Headquartered in San Diego County since its 1951 founding, Jack in the Box pioneered the drive-thru restaurant model and now operates more than 2,200 locations across the western United States. This OB outpost at 4815 Voltaire St runs the full all-day menu—Jumbo Jack, Sourdough Jack, tacos, egg rolls, breakfast platters—on the eastern Voltaire corridor where quick-serve options thin out compared to Newport Ave, a stretch where Plant Power Fast Food offers a fully plant-based counter-alternative. The menu's unusual breadth—spanning burgers, chicken, Mexican-inspired items, and breakfast in a single kitchen—remains the chain's defining trait against more specialized competitors. Active military discounts apply at this location. Late-night taco and burger runs serve the same after-hours crowd that lines up at Nico's Mexican Food elsewhere in OB, though the drive-thru window here handles volume without a walk-up wait. The largest combo builds top out at multi-burger bundles with curly fries and shakes, covering group orders through the drive-thru without requiring a dine-in footprint.