In-N-Out Burger

4310 Ontario Mills Pkwy, Ontario
(800) 786-1000

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Double Double Burger Dine in: Yes Outdoor seating: Yes Takeout: Yes Delivery: No

Double Double Cheeseburger Animal Style Fries Strawberry Shake

Cheese Burgers with Grilled Onions and Well Done Fries

Double Double Cheeseburger Animal Style Fries a Drink

Double Double Animal Style and Animal Fries

Animal Style Cheeseburgers w French Fries

Double Double Cheeseburger Protein Style

Double Double Cheeseburger with Fries

Three by Three w Both Kinds of Onions

Protein Style Double Cheeseburger

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Recent Reviews

This is one of the longest lines at a fast food restaurant I've ever been on and there's a reason for it. The burger is just so damn good and for $6 in California?? Its highway robbery for this burger.

Five guys can learn a thing or two about making good burgers from this place.

December 2025

Very basic menu, only a couple choices of great burgers and fries, pop or a home made milkshake which makes it simple and quick . Fast-paced atmosphere, always busy. I'll always swing by for a quick meal when in the area.

July 2025

This is a quick-service restaurant that serves delicious burgers and fries. After ordering and waiting, you will be served a hamburger with freshly fried fries and a baro-gyuun patty. I think it is very good value for money. This is a hamburger restaurant only found in the western part of the United States.

February 2025

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Restaurants in Ontario, CA

In-N-Out Burger

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In-N-Out Burger