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Exhibit 21
TELEPHONE AND DATA SYSTEMS, INC.
SUBSIDIARY COMPANIES
December 31, 2025
 
SUBSIDIARY COMPANIES STATE OF ORGANIZATION
    
ARRAY DIGITAL INFRASTRUCTURE, INC.  
 ARRAY DIGITAL INFRASTRUCTURE, INC. DELAWARE
ADI FINANCIAL, LLCILLINOIS
ADI HOLDING COMPANY, LLCDELAWARE
ADI INVESTMENT COMPANY OF FRESNOCALIFORNIA
ADI INVESTMENT COMPANY OF LOS ANGELES, INC.INDIANA
ADI INVESTMENT COMPANY OF OKLAHOMA CITY, LLCOKLAHOMA
ADI INVESTMENT COMPANY, LLCDELAWARE
ADI INVESTMENT CORPORATIONDELAWARE
ADI LEASING COMPANY, LLCDELAWARE
ADI MANAGEMENT SERVICES, LLCDELAWARE
ADI OPERATING COMPANY, LLCDELAWARE
ADI WIRELESS INVESTMENT, INC.DELAWARE
ADIOC NEBRASKA/KANSAS, INC.DELAWARE
ADIOC NEBRASKA/KANSAS, LLCDELAWARE
ADIOC OF BANGOR, INC.MAINE
ADIOC OF CEDAR RAPIDS, INC.DELAWARE
ADIOC OF CENTRAL ILLINOIS, LLCILLINOIS
ADIOC OF CUMBERLAND, LLCDELAWARE
ADIOC OF DUBUQUE, INC.IOWA
ADIOC OF GREATER IOWA, LLCDELAWARE
ADIOC OF GREATER MISSOURI, LLCDELAWARE
ADIOC OF GREATER NORTH CAROLINA, LLCDELAWARE
ADIOC OF GREATER OKLAHOMA, LLCOKLAHOMA
ADIOC OF JACKSONVILLE, LLCDELAWARE
ADIOC OF KNOXVILLE, INC.TENNESSEE
ADIOC OF LACROSSE, LLCDELAWARE
ADIOC OF MEDFORD, INC.OREGON
ADIOC OF OREGON RSA # 5, INC.DELAWARE
ADIOC OF PENNSYLVANIA RSA NO. 10-B2, LLCDELAWARE
ADIOC OF RICHLAND, INC.WASHINGTON
ADIOC OF SOUTH CAROLINA RSA # 4, INC.SOUTH CAROLINA
ADIOC OF VIRGINIA RSA # 3, INC.VIRGINIA
ADIOC OF WASHINGTON-4, INC.DELAWARE
ADIOC OF YAKIMA, INC.WASHINGTON
ADVANTAGE SPECTRUM, L.P.DELAWARE
 BANGOR CELLULAR TELEPHONE, L.P. DELAWARE
 CALIFORNIA RURAL SERVICE AREA #1, INC. CALIFORNIA
 CEDAR RAPIDS CELLULAR TELEPHONE, L.P. DELAWARE
 CELLVEST, INC. DELAWARE
 CENTRAL CELLULAR TELEPHONES, LTD. ILLINOIS
 CHAMPLAIN CELLULAR, INC. NEW YORK
 COMMUNITY CELLULAR TELEPHONE COMPANY TEXAS


 CROWN POINT CELLULAR, INC. NEW YORK
 DUBUQUE CELLULAR TELEPHONE, L.P. DELAWARE
 HARDY CELLULAR TELEPHONE COMPANY DELAWARE
 IOWA RSA # 3, INC. DELAWARE
 IOWA RSA # 9, INC. DELAWARE
 IOWA RSA # 12, INC. DELAWARE
 JACKSONVILLE CELLULAR PARTNERSHIP NORTH CAROLINA
 JACKSONVILLE CELLULAR TELEPHONE COMPANY NORTH CAROLINA
 KANSAS #15 LIMITED PARTNERSHIP DELAWARE
 KENOSHA CELLULAR TELEPHONE, L.P. DELAWARE
KING STREET WIRELESS, LLCDELAWARE
KING STREET WIRELESS, L.P.DELAWARE
 MADISON CELLULAR TELEPHONE COMPANY WISCONSIN
 MAINE RSA # 1, INC. MAINE
 MAINE RSA # 4, INC. MAINE
 MCDANIEL CELLULAR TELEPHONE COMPANY DELAWARE
 MINNESOTA INVCO OF RSA # 7, INC. DELAWARE
 NEWPORT CELLULAR, INC. NEW YORK
 NH #1 RURAL CELLULAR, INC. NEW HAMPSHIRE
 OREGON RSA #2, INC. OREGON
 PCS WISCONSIN, LLC WISCONSIN
 RACINE CELLULAR TELEPHONE COMPANY WISCONSIN
SUNSHINE SPECTRUM, LLCDELAWARE
 TEXAS INVCO OF RSA # 6, INC. DELAWARE
 TOWNSHIP CELLULAR TELEPHONE, INC. DELAWARE
 VERMONT RSA NO. 2-B2, INC. DELAWARE
 WASHINGTON RSA # 5, INC. WASHINGTON
 WESTELCOM CELLULAR, INC. NEW YORK
 WESTERN SUB-RSA LIMITED PARTNERSHIP DELAWARE
 YAKIMA MSA LIMITED PARTNERSHIP DELAWARE
    
TDS TELECOMMUNICATIONS  
 TDS TELECOMMUNICATIONS LLC DELAWARE
    
INCUMBENT LOCAL EXCHANGE COMPANIES  
 ARCADIA TELEPHONE COMPANY OHIO
 ARIZONA TELEPHONE COMPANY ARIZONA
 ARVIG TELEPHONE COMPANY MINNESOTA
 ASOTIN TELEPHONE COMPANY WASHINGTON
 BADGER TELECOM, LLC DELAWARE
 BLACK EARTH TELEPHONE COMPANY, LLC DELAWARE
 BLUE RIDGE TELEPHONE COMPANY GEORGIA
 BONDUEL TELEPHONE COMPANY, LLC DELAWARE
 BRIDGE WATER TELEPHONE COMPANY MINNESOTA
 BURLINGTON, BRIGHTON & WHEATLAND TELEPHONE COMPANY, LLC DELAWARE
 BUTLER TELEPHONE COMPANY, INC. ALABAMA
 CALHOUN CITY TELEPHONE COMPANY, INC. MISSISSIPPI
 CAMDEN TELEPHONE AND TELEGRAPH COMPANY, INC. GEORGIA
 CAMDEN TELEPHONE COMPANY, INC. INDIANA
 CENTRAL STATE TELEPHONE COMPANY, LLC DELAWARE
 CHATHAM TELEPHONE COMPANY MICHIGAN


 COBBOSSEECONTEE TELEPHONE COMPANY MAINE
 COMMUNICATION CORPORATION OF MICHIGAN MICHIGAN
 COMMUNICATIONS CORPORATION OF INDIANA INDIANA
 COMMUNICATIONS CORPORATION OF SOUTHERN INDIANA INDIANA
 CONTINENTAL TELEPHONE COMPANY OHIO
 DEPOSIT TELEPHONE COMPANY, INC. NEW YORK
 DICKEYVILLE TELEPHONE, LLC DELAWARE
 EASTCOAST TELECOM OF WISCONSIN, LLC DELAWARE
 EDWARDS TELEPHONE COMPANY, INC. NEW YORK
 GRANTLAND TELECOM, LLC DELAWARE
 HAMPDEN TELEPHONE COMPANY MAINE
 HAPPY VALLEY TELEPHONE COMPANY CALIFORNIA
 HARTLAND & ST. ALBANS TELEPHONE COMPANY MAINE
 HOLLIS TELEPHONE COMPANY, INC. NEW HAMPSHIRE
 HOME TELEPHONE COMPANY, INC. INDIANA
 HORNITOS TELEPHONE CO. CALIFORNIA
 HUMPHREYS COUNTY TELEPHONE COMPANY TENNESSEE
 ISLAND TELEPHONE COMPANY MICHIGAN
 KEARSARGE TELEPHONE COMPANY NEW HAMPSHIRE
 LESLIE COUNTY TELEPHONE COMPANY KENTUCKY
 LEWIS RIVER TELEPHONE COMPANY, INC. WASHINGTON
 LEWISPORT TELEPHONE COMPANY KENTUCKY
 LITTLE MIAMI COMMUNICATIONS CORPORATION OHIO
 LUDLOW TELEPHONE COMPANY VERMONT
 MAHANOY & MAHANTANGO TELEPHONE COMPANY PENNSYLVANIA
 MCCLELLANVILLE TELEPHONE COMPANY, INC. SOUTH CAROLINA
 MCDANIEL TELEPHONE CO. WASHINGTON
 MERRIMACK COUNTY TELEPHONE COMPANY NEW HAMPSHIRE
 MID-PLAINS TELEPHONE, LLC DELAWARE
 MID-STATE TELEPHONE COMPANY MINNESOTA
 MIDWAY TELEPHONE COMPANY, LLC DELAWARE
 MOSINEE TELEPHONE COMPANY, LLC DELAWARE
 MT. VERNON TELEPHONE COMPANY, LLC DELAWARE
 MYRTLE TELEPHONE COMPANY, INC. MISSISSIPPI
 NELSON-BALL GROUND TELEPHONE COMPANY GEORGIA
 NORTHFIELD TELEPHONE COMPANY VERMONT
 NORWAY TELEPHONE COMPANY, INC. SOUTH CAROLINA
 OAKMAN TELEPHONE COMPANY, INC. ALABAMA
 OAKWOOD TELEPHONE COMPANY OHIO
 PEOPLES TELEPHONE COMPANY, INC. ALABAMA
 PERKINSVILLE TELEPHONE COMPANY, INC. VERMONT
 PORT BYRON TELEPHONE COMPANY NEW YORK
 POTLATCH TELEPHONE COMPANY IDAHO
 QUINCY TELEPHONE COMPANY FLORIDA
 RIVERSIDE TELECOM, LLC DELAWARE
 S & W TELEPHONE COMPANY, INC. INDIANA
 SALEM TELEPHONE COMPANY KENTUCKY
 SCANDINAVIA TELEPHONE COMPANY, LLC DELAWARE
 SHIAWASSEE TELEPHONE COMPANY MICHIGAN
 SOMERSET TELEPHONE COMPANY MAINE
 SOUTHEAST MISSISSIPPI TELEPHONE COMPANY, INC. MISSISSIPPI


 SOUTHEAST TELEPHONE CO. OF WISCONSIN, LLC DELAWARE
 SOUTHWESTERN TELEPHONE COMPANY ARIZONA
 ST. STEPHEN TELEPHONE COMPANY SOUTH CAROLINA
 STOCKBRIDGE & SHERWOOD TELEPHONE COMPANY, LLC. DELAWARE
 SUGAR VALLEY TELEPHONE COMPANY PENNSYLVANIA
 TELLICO TELEPHONE COMPANY, INCORPORATED TENNESSEE
 TENNEY TELEPHONE COMPANY, LLC DELAWARE
 THE FARMERS TELEPHONE COMPANY, LLC DELAWARE
 THE HOME TELEPHONE COMPANY OF PITTSBORO, INC. INDIANA
 THE ISLAND TELEPHONE COMPANY MAINE
 THE MERCHANTS AND FARMERS TELEPHONE COMPANY INDIANA
 THE STATE LONG DISTANCE TELEPHONE COMPANY, LLC DELAWARE
 THE VANLUE TELEPHONE COMPANY OHIO
 THE WEST PENOBSCOT TELEPHONE & TELEGRAPH COMPANY MAINE
 TIPTON TELEPHONE COMPANY, INC. INDIANA
 TOWNSHIP TELEPHONE COMPANY, INC. NEW YORK
 TRI-COUNTY TELEPHONE COMPANY, INC. INDIANA
 UNION TELEPHONE COMPANY NEW HAMPSHIRE
 UTELCO, LLC DELAWARE
 VERNON TELEPHONE COMPANY, INC. NEW YORK
 VIRGINIA TELEPHONE COMPANY VIRGINIA
 WARREN TELEPHONE COMPANY MAINE
 WAUNAKEE TELEPHONE COMPANY, LLC DELAWARE
 WEST POINT TELEPHONE COMPANY, INCORPORATED INDIANA
 WILLISTON TELEPHONE COMPANY SOUTH CAROLINA
 WILTON TELEPHONE COMPANY, INC. NEW HAMPSHIRE
 WINSTED TELEPHONE COMPANY MINNESOTA
 WINTERHAVEN TELEPHONE COMPANY CALIFORNIA
 WOLVERINE TELEPHONE COMPANY MICHIGAN
    
OTHER COMPANIES  
 INTERLINX COMMUNICATION, LLC DELAWARE
 TDS BROADBAND LLC DELAWARE
 TDS BROADBAND SERVICE LLC DELAWARE
 TDS LONG DISTANCE CORPORATION DELAWARE
 TDS METROCOM, LLC DELAWARE
TDS PURCO LLCDELAWARE
 TDS TELECOM SERVICE LLC IOWA
 TONAQUINT NETWORKS, LLC DELAWARE
 TRI-COUNTY COMMUNICATIONS CORPORATION INDIANA
 ZOLO BROADCASTING LLC DELAWARE
    
TDS GROUP  
 AFFILIATE FUND DELAWARE
 AIRADIGM COMMUNICATIONS, INC. WISCONSIN
 NATIONAL TELEPHONE & TELEGRAPH COMPANY DELAWARE
 SUTTLE-STRAUS, INC. WISCONSIN