| City Savings Bank & Trust Company | Louisiana |
| City State Bank | Iowa |
| City Trust Federal Credit Union | Indiana |
| Citywide Banks | Colorado |
| Civic Bank & Trust | Tennessee |
| Civil Service Employees Association Credit Union | Ohio |
| Civis Bank | Tennessee |
| Civista Bank | Ohio |
| Clackamas Community Federal Credit Union | Oregon |
| Clackamas County Bank | Oregon |
| Clairton Works Federal Credit Union | Pennsylvania |
| Clare Bank | Wisconsin |
| Claremont Savings Bank | New Hampshire |
| Clarence Community & Schools Federal Credit Union | New York |
| Clarence State Bank | Missouri |
| Clarion County Community Bank | Pennsylvania |
| Clarion Federal Credit Union | Pennsylvania |
| Clarity Credit Union | Idaho |
| Clarke County State Bank | Iowa |
| Clarke Educators Federal Credit Union | Alabama |
| Clarksburg Area Postal Employees Federal Credit Union | West Virginia |
| Clarkson Bank | Nebraska |
| Clarkston Brandon Community Credit Union | Michigan |
| Clarkston State Bank | Michigan |
| Class Act Federal Credit Union | Kentucky |
| Classic Bank | Texas |
| Classic Federal Credit Union | Ohio |
| Clatsop Community Bank | Oregon |
| Clay County Bank | West Virginia |
| Clay County Savings Bank | Missouri |
| Clay County State Bank | Illinois |
| Clay Electric Employees Credit Union | Florida |
| Clayton Bank and Trust | Tennessee |
| ClearChoice Federal Credit Union | Pennsylvania |
| Clearfield Bank & Trust Company | Pennsylvania |
| Clearfield Stone Workers Federal Credit Union | Pennsylvania |
| Clear Lake Bank & Trust Co. | Iowa |
| Clear Mountain Bank | West Virginia |
| Clearpath Federal Credit Union | California |
| ClearPoint Federal Bank & Trust | Indiana |
| Clearview Federal Credit Union | Pennsylvania |
| Clements Federal Credit Union | Minnesota |
| Cleo State Bank | Oklahoma |
| Cleveland-Bradley Cty Teacher Federal Credit Union | Tennessee |
| Cleveland Church of Christ Federal Credit Union | Ohio |
| Cleveland Heights Teachers Credit Union | Ohio |
| Cleveland Police Credit Union | Ohio |
| Cleveland Selfreliance Federal Credit Union | Ohio |
| Cleveland State Bank | Wisconsin |
| Clifford-Jacobs Employees Credit Union | Illinois |
| Clifton NJ Postal Employees Federal Credit Union | New Jersey |
| Clifton Savings Bank | New Jersey |
| Clifty Creek Employees Federal Credit Union | Indiana |
| Clinchfield Federal Credit Union | Tennessee |
| Clinton Bank | Kentucky |
| Clinton Federal Credit Union | South Carolina |
| Clinton National Bank | Iowa |
| Clinton Savings Bank | Massachusetts |
| Cloverbelt Credit Union | Wisconsin |
| Clover Community Bank | South Carolina |
| CMC-FCPI Employees Federal Credit Union | Pennsylvania |
| CME Federal Credit Union | Ohio |
| CNB | Maryland |
| CNB Bank | Pennsylvania |
| CNB Bank | West Virginia |
| CNB Bank and Trust | Illinois |
| CN/IC Employee Credit Union | Tennessee |
| CNLBank | Florida |
| C&NW Proviso Credit Union | Illinois |
| Coastal Bank & Trust | North Carolina |
| Coastal Bend Post Office Federal Credit Union | Texas |
| Coastal Carolina National Bank | South Carolina |
| Coastal Commerce Bank | Louisiana |
| Coastal Community and Teachers Credit Union | Texas |
| Coastal Community Bank | Washington |
| Coastal Community Federal Credit Union | Texas |
| Coastal Credit Union | Mississippi |
| Coastal Federal Credit Union | North Carolina |
| Coastal Heritage Bank | Massachusetts |
| CoastalStates Bank | South Carolina |
| Coastal Teachers Federal Credit Union | Texas |
| Coast Central Credit Union | California |
| Coast Guard Employees Credit Union | Louisiana |
| CoastHills Credit Union | California |
| Coastland Federal Credit Union | Louisiana |
| Coast Line Credit Union | Maine |
| Coastline Federal Credit Union | Florida |
| Coast National Bank | California |
| Coast-Tel Federal Credit Union | California |
| Coastway Community Bank | Rhode Island |
| Coatesville Savings Bank | Pennsylvania |
| Cobblestone Country Federal Credit Union | New York |
| CoBiz Bank | Colorado |
| Coburn Credit Union | Texas |
| Coca-Cola Credit Union | Georgia |
| Cochise Credit Union | Arizona |
| Cochran County Schools Federal Credit Union | Texas |
| Coconino Federal Credit Union | Arizona |
| Coconut Grove Bank | Florida |
| CODE Credit Union | Ohio |