As of May 31, 2018, there are 3,589 restaurants (3,410 franchised and 179 company-operated) in 45 states.

In fiscal 2017, the company opened 3, closed 3 and sold 117 net drive-ins to franchisees, while franchisees also opened 63 and closed 27 drive-ins. During the first nine months of fiscal 2018, the company sold 49 locations to franchisees, and franchisees closed 4 net stores. In the third quarter of fiscal 2016, the company announced plans to move toward an approximately 95% franchised system as part of a refranching initiative. Additionally, the company expects 70 to 80 new franchise drive-ins to open by the end of fiscal 2018.
At year end, the company operated 98 of their stores on property leased from third parties and 130 of them on property they own. The company also owns and leases 135 properties and subleases 53 properties to franchisees and other parties.

Sonic Drive-Ins typically consist of a kitchen housed in a one-story building, approximately 1,500 square feet, flanked by canopy-covered rows of 16 to 24 parking spaces. Each parking spot has its own payment terminal, intercom speaker and menu board.

Company-operated restaurants179228345387391396
Company-operated restaurant growth-22.2%-33.9%-10.9%-1.0%-1.3%-3.2%
Franchised restaurants3,4103,3653,2123,1393,1273,126
Franchised restaurant growth2.1%4.8%2.3%0.4%0.0%-0.7%
Systemwide restaurants3,5893,5933,5573,5263,5183,522
Systemwide restaurant growth0.5%1.0%0.9%0.2%-0.1%-1.0%
Avg restaurant gross sq ft1,5001,5001,5001,5001,5001,500
Avg restaurant gross sq ft growth0.0%0.0%0.0%0.0%0.0%0.0%