

McDonald’s USA, LLC, serves a variety of menu options made with quality ingredients to millions of customers every day. Ninety-five percent of McDonald’s approximately 13,500 U.S. restaurants are owned and operated by independent business owners. For more information, visit www.mcdonalds.com, and follow us on social: X, Instagram, TikTok and Facebook.
Classic, long-running fast-food chain known for its burgers & fries.
Hours
| Friday | Open 24 hours |
| Saturday | Open 24 hours |
| Sunday | Open 24 hours |
| Monday | 5 AM–12 AM |
| Tuesday | 5 AM–12 AM |
| Wednesday | 5 AM–12 AM |
| Thursday | Open 24 hours |
Address and Contact Information
Address: 205 S Diamond Bar Blvd, Diamond Bar, CA 91765
Phone: (909) 861-2624
Menu Photos
Order and Reservations
Order: Order online
Photo Gallery
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Reviews
Diamond Bar
I ordered two Happy Meals, one McCrispy medium combo, and a 10-piece Chicken McNuggets.
When I got home, I found a long hair inside one of my son’s Happy Meal chicken nuggets.
This is extremely gross and unacceptable, especially since it was for my child.
I did not take the receipt, but I paid at the drive-thru around that time.
Please advise how this can be resolved.
Gave half of my order to someone they not supposed to gave
I order curbside pick up they let random people took one of my drink and let an other drink sitting inside do nothing. For real?
Contacted corporate who forwarded my issue to the store. After a week, a rep reached out. I show them my screenshot with my order info and they told me again I placed my order at a different location. My screenshot has their address… they couldn’t explain why their staff couldn’t simply remake my order and have stopped communication.
8/24/25 Edit/ response to MCD. I’ve already reached out. Case #33XXX386.
Got coupons for smoothies. Ok what can they do to that? Well…a lot of chemicals taste like banana but nothing but a banana is a banana.
I just like “real food” and there is an abundance around…it’s L.A. just not at McDonald’s.
On my top 10 worst restaurant list!