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31st Union

5 S Ellsworth Ave, San Mateo, CA 94401-3910
+1 650-458-0049
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  • Excellent49%
  • Very good30%
  • Average17%
  • Poor2%
  • Terrible2%
Travellers talk about
“sandwich” (4 reviews)
“fries” (7 reviews)
“halibut” (2 reviews)
Closed Now
American, Spanish
$$ - $$$
5 S Ellsworth Ave, San Mateo, CA 94401-3910
All Details
Write a ReviewReviews (46)
Traveller rating
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1 - 10 of 46 reviews

Reviewed 4 weeks ago via mobile

Why only an average review? The food was mostly good. My Union Brunch had properly cooked poached eggs and terrific crispy skinned potatoes. My wife's burger was 'okay, but just a burger'. Tasted liked it was pre-cooked and reheated. The final blow for me was...More

Thank Compuvideo
Reviewed 4 July 2018

We’ve been coming here since it opened. Fresh, locally source ingredients, tasty and inventive dishes, decent wine, with several great options on tap. It is our favorite place to go in the ‘hood. Can’t miss.

Thank Emilie T
Reviewed 30 June 2018 via mobile

It’s summer and that means the fresh halibut is back and I am sooooo happy! We always start with a delicious assortment of meat and cheese with spicy mustard (mmmmm). Their fries are the best I have ever had, followed by their burger and fried...More

Thank Jade G
Reviewed 18 May 2018

Such a nice restaurant for in San Mateo! Food was outstanding and service was excellent! Prices are very good too. We loved this restaurant and will be back for sure!!!!!

Thank Chataranga
Reviewed 18 April 2018 via mobile

One of about 100 of the seemingly endless restaurants in the San Mateo-Burlingame area we’ve been wanting to go to since we moved here. The wait was rewarded. Great spot, very good vibe, packed, super wait guy, very good halibut and fish tacos with excellent...More

Thank MikeandSarah
Reviewed 6 February 2018

I assume the owners have high aspirations but they have to try harder. I like the vibe, interior design and nice staff but the food is just good, not great, and you have to pay as if it was great. The black cod dish was...More

Thank Acidov
Reviewed 8 January 2018

We came for brunch and had some great food. The service was very problematic which was strange as we were 1 of 3 parties when we were seated. We had to ask for our order to be taken and again for water and again for...More

Thank MTSDave N
Reviewed 23 December 2017 via mobile

This place is a hidden gem! We had our Christmas party in the private room and it was terrific. The food is amazing! David and his crew do an awesome job!

Thank Teri W
A TripAdvisor Member
Reviewed 27 November 2017 via mobile

Last week daughter and we needed a bite while running errands midday. We were awfully glad we popped into 31st Union. Self-proclaimed "locovore" cuisine is provided here. Finding seating at one end of a social table, we decided on food, then placed orders with the...More

Thank A TripAdvisor Member
31stUnion, Owner at 31st Union, responded to this reviewResponded 28 November 2017

Excellent! Thank you so much for taking time to review our lunch. Everything you mention is what we work toward. We use exceptional ingredients and delight in providing exceptional service. Happy holidays to you!

Reviewed 25 October 2017

If you want a great dining experience in San Mateo, you need to check this place out! Exceptional quality ingredients and very friendly staff! The wine and drink selections are creative and locally or CA sourced. Creative menu and I return as often as I...More

Thank anndsalazar
31stUnion, Owner at 31st Union, responded to this reviewResponded 27 October 2017

Thank you @anndsalazar! We so appreciate you taking the time to write this review! We are grateful for your patronage! Also, we do take reservations - but only for up to 5 people online. You can always call us to reserve a table. We look...More

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Restaurant Details

Rating summary
  • Food
  • Value
Average prices
US$7 - US$25
Lunch, Dinner, Brunch
Restaurant features
Takeout, Outdoor Seating, Seating, Waitstaff, Television, Highchairs Available, Serves Alcohol, Full Bar, Accepts American Express, Accepts Mastercard, Accepts Visa, Free Wifi, Reservations, Parking Available, Street Parking, Free Off-Street Parking, Wheelchair Accessible, Wine and Beer, Accepts Credit Cards
Good for
Bar Scene
Open Hours
5:00 PM - 9:00 PM
10:00 AM - 2:00 PM
5:00 PM - 9:30 PM
5:00 PM - 9:30 PM
11:30 AM - 2:00 PM
5:00 PM - 9:30 PM
11:30 AM - 2:00 PM
11:30 AM - 2:00 PM
5:00 PM - 11:00 PM
5:00 PM - 11:00 PM
10:00 AM - 2:00 PM
Location and Contact Information
  • Address: 5 S Ellsworth Ave, San Mateo, CA 94401-3910
  • Location: United States  >  California (CA)  >  San Mateo
  • Phone Number: +1 650-458-0049
  • E-mail
31st Union is the Peninsula's hottest eatery. As seen on KQED's "Check, Please!" & Recommended by the 2014 Bay Area Michelin Guide, raved about by food bloggers and locals alike, 31st Union has developed a cult following. 31st Union offers local, seasonal comfort food, a full bar featuring hand crafted cocktails, wines featuring the best California wine and craft beer. Open for lunch, dinner and happy hour. Available for private parties and catering.
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