| U-1st Community Federal Credit Union | New Mexico |
| UALU 354 Federal Credit Union | Pennsylvania |
| UAP Employees Federal Credit Union | Ohio |
| UARK Federal Credit Union | Arkansas |
| UAW MO-KAN Federal Credit Union | Kansas |
| UBank | Tennessee |
| UBC Credit Union | Missouri |
| UBS Bank USA | Utah |
| UCB Credit Union | Utah |
| U-DEL Federal Credit Union | Delaware |
| UFCW Community Federal Credit Union | Pennsylvania |
| UFCW Local 1776 Federal Credit Union | Pennsylvania |
| UFCW Local 23 Federal Credit Union | Pennsylvania |
| UFCW Local #72 Federal Credit Union | Pennsylvania |
| UFirst Federal Credit Union | New York |
| U-Haul Federal Credit Union | Arizona |
| UHS Employees Federal Credit Union | New York |
| Uinta Bank | Wyoming |
| Uintah Credit Union | Utah |
| Ukrainian Federal Credit Union | New York |
| Ukrainian Future Credit Union | Michigan |
| Ukrainian National Federal Credit Union | New York |
| Ukrainian Selfreliance Federal Credit Union | Pennsylvania |
| Ukrainian Selfreliance Michigan Federal Credit Union | Michigan |
| Ukrainian Selfreliance New England Federal Credit Union | Connecticut |
| Ukrainian Selfreliance of Western Pennsylvania Federal Credit Union | Pennsylvania |
| Ulster Federal Credit Union | New York |
| Ulster Savings Bank | New York |
| Ultima Bank Minnesota | Minnesota |
| UMassFive College Federal Credit Union | Massachusetts |
| Umatilla County Federal Credit Union | Oregon |
| UMB Bank | Missouri |
| UMe Federal Credit Union | California |
| UMICO Federal Credit Union | New York |
| Umpqua Bank | Oregon |
| UNB Bank | Pennsylvania |
| UNCLE Credit Union | California |
| UniBank | Washington |
| UniBank for Savings | Massachusetts |
| UNICO Bank | Missouri |
| UNI Credit Union | Iowa |
| Unified Communities Federal Credit Union | Michigan |
| Unified People's Federal Credit Union | Wyoming |
| Unilever Federal Credit Union | New Jersey |
| Union Bank | Tennessee |
| Union Bank | Vermont |
| Union Bank | Michigan |
| Union Bank | West Virginia |
| Union Bank | California |
| Union Bank of Blair | Wisconsin |
| Union Bank & Trust | Nebraska |
| Union Bank & Trust | Minnesota |
| Union Bank & Trust | Virginia |
| Union Bank & Trust Company | Arkansas |
| Union Bank & Trust Company | Tennessee |
| Union Bank & Trust Company | Wisconsin |
| Union Bank & Trust Company | North Carolina |
| Union Baptist Church Federal Credit Union | Indiana |
| Union Baptist Greenburgh Federal Credit Union | New York |
| Union Building and Loan Savings Bank | Pennsylvania |
| Union Building Trades Federal Credit Union | New Jersey |
| Union Community Bank | Pennsylvania |
| Union Congregational Federal Credit Union | New York |
| Union County Employees Federal Credit Union | New Jersey |
| Union County Savings Bank | New Jersey |
| Union Federal Credit Union | Louisiana |
| Union Federal Savings and Loan Association | Illinois |
| Union Fidelity Federal Credit Union | Texas |
| Union Memorial Credit Union | Missouri |
| Union National Bank of Elgin | Illinois |
| Union National Bank & Trust Company | Wisconsin |
| Union Oil Santa Fe Springs Employees Federal Credit Union | California |
| Union Pacific California Employees Federal Credit Union | California |
| Union Pacific Employees Credit Union | Texas |
| Union Pacific of Arkansas Federal Credit Union | Arkansas |
| Union Pacific Streamliner Federal Credit Union | Nebraska |
| Union Savings and Loan Association | Louisiana |
| Union Savings and Loan Association | Indiana |
| Union Savings Bank | Connecticut |
| Union Savings Bank | Illinois |
| Union Savings Bank | Ohio |
| Union Square Federal Credit Union | Texas |
| Union State Bank | Kansas |
| Union State Bank | Alabama |
| Union State Bank | Iowa |
| Union State Bank | Texas |
| Union State Bank | Wisconsin |
| Union State Bank | Iowa |
| Union State Bank | Kansas |
| Union State Bank | Kansas |
| Union State Bank | Kansas |
| Union State Bank of Browns Valley | Minnesota |
| Union State Bank of Fargo | North Dakota |
| Union State Bank of Hazen | North Dakota |
| Union State Bank of West Salem | Wisconsin |
| Union Trades Federal Credit Union | West Virginia |
| Union Wallowa Baker Federal Credit Union | Oregon |
| Union Yes Federal Credit Union | California |
| Unison Bank | North Dakota |
| Unison Credit Union | Wisconsin |