Sentinel Federal Credit Union has been guarding and protecting the financial well being of our members for 55 years. Our mission is to maintain integrity and protect the financial future of our member owners.

Additional Information

• Other Services
• Fraud Alerts
• News & Notices
• Disclosures
• Holiday Schedule
• Financials
• Shared Branching

Routing Number: 291479291

Sentinel Federal Credit Union offers our Business members:

• Checking
• Savings
• Debit & Credit Cards
• Loans & Lines of Credit
• Merchant Processing Services

Through a strategic alliance with Newtek Business Services, Inc., our Business members can take advantage of the following services:

• Small Business Finance (SBA Lending from $25,000 to $2,000,000)
• Data Storage
• Web Hosting
• Web Design & Development

Your business is eligible for membership if either:

• At least one equity owner of the business is a member or
• The business entity is located within our field of membership: Pennington, Lawrence, Meade, Custer, Lyman, Todd, Tripp, Gregory, or Mellette Counties.

Contact our Business Financial Service Representative for more information.

Phone: 888-923-1400
Email: dobusiness@sentinelfcu.org

Call Center Services available M-F from 9 a.m. – 5 p.m. (MT) at no charge!

• Forgot your online banking password?
• Need to reactivate your online banking account?
• Need to order checks?
• Send us a message

Phone Numbers:

Main Phone: 605-923-1405
Toll-Free: 888-923-1400
Main Fax: 605-923-3960
Overseas DSN: 675-6303

To Report Lost or Stolen Cards:

If your Sentinel Federal card is lost or you believe it has been stolen, call us immediately at the appropriate number below.

During Normal Business Hours: Mon – Fri 8:00 am – 5:00 pm (MT)
Phone: 605-923-1405 / 888-923-1400

After Business Hours:
ATM Cards: 800-472-3272
Debit Cards: 800-682-6075
Credit Cards: 800-543-5073

Mailing Address:

Sentinel Federal Credit Union
PO Box 700
Box Elder, SD 57719

Routing Number: 291479291

Locations & Hours  I  Shared Branching  I  24/7 Services

Telephone Banking
Take care of transactions over the phone with CU*Talk

Online Bill Pay
Save time and money by paying your bills electronically with Easy Pay Online Bill Pay

Mobile Web Banking
Take care of your finances on the go with Mobile Web Banking

Online Check Ordering
Our online ordering tool makes shopping quick and easy when you need to order checks

Online Applications
You can easily complete a Membership Application and a Loan Application right online

ATM Locations
Access your account 24/7 at these ATM locations

You may access your account, fee-free, by using your Sentinel Federal ATM card or Debit Card at the following Sentinel Federal-owned ATMs:

Rapid City, SD
Drive-Up ATM: Haines Branch – 1430 N Haines Ave
Drive-Up ATM: Triple Crown Branch – 4011 Triple Crown Dr

Ellsworth AFB, SD
Drive-Up ATM: Located in BX Parking Lot
Walk-Up ATM: Located in Shoppette

Box Elder, SD – New Location
Drive-Up ATM: 447 North Ellsworth Road (next to Villa Car Wash)

Mailing Address:

Sentinel Federal Credit Union
PO Box 700
Box Elder SD 57719

Branch Locations & Hours:

Main Office
On Ellsworth AFB connected to BX
Mail: PO Box 700 – Box Elder SD 57719
Phone: 605-923-1405 / 888-923-1400
Fax: 605-923-3960
Overseas DSN: 675-6303
Call Center Hours: Mon – Fri 8:00 am – 5:00 pm (MT)
Lobby Hours: Mon – Fri 9:00 am – 5:00 pm (MT) 
Contact Us

Haines Branch
1430 N Haines Ave, Suite 101 – Rapid City, SD 57701
Phone: 605-923-1405 / 888-923-1400
Fax: 605-348-8047
Call Center Hours: Mon – Fri 8:00 am – 5:00 pm (MT)
Lobby Hours: Mon – Fri 9:00 am – 5:00 pm (MT)
Drive-Up: Mon – Fri 7:30 am – 5:30 pm (MT) / Saturday 9:00 am – Noon (MT)  

