Exhibit 21

TELEPHONE AND DATA SYSTEMS, INC.

SUBSIDIARY COMPANIES

December 31, 2018

SUBSIDIARY COMPANIES		STATE OF ORGANIZATION
U.S. CELLULAR
	UNITED STATES CELLULAR CORPORATION	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
	INDIANA RSA # 5, INC.	INDIANA
	INDIANA RSA NO. 4 LIMITED PARTNERSHIP	INDIANA
	INDIANA RSA NO. 5 LIMITED PARTNERSHIP	INDIANA
	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
	LAB465, LLC	ILLINOIS
	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
	TENNESSEE NO. 3, LIMITED PARTNERSHIP	TENNESSEE
	TEXAHOMA CELLULAR LIMITED PARTNERSHIP	TEXAS
	TEXAS INVCO OF RSA # 6, INC.	DELAWARE
	TOWNSHIP CELLULAR TELEPHONE, INC.	DELAWARE
	UNITED STATES CELLULAR INVESTMENT CO. OF OKLAHOMA CITY, LLC.	OKLAHOMA
	UNITED STATES CELLULAR INVESTMENT COMPANY, LLC	DELAWARE
	UNITED STATES CELLULAR INVESTMENT CORPORATION OF LOS ANGELES	INDIANA
	UNITED STATES CELLULAR OPERATING COMPANY LLC	DELAWARE
	UNITED STATES CELLULAR OPERATING COMPANY OF BANGOR	MAINE
	UNITED STATES CELLULAR OPERATING COMPANY OF CEDAR RAPIDS	DELAWARE
	UNITED STATES CELLULAR OPERATING COMPANY OF CHICAGO, LLC	DELAWARE

	UNITED STATES CELLULAR OPERATING COMPANY OF DUBUQUE	IOWA
	UNITED STATES CELLULAR OPERATING COMPANY OF KNOXVILLE	TENNESSEE
	UNITED STATES CELLULAR OPERATING COMPANY OF MEDFORD	OREGON
	UNITED STATES CELLULAR OPERATING COMPANY OF YAKIMA	WASHINGTON
	UNITED STATES CELLULAR TELEPHONE COMPANY (GREATER KNOXVILLE), L.P.	TENNESSEE
	USCC DISTRIBUTION CO., LLC	DELAWARE
	USCC EIP LLC	DELAWARE
	USCC FINANCIAL L.L.C.	ILLINOIS
	USCC FIRST RESPONDER, INC.	DELAWARE
	USCC MASTER NOTE TRUST	DELAWARE
	USCC PURCHASE, LLC	DELAWARE
	USCC RECEIVABLES FUNDING LLC	DELAWARE
	USCC SERVICES, