Focusing on the higher volume zips (with 100 or more active listings), the most active zip code seems to be 85710 with 105 listings and 72 sold in July, for a 68.57% sales rate. 85710 is on Tucson's East side, bounded roughly by Golf Links and Speedway on the South and North, and Wilmot and Harrison on the West and East.
The lowest turnover of the zip codes with 100 or more listings is 85658 which is on the far Northwest side, incorporating the part of Marana north of Tangerine, East of I-10 and including the Dove Mountain area. The sales rate in July for that zip code was just shy of 17% in July.
For more details and a full copy of the July sales statistics go to July Tucson Sales Stats