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31st Union

$$ - $$$
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5 S Ellsworth Ave, San Mateo, CA 94401-3910
+1 650-458-0049
17:00 - 22:00
11:30 - 14:00
Open now
See all hours
Sun 17:00 - 21:30
Tue - Thu 17:00 - 22:00
Wed - Fri 11:30 - 14:00
Fri - Sat 17:00 - 00:00
More Info
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31 Reviews from our TripAdvisor Community

Traveller rating
Traveller type
Time of year
Showing 31: English reviews
Level Contributor
9 reviews
9 restaurant reviews
1 of 5 bubbles Reviewed 13 November 2016 via mobile

First of all I was unable to eat at this restaurant due to a reservation error on their part. Because of this I will not attempt to eat here. I really wanted to try this place and made a reservation 3 days in advance for a party of 12. An hour before our reservation I called to see if a... More 

Thank Denielle A
Denver, Colorado
Level Contributor
38 reviews
21 restaurant reviews
common_n_restaurant_reviews_1bd8 4 helpful votes
2 of 5 bubbles Reviewed 31 October 2016 via mobile

The atmosphere is nice, we were seated quickly,and our wait staff was friendly. That is the limit of the positive comments. Two of us ordered hamburgers which had to be sent back because they were severely under cooked (let's say super rare). When the burgers came back they had different buns but were still undercooked. Two of us had fish... More 

Thank kcs r
31stUnion, Owner at 31st Union, responded to this review

Thank you for lending your feedback, kcs. We are sorry to hear you were not satisfied. We take pride in changing the oil in our fryer with absolute regularity every 2 days. It's hard to say exactly what you experienced, but it certainly was not old oil. We are a small, family run business who take pride in offering an... More 

San Francisco, California
2 reviews
5 of 5 bubbles Reviewed 8 October 2016

Great place for good, farm to fork food. We had try - tip sandwich and braised chicken tacos with home made lemonade. Yummy!

Thank Copperbed83
Belmont, California
Level Contributor
3 reviews
3 restaurant reviews
4 of 5 bubbles Reviewed 11 September 2016 via mobile

Good food, attentive service although portions are a little small for the price. Will return to eat here again.

Thank Dooglas99
Bay Area, California
Level Contributor
29 reviews
3 restaurant reviews
common_n_restaurant_reviews_1bd8 48 helpful votes
3 of 5 bubbles Reviewed 6 September 2016

We have wanted to try 31st Union since they opened as we regularly walk past the corner restaurant. We recently visited and unfortunately was disappointed. Yet, there were some positives so I still rate the restaurant 3 stars overall. The Vibe: 4 stars We went there early in the evening on a Saturday night and the place was only 1/2... More 

Thank TravelBugged33
San Francisco area, CA
Level Contributor
190 reviews
93 restaurant reviews
common_n_restaurant_reviews_1bd8 56 helpful votes
5 of 5 bubbles Reviewed 31 July 2016 via mobile

This could be our new favorite restaurant! My husband is very particular. He said this is probably the best restaurant he can remember ever eating in. I agree. Nice cocktails. Very attentive and polite servers. Food was spot on. Nothing to criticize here. We ordered several small plates, which were brought out one at a time, and no long waiting... More 

Thank sjansenavon
31stUnion, Owner at 31st Union, responded to this review

Wow! Thank you so much, sjansenavon! What we do is very much a labor of love; we are so grateful for patrons like you who get so much joy from your experience! Looking forward to seeing you again. Cheers, The Team at 31st Union More 

New York
Level Contributor
89 reviews
58 restaurant reviews
common_n_restaurant_reviews_1bd8 15 helpful votes
5 of 5 bubbles Reviewed 26 July 2016

Went here with a friend who lives local. We had several of the tapas style dishes and they all were very flavorful. Good local beer on tap.

Thank scorro1
31stUnion, Owner at 31st Union, responded to this review

Thank you for the great review, scorro1! We will look forward to seeing you again! Cheers, The Team @ 31st Union More 

South San Francisco, California
Level Contributor
141 reviews
62 restaurant reviews
common_n_restaurant_reviews_1bd8 52 helpful votes
5 of 5 bubbles Reviewed 15 June 2016

Small place with close tables, so not a date place, but a place to hang out with good food. We did the small plates to share and it worked well with our group of four. We enjoyed everything we ordered including the starting meat and cheese plates and wine. They don't have a huge menu, but plenty of variety that... More 

Thank nursedave8
31stUnion, Owner at 31st Union, responded to this review

Please forgive the delayed response to your review. We are so very grateful to patrons like you. We strive to make each meal memorable and enjoyable and agree that it gets warm in our space on warm days. This is the downside of being in an historic building with very tall ceilings on a west-facing corner. Please be assured we... More 

Port Charlotte, Florida
Level Contributor
50 reviews
30 restaurant reviews
common_n_restaurant_reviews_1bd8 22 helpful votes
5 of 5 bubbles Reviewed 27 May 2016

This restaurant is a local favorite of my daughter and her husband. After going there with them, we know why it is a favorite. We were greeted like old friends, seated quickly, and served our drinks with just the right timing. The special for the night was braised beef. Three of us ordered it and it was just amazing -... More 

Thank Kathleen M
Aptos, California
Level Contributor
27 reviews
13 restaurant reviews
common_n_restaurant_reviews_1bd8 3 helpful votes
5 of 5 bubbles Reviewed 18 March 2016

I work in the building behind the sign so I've been to 31st Union many times. Very interesting if limited menu. Portions are small...& that's great at lunch. Informal and amiable. Fish & chips are great!

Thank Steve1066

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Restaurant Details

Rating summary
  • Food
    4.5 of 5 bubbles
    4.5 of 5 bubbles
  • Value
    4 of 5 bubbles
    4 of 5 bubbles
Average prices
US$8 - US$22
Lunch, Dinner
Restaurant features
Takeout, Outdoor Seating, Seating, Waitstaff, Serves Alcohol, Full Bar, Accepts American Express, Accepts Mastercard, Accepts Visa, Reservations, Wheelchair Accessible
Good for
Bar Scene
Open Hours
17:00 - 21:30
17:00 - 22:00
17:00 - 22:00
11:30 - 14:00
17:00 - 22:00
11:30 - 14:00
11:30 - 14:00
17:00 - 00:00
17:00 - 00:00
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
31st Union is the Peninsula's hottest eatery. 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.

Questions & Answers

Questions? Get answers from 31st Union staff and past visitors.
Posting guidelines
Typical questions asked:
  • Do you have gluten-free options?
  • Is there a dress code?
  • Do you allow dogs on the outdoor patio?