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Lobbies temporarily closed in Rapid City and Box Elder beginning on Aug. 10.  READ MORE

Finding the Nearest Branch and ATM is Easy

Whether you are across town or traveling far from home, you are welcome at any of our seven convenient branches in South Dakota and at any of the 5,600 CO-OP Shared Branch locations and the 250 Xtend Shared Branch locations nationwide.

Finding the Nearest Branch and ATM is Easy

Whether you are across town or traveling far from home, you are welcome at any of our seven convenient branches in South Dakota and at any of the 5,600 CO-OP Shared Branch locations and the 250 Xtend Shared Branch locations nationwide.

You can get person-to-person assistance with your accounts and conduct transactions just like you would at your home Credit Union. Just look for the CO-OP Shared Branch and the Xtend Shared Branch logos.

Get cash surcharge-free at more ATMs than ever.* You’ll find nearly 30,000 surcharge-free ATMs with the CO-OP ATM logo. Including locations at places you may shop, such as 7-Eleven® and Costco®.

Sentinel Federal Locations, Hours & ATMs

Call Center

Call Center Hours

Mon – Fri 7:30 am – 5:30 pm MT

Contact Us

Main Phone: 605-923-1405
Toll-Free: 888-923-1400
Fax: 605-923-3960

DSN: 675-6303

Send Us A Message

Mailing Address

PO Box 700
Box Elder SD 57719

Our Call Center is live and local

We are proud to have live Call Center Representatives available Monday through Friday from 7:30 a.m. to 5:30 p.m. (MT) to answer your calls.

There is no menu to listen to or selections to make. Our Call Center Team will answer the phone and assist you. We believe that your membership with us deserves a personal touch.

Give us a call at 605-923-1405 or 888-923-1400. Our military members can also call us on the Defense Switched Network (DSN) at 675-6303.

Box Elder – Radar Hill Road Branch

Street Address

22752 Mule Deer Trail
Box Elder SD 57719

Mailing Address

PO Box 700
Box Elder SD 57719

Drive-Up ATMs

447 North Ellsworth Road
Box Elder, SD 57719

22752 Mule Deer Trail
Box Elder, SD 57719

Contact Us

Main Phone: 605-923-1405
Toll-Free: 888-923-1400
Fax: 605-791-5511

Send Us A Message

Call Center Hours

Mon – Fri 7:30 am – 5:30 pm MT

Lobby Hours

Closed

Drive-Up Hours

Mon – Thurs 8:00 am – 5:00 pm
Friday 8:00 am – 5:30 pm

Custer Branch

Street Address

18 Mount Rushmore Road
Custer, SD 57730

Mailing Address

PO Box 700
Box Elder SD 57719

Drive-Up ATM Contact Us

Main Phone: 605-923-1405
Toll-Free: 888-923-1400
Fax: 605-673-5385

Send Us A Message

Call Center Hours

Mon – Fri 7:30 am – 5:30 pm MT

Lobby Hours

Mon – Fri 9:00 am – 5:00 pm

Drive-Up Hours

Mon – Thurs 8:00 am – 5:00 pm
Friday 8:00 am – 5:30 pm

Saturday 9:00 am – Noon

Ellsworth AFB – Main Office

Street Address

2723 Lemay Blvd
Ellsworth AFB, SD 57706

Mailing Address

PO Box 700
Box Elder SD 57719

Drive-Up ATM

2723 Lemay Blvd
Ellsworth AFB, SD 57706

Walk-Up ATM

2932 Arnold Dr
Ellsworth AFB, SD 57706

Contact Us

Main Phone: 605-923-1405
Toll-Free: 888-923-1400
Fax: 605-923-3960

DSN: 675-6303

Send Us A Message

Call Center Hours

Mon – Fri 7:30 am – 5:30 pm MT

Lobby Hours

Mon – Fri 9:00 am – 5:00 pm

Hill City Branch

Street Address

553 E. Main Street
Hill City, SD 57745

Mailing Address

PO Box 240
Hill City, SD 57745

Contact Us

Main Phone: 605-923-1405
Toll-Free: 888-923-1400
Fax: 605-574-9598

Send Us A Message

Call Center Hours

Mon – Fri 7:30 am – 5:30 pm MT

Lobby Hours

Mon – Fri 8:00 am – 5:00 pm
Saturday 9:00 am – Noon

Rapid City – Haines Branch

Street Address

1430 Haines Ave Ste 101
Rapid City, SD 57701

Mailing Address

PO Box 700
Box Elder SD 57719

Drive-Up ATM

Contact Us

Main Phone: 605-923-1405
Toll-Free: 888-923-1400
Fax: 605-348-8047

Send Us A Message

Call Center Hours

Mon – Fri 7:30 am – 5:30 pm MT

Lobby Hours

Closed

Drive-Up Hours

Mon – Fri 7:30 am – 5:30 pm

Saturday 9:00 am – Noon

 

Rapid City – Triple Crown Branch

Street Address

4011 Triple Crown Dr
Rapid City, SD 57701

Mailing Address

PO Box 700
Box Elder SD 57719

Drive-Up ATM

Contact Us

Main Phone: 605-923-1405
Toll-Free: 888-923-1400
Fax: 605-342-2055

Send Us A Message

Call Center Hours

Mon – Fri 7:30 am – 5:30 pm MT

Lobby Hours

Closed

Drive-Up Hours

Mon – Thurs 8:00 am – 5:00 pm
Friday 8:00 am – 5:30 pm
Saturday 9:00 am – Noon

Winner Branch

Street Address

511 E 2nd St
Winner, SD 57580

Mailing Address

511 E 2nd St
Winner, SD 57580

Drive-Up ATM

 

Contact Us

Phone: 605-842-3581
Toll-Free: 888-923-1400
Fax: 605-842-1370

Send Us A Message

Call Center Hours

Mon – Fri 7:30 am – 5:30 pm MT

Lobby Hours

Mon – Fri 8:30 am – 3:30 pm CT

Drive-Up Hours

Mon – Fri 8:00 am – 3:30 pm CT

CO-OP ATM & Shared Branch Locator

From coast to coast, you’re welcome at branches and ATMs wherever you see the CO-OP logos. That covers a lot of territory — whether you’re across town or traveling far from home for business or pleasure. Your credit union membership means you can:

  • Use nearly 30,000 surcharge-free* ATM locations — more than some of the biggest banks offer
  • Take advantage of surcharge-free ATMs at convenient places like 7-Eleven® and Costco®
  • Visit over 5,600 convenient Shared Branch locations covering all 50 states – simply have your credit union name, account number, and a government ID and you’ll have access to your accounts
  • Easily locate ATMs and branches through any of our locator tools — including phone, mobile app or Internet

Find a CO-OP Shared Branch or surcharge-free ATM right now at www.allco-op.org or call 1-888-SITE-CO-OP.*

*There are no surcharge fees at ATMs that we own and at ATMs that display the CO‑OP logo. Per our Common Features (Fee Schedule) there is a $1.25 fee per ATM withdrawal/transfer at ATMs we do not own and a $.50 fee per Account Balance Inquiry.

 

Xtend Shared Branch Locator

 

At over 250 Xtend Shared Branches nationwide, you can get convenient access to your Credit Union accounts and make transactions.

  • Withdrawals
  • Deposits
  • Loan payments
  • Transfers
  • Balance inquiries

For a complete list of locations and hours, visit search.xtendcu.com.

Download the Xtend Shared Branch App from the App Store and on Google Play.