 125 ha. Density of 200/ha used.
Vici.org: For Zaranj. Estimated area size at 100 ha. Density of 200/ha used.
Wikipedia - Susa: For Shush. Estimated area size at 400 ha. Pre-Islamic city in decline, density of 100/ha used.
The Archaeology of Byzantine Anatolia: For İznik (Nicaea). Housing area size at 100 ha. Density of 200/ha used.