In-N-Out Burger

2235 S Mountain Ave, Ontario
(800) 786-1000

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Double Double Cheeseburger with Fries Doggy Style

Cheese Burger with Grilled Onions and Fries

Double-Double Burger and Fries

Chips and Cheese Animal Style

Cheese Burger and Fries

4x4 Animal Style Fries

Flying Dutchman Burger

French Fries And

3x3 Cheeseburger

Coke Seven-Up

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Recent Reviews

If you're looking for something quick and tasty — this is the spot. The service was fast, the burgers were juicy, and the portions generous. A great option when you're short on time.

August 2025

Burgers tasted really good and fresh more than a lot of other locations. Also super fast service. The employees are very kind and very respectful! Overall a great experience! Thank you! ??

August 2024

Always a great place to eat! Staff is super polite, helpful and food comes out quickly!

Parking: Parking can be tricky but there is always a bunch of spaces. Just pay attention when you walk in the parking lot… some drivers aren’t paying attention.

Kid-friendliness: My kids always asks for stickers and a hat.. great place!

July 2024

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Restaurants in Ontario, CA

In-N-Out Burger

Customers' Favorites

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In-N-Out Burger