Small place but the food was to DIE for! Wasabi mayo was a great addition to a double burger and the kids loved the hot dogs and fries. The dumpster fries were so good, too. Staff was friendly and checked in even though they don't actually "wait" on the tables. Will definitely be returning! read more

Stopped for lunch again as the burgers are always good and this time the fry's were much better than the previous time.

Burgers, fries, hotdogs and shakes, this place sticks to their best and they do it well! I think I've just had one of my all time favorite burgers here and I look forward to trying them all eventually, not to mention a shake next time! Very small inside so be ready to either eat in your car or take it to go. I ordered the whiskey steakhouse burger and man was it good. Staff was super friendly and quick to help me navigate their menu as a first timer. I will definitely be back here without question. read more

Keystone Corner Lunch - Whiskey steakhouse burger - Burgers Near Me - Saint Marys, Pennsylvania

Couldn't recommend this enough! The people are lovely, the food is amazing, the prices are great! We would drive three hours just for this food. The poutine is better than what we had in Canada! read more

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Burgers, dogs, and for some reason poutine. They have a lot of great looking options, but if you don't like any of them they'll customize anything for you. Also they have gluten-free options which was a real plus for us. Staff was super helpful about explaining the options and making recommendations. We ordered the French onion burger and the poutine and both were great. Will definitely go back if we're that way again. This is a small place and a converted service station. Rest room is around back but it is CLEAN! read more

Keystone Corner Lunch - Burgers Near Me - Saint Marys, Pennsylvania

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I always count myself lucky when I stop in a town new to me and find a specialty hot dog shoppe. And being able to get a chili cheese and french onion dog in St. Mary's was no exception. The crisp natural casing dog was perfectly prepared and their toppings were absolutely fantastic. Also has a side order of fresh cut fries and regretted not having enough room left to try a burger or a milkshake as everything sounded delicious. Friendly duo working behind the counter as well. read more

Keystone Corner Lunch - Chili cheese and french onion dogs - Burgers Near Me - Saint Marys, Pennsylvania

This place may be small, but the food is probably the best I've had in a long time. The staff are very helpful, and the ability to mix and match in regard to the menu is awesome. We are trying to eat Keto, and we were able to get our burgers wrapped in lettuce. Not all places are willing to do that. I can't recommend this place enough. read more

order was wrong and only got worse when the cook fixed it. the burger patties got dried out most of the toppings were gone. So I ended up with a pricey burger to choke on. read more

What a gem to find! We simply googled Burgers and the 4+ star reviews brought us in. Think 5 Guys but OH SO MUCH BETTER & CHEAPER!!! So many choices to make the burger or dog of your choice or choose a creation of theirs. Only issue is that there are very few seats. But I would guarantee take-out would be amazing as well! We had a double burger and fries topped with bbq pork, cheese, sauce, bacon, and more! read more

Awesome job KCL. I'm in St Mays for work today and stopped in to pick up lunch. I got the chili cheese burger and these AWESOME fries. The fries are like a meal in themselves. Fast, friendly service. I'll definitely be back! read more

Keystone Corner Lunch - Awesome pork BBQ fries. WOW! - Burgers Near Me - Saint Marys, Pennsylvania

Good burgers, food is always top notch! Don't forget to get a milkshake while you're there.

We heard about this new burger place and decided to give it a try. We were more than pleased with the food choices and enjoyed our meals. Even the baby sat up and ate. She also danced in her highchair to the music and painted her fingernails with ketchup, but family meals must include fun. The prices were fair and we'll go back again. read more

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Great food great milkshakes California burger is awesome. Try it. It I am worth it. Chili fries are great

