Important Fraud Alert: We have received reports from customers of phone, electronic, and mailed communications that falsely represent Sunflower Bank and/or our employees. If you are contacted by someone claiming to be from Sunflower Bank attempting to gain access to account information, password, or other sensitive information, contact us directly through a verified phone number. Remember, we will never ask you to provide your online banking login credentials or account information. Customer Care is available at 888.827.5564 for additional assistance.

Welcome to the
Los Alamos, Trinity Dr First National 1870 Branch

The Los Alamos office at 1910 Trinity Drive borders the Historic Downtown Area and Community Centered Ashley Pond; where business and community discoveries are made! This location was the First Bank established in Los Alamos during the 1940’s as related to the infamous, Manhattan Project; the bank’s current location has continuously operated for over fifty years and is proud to be part of Los Alamos history!

Address:

1910 Trinity Dr

Los Alamos, New Mexico 87544

Directions
Find a MoneyPass® ATM

Phone Number:

(505) 662-4155

Lobby Hours:

Mon - Fri: 09:00 AM - 05:00 PM

Drive Thru Hours:

Mon - Fri: 09:00 AM - 05:00 PM

Download Our Mortgage App

 

Services at Our Los Alamos Sunflower Bank Branch

Our team is dedicated to providing exceptional service, tailored financial solutions, and a welcoming atmosphere to help you achieve your financial goals. Whether you need personal banking, business services, or financial advice, we’re here to serve you with the reliability and convenience you deserve.

ABC Program for Education in Los Alamos, NM

Our branch proudly supports local students and schools through our ABC Program for Education. You can register your debit card to support one of our participating schools with each swipe. In your area, we appreciate our partnership with the Los Alamos Middle School Hawks.

Read About Our ABC Program

Register Your Debit Card

six people holding a large Sunflower Bank check in front of a glass building

Meet Our Mortgage Team

5 Star Rating
Christine was superb to work with. She stepped in when a different loan company couldn’t deliver and was able to secure funding in record time. She kept me updated on the progress and made sure I didn't have any questions.
Oksana T
Los Alamos, NM
Nov 04, 2026
5 Star Rating
They were great from start to finish. I was so glad to work with Christine.
Emily S
Los Alamos, NM
Sep 16, 2026
5 Star Rating
Christine was communicative, helpful, respectful, and wonderful to work with. 10/10 recommend!!
Sarah F
Los Alamos, NM
Sep 04, 2026
5 Star Rating
Christine has been so helpful in refinancing our house and getting set up to buy a new one. She has been very responsive and her communication is top notch. I would highly recommend SunFlower Bank!
Sarah F
Los Alamos, NM
Aug 16, 2026
5 Star Rating
We loved working with Lisa. She created a seamless and personalized experience for us to get a great home loan.
Dylan W
Los Alamos, NM
Jul 18, 2026
5 Star Rating
Great person and very helpful. Kept us informed throughout the whole process
Robert L
Los Alamos, NM
Jun 21, 2026
5 Star Rating
Christine was the best. She is VERY experienced and was always there when we needed her. I would now bank with her no matter who she works for.
Jonathan W
Los Alamos, NM
Jun 18, 2026
5 Star Rating
Excellent experience, good communication, exceptional customer service. Christine was easy to work with and always happy to answer questions and provide information.
David K
Los Alamos, NM
Jun 01, 2026
5 Star Rating
Everybody at Sunflower Bank has been incredible and understanding. Moving is extremely stressful, but the loan portion of our move was a breeze thanks to Christine.
Bryan H
Los Alamos, NM
Apr 25, 2026
5 Star Rating
Jolene is the reason I return to guardian
William M
Los Alamos, NM
Apr 07, 2026

Explore Local Stories From Sunflower Bank

Hands displaying memorial t-shirt

Santa Fe Community Honors the Memory of Guardian Mortgage Employee with “Move for the Museum” Fundraising Event

To the First National 1870 community, the late Michaelann Perea was not only an outstanding Guardian Mortgage Area Manager in New Mexico, she was a beloved and accomplished colleague and a generous friend. When she tragically passed away on September 7, 2022, her death not only affected her bank family but the entire community of Santa Fe, New Mexico.

Chef Olea in Branch with medal and hat

Award-Winning Chef’s Success Brings National Attention to his Community

Chef Fernando Olea’s life has been built on love... a love for people, food and community. Chef Olea serves as the executive chef and co-owner of Sazón Restaurant in Santa Fe, New Mexico.