Triple Crown Branch
4011 Triple Crown Dr – Rapid City, SD 57701
Phone: 605-923-1405 / 888-923-1400
Fax: 605-342-2055
Call Center Hours: Mon – Fri 8:00 am – 5:00 pm (MT)
Lobby Hours: Mon – Fri 9:00 am – 5:00 pm (MT)
Drive-Up: Mon – Fri 9:00 am – 5:00 pm (MT) / Saturday 9:00 am – Noon (MT)   

Winner Branch
757 W 2nd St – Winner, SD 57580  
Mail: PO Box 87 – Winner, SD 57580
Phone: 605-842-3581 / 888-923-1400
Fax: 605-842-1370  
Lobby Hours: Mon – Fri 8:30 am – 3:30 pm (CT)
Drive-Up: Mon – Fri 8:00 am – 3:30 pm (CT)

To Report Lost or Stolen Cards

If your Sentinel Federal card is lost or you believe it has been stolen, call us immediately at the appropriate number below.

During Normal Business Hours: Mon – Fri 8:00 am – 5:00 pm (MT)
Phone: 605-923-1405 / 888-923-1400

After Business Hours:
ATM Cards: 800-472-3272
Debit Cards: 800-682-6075
Credit Cards: 800-543-5073

Shared Branching

Shared Branching gives you convenient access to your credit union accounts at over 185 credit union locations. Get details

As part of our Business Services, Sentinel Federal Credit Union can help you quickly set up a wide range of credit and debit card options for your customers. Contact our Business Financial Service Representatives for more information.

Safe Deposit Boxes

Safe deposit boxes are safe and secure places to keep valuable personal items but they are not fire nor flood proof. Vaults are fire, flood, and heat “resistant”. Your box contents are not insured by the Credit Union. Ask your insurance agent about available options to insure the contents of your safe deposit box. Annual rental fees are automatically withdrawn from your savings or checking account on January 1st each year. Please contact us for availability.

Direct Deposit

Direct Deposit is the easy way to deposit your paycheck. Instead of receiving a written check that you must personally bring to the Credit Union, your pay is electronically transferred from your employer right to your Credit Union account. Social Security and other government checks can also be direct deposited. There’s no standing in line and no reason to make a special trip to the Credit Union. It’s free, easy, safer and a time saver. Find out if your employer offers direct deposit. If so, ask for an enrollment form, usually available through your human resource department. Complete it and return it to your employer. Or, ask a Credit Union Member Service Representative for an enrollment form, fill it out and return it to your payroll department. Direct Deposit usually begins within 30 days.

Payroll Deduction

Save money the easy way – through payroll deduction. Most employers have a payroll deduction program, which allows employees to have a portion of their pay sent directly to the Credit Union. You can even arrange to have your loan payments or Christmas Saver account deposits made through payroll deduction. If you already have direct deposit at the Credit Union we can automatically transfer money to your savings account each payday. Just let us know how much you’d like transferred and to what account. Check with your employer about signing up for payroll deduction or inquire at the Credit Union.

Night Deposit

The easy way to conduct business after hours. Okay, it’s after Credit Union business hours, you forgot to make your deposit and you’ve got to be at work before we open in the morning — not a problem. Use the night deposit that’s available at the branches. 

It’s important to remember that deposits made after hours are posted the next business day. Friday after hour deposits will be posted on Monday. Please be aware however that checks trying to clear your account and automatic loan payments may occur before your night deposit is posted. This may result in an overdraft. If it is vital for you to have your deposit posted first thing in the morning, we recommend you bring it in personally. Don’t let the name “Night Deposit” mislead you, you can drop off a deposit there even during business hours, just remember it will be posted the next business day.

Savings Bonds

Buy electronic savings bonds online
The U.S. Department of the Treasury discontinued over-the-counter sales of paper savings bonds on December 31, 2011. Savings Bonds are no longer sold at Sentinel Federal Credit Union. Savings bonds are available for purchase as electronic issues in TreasuryDirect®. TreasuryDirect is a secure Web-based system that allows investors to establish accounts to purchase, hold and manage Treasury securities online at www.treasurydirect.gov. Learn more