Announced earlier today by LDS Church President Thomas S. Monson, the Tucson Arizona Temple will become the Church's sixth temple in Arizona. The Church previously dedicated temples in Mesa (1927), Snowflake (2002), and Gila Valley (2010) and began construction on two new temples in Gilbert (2010) and Phoenix (2011). Currently the Church operates five stakes within Tucson and three additional stakes in southeastern Arizona - all which appear likely to be assigned to the new temple. With today's announcement, Arizona becomes the state with the third most temples after Utah (16) and California (7).
The Church has experienced steady growth in Arizona over the past century and baptizes more new converts in Arizona than most other states. There were only three stakes a century ago whereas today there are now 94. Within the past decade, the Church has created 20 new stakes in Arizona - four of which were YSA stakes organized earlier this year.
A map of stakes and missions in southern Arizona can be found here.