There are currently seven Starbucks locations in Denton. The most recent opening is the one located near Walmart on University/380. It opened in September of 2012. The first 100 people to be at that store's opening got a voucher for 52 free grande drinks.
The seven locations are as follows (in no particular order):
Rayzor Ranch (by Walmart on University Dr / 380):
Has a drive-thru, free Wi-Fi, and indoor/outdoor seating. This is probably the most spacious Denton location.
2320 University Drive
Has Wi-Fi and indoor seating. Small location.
401 W University Dr
Loop 288 / I-35
Has WiFi and indoor/outdoor seating
2300 S LOOP 288
There are three Krogers that have a Starbucks in it. They all offer no seating or Wi-Fi.
500 W University, 1592 Texas 288 Loop, and 5021 Teasley Lane.
There is a Starbucks location within the Super Target on 288. I think they have seating. No Wi-Fi.
1801 S Loop 288
For more information, here the official Starbucks website with all the Denton locations. If you want to know more about a location, just click on it.