SENTINEL
Federal • BOX ELDER, South Dakota • Est. 1955
Quick Facts
- Charter Number
- #10257
- Type
- Federal
- Established
- 1955
- Headquarters
- BOX ELDER, South Dakota 57719
- Address
- PO BOX 700
- Branches
- 8
- ATMs
- 5
- Members
- 9,834
- Membership Type
- Other/Unknown
NCUA Financial Health Score
Based on NCUA Q4 2025 Call Report data
Exceptionally well-capitalized with outstanding net worth ratio, very low delinquency, and strong earnings. One of the most financially sound credit unions in the country.
Financial Overview
Total Assets
Members
9,834 total members
Total Loans
Outstanding loan portfolio
Net Worth Ratio
Financial Details
| Metric | SENTINEL |
|---|---|
| Total Assets | $197.2M |
| Members | 9,834 |
| Loans Outstanding | $121.2M |
| Shares & Deposits | $174.5M |
| Net Worth | $21.0M |
| Net Worth Ratio | 10.63% |
| Loan-to-Share Ratio | 69.5% |
| Delinquency Rate | 0.45% |
| Net Income | +$2,332,602 |
Source: NCUA Q4 2025 Call Report • Cycle date: 12/31/2025
Branch Locations
8 locations · 5 ATMs
Main
Main Office2723 LeMay Blvd
Ellsworth AFB, SD 57706
Triple Crown
4011 Triple Crown Dr
Rapid City, SD 57701-2098
Haines
1430 Haines Ave Ste 101
Rapid City, SD 57701-0612
Winner
511 E 2nd St
Winner, SD 57580-2052
Radar Hill Branch
22752 Mule Deer Trl
Box Elder, SD 57719-9456
Who Can Join SENTINEL?
Membership Type: Other/Unknown
Membership eligibility for SENTINEL may vary. Contact the credit union directly to confirm qualification requirements.
Contact SENTINEL directly or visit their website for the most accurate and up-to-date membership eligibility information.
Find More Credit Unions in South Dakota
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View South Dakota RankingsFrequently Asked Questions
Yes. SENTINEL is federally insured by the National Credit Union Administration (NCUA) up to $250,000 per depositor, per ownership category. This provides the same level of deposit protection as FDIC insurance at a bank.
As of the NCUA Q4 2025 Call Report, SENTINEL has 9,834 members and a potential membership field of 197,733 people.
SENTINEL's net worth ratio is 10.63% as of Q4 2025. The NCUA classifies a credit union as "well-capitalized" when its net worth ratio is 7% or higher. At 10.6%, SENTINEL meets this threshold.
SENTINEL operates 8 branch locations and has access to 5 ATMs. The main office is located at 2723 LeMay Blvd, Ellsworth AFB, SD 57706.
SENTINEL was established in 1955. It is a federal credit union chartered under charter number 10257. The institution has been serving members for 71 years.
Data sourced from the NCUA Quarterly Call Report (Q4 2025). CUScore is an independent directory and is not affiliated with the NCUA or SENTINEL. All financial data is for informational purposes only.