In the quiet, unassuming town of St. Mary's sits this unbelievable hidden gem! My favorite coffee shop closed and I was beyond disappointed because there just isn't much in St. Mary's. I saw Keystone the last time I was in town (and discovered the closed coffee shop) and was very intrigued. Back in town so I had to stop. This place is amazing! I decided to stay simple on my first trip and went with the classic double burger. My word I was not prepared for how good it would be. So juicy and packed full of flavor, cooked to perfection. I got a "regular" bun and it too was so fresh and tasty. And the fries...oh man the fries! Again, perfectly cooked and just the right amount of salt. The menu is very extensive so it was a little difficult to decide on what to get. However, after this pleasant experience, I can't wait to keep coming back and trying everything on the menu. There are some very creative burger combinations and intriguing hot dogs. Not to mention several different ways to order the already perfect fries. If I could (and man I wish I could), I would pack up this hole place and move it to my town of Medina, OH. Keystone would be a huge hit wherever they landed. St. Mary's is a little more attractive because Keystone is here. read more

Delicious burgers and poutine fries were delicious and a hearty meal! Friendly staff! read more

We had someone in our party with a gluten and dairy sensitivity. They went above and beyond to accommodate without making anyone feel like we were burdensome. Also, had the French Onion and Soo Cali burgers. Very tasty. read more

Food is really good tasting. Their menu is very open. Service is always very good with a smile. They got some old games such as a Pac-Man machine game to look at. read more

This is a one of my absolute must stops when I am back home in St. Marys! Every burger I have ever tried has been amazing, crispy delicious fries, and creamy milkshakes! My favorite item though has to be the chicken sandwiches on Sundays, they are a must! read more

The burgers here are amazing, I absolutely love this place!! I wish they did Door Dash! That would be great!

This was really good. Burgers dogs milkshakes, we ordered curbside and it was on time and order was spot on, will certainly stop again next time we are in town! read more

Food and service are absolutely wonderful! I got the BBQ bacon burger, forget what name they had for it but I can't wait to have another one! read more

OMG. Awesome custom burger, awesome Chicago dog, and POUTINE FRIES!!! Highly recommend! Tiny unassuming place, you will not regret it!

Best burgers in Saint Marys, hands down! The staff is always nice and courteous and they offer delivery of you need it. Their fries with gravy are to die for! read more

Horrible potatoes !!!! Me and my husband just ordered burgers and load potatoes (02/10/2021) : burgers were hot and taste alright, but potatoes were cold and dried as it was sitting there from yesterday!!! If you know the taste of yesterday potatoes that what we got there!! Very upset as I used to love that place, never get treated as bad, and also for order which cost us around 30 $. read more

Stopped here after doing errands and had a fantastic lunch. The staff was super friendly and the food was great. We got the chicken sandwich which was only served on Sunday and loaded fries. Great food, I'd come here again! read more

Keystone Corner Lunch - Burgers Near Me - Saint Marys, Pennsylvania

A restaurant can win me over by selling good wings and good burgers.... everyone knows that! Although you can't find the crunchy mouth watering wings of chicken here, that is not what this place is about. Keystone Corner Lunch is all about that ground chuck, and serving it in fashion especially for the thick glasses or long person individual. Just because I don't understand the culture of hipsters does not mean I don't like them because, from my experience traveling all across America, they are hard working and extremely nice and polite people. More importantly, they cook up great food and this place proves that with their twists on the most American dish ... burgers, dogs, and fries. Love going here for a quick bite.... especially when the beautiful Sara? takes my order! read more

Awesome selection. Outside of the box menu. Superb execution. What a cool place, great atmosphere. It's small so I bet it gets crowded at times. We were just driving through on a rainy Sunday afternoon. What a bright spot to a dreary day! read more

Great trendy place with that hipster vibe. Great selection of craft burgers and dogs. Vegan options too!

Best Burgers & Fries! The "Secret Burger" is my favorite! Do yourself a favor and try it; you won't be disappointed.

Awesome little hot spot. They made the best burgers and fries. Pick yourself up a milkshake and say Hi to the Chefs Jamie and Seth. Both really friendly guys. read more

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fair prices* fresh* hot* fast* & delicious! a shining gem in the middle of bland mediocrity. these folks know from diner food. then entire spectrum of the menu pleases everybody in a 10 people party you know you have hit the jackpot. when in elk county it's our go-to eatery. from their home- made relishes to traditional comfort food dishes it all comes together in downtown st marys. the fresh cut fries are fantastic, the best poutin anywhere around. read more