Sentinel

NCUA-insuredfederal charterlow-income designated

Headquartered in Box Elder, South Dakota. Chartered in 1955. Charter number 10257.

Total assets

$197M

Members

9,857

Shares & deposits

$174M

Net worth ratio

10.78%

net worth / assets

Locations (8)

Mainmain officeCorporate Office

2723 LeMay Blvd, Ellsworth Afb, SD 57706 map

☎ 6059231405Member services

9 A.M - 5 P.M Mountain Time

Triple CrownBranch Office

4011 Triple Crown Dr, Rapid City, SD 57701 map

☎ 6059231405ATMDrive-throughMember services

9 A.M - 5 P.M Mountain Time

HainesBranch Office

1430 Haines Ave Ste 101, Rapid City, SD 57701 map

☎ 6059231405ATMDrive-throughMember services

9 A.M - 5 P.M Mountain Time

WinnerBranch Office

511 E 2nd St, Winner, SD 57580 map

☎ 6058423581Drive-throughMember services

8 A.M - 4 P.M. Central Time

Radar Hill BranchBranch Office

22752 Mule Deer Trl, Box Elder, SD 57719 map

☎ 6059231405ATM

Custer OfficeBranch Office

18 Mount Rushmore Rd, Custer, SD 57730 map

☎ 6056734416ATMDrive-throughMember services

Monday thru Thursday 9:00a.m.-5:00p.m.Friday 8:00a.m. to 5:30p.m.Saturday 9:00a.m. to 12:00p.m.

Hill City OfficeBranch Office

553 E Main St, Hill City, SD 57745 map

☎ 6055749596Member services

Monday thru Friday 8:00a.m. to 5:00p.m.Saturday 9:00a.m. to 12:00p.m.

Liberty BranchBranch Office

441 N Ellsworth Rd, Box Elder, SD 57719 map

☎ 6059231405ATMDrive-throughMember services

Lobby: M-F 9:00 AM-5:00 PM Drive Up: M-Thursday 8:00 AM-5:00 PM Drive Up: Friday 8:00 AM-5:30 PM Drive Up: Saturday 9:00 AM-12:00 PM

Transcribed from NCUA call-report data (cycle 2026-03). Phone numbers and hours are as reported to the NCUA and can lag reality — verify before visiting. Share deposits are NCUA-insured up to $250,000 per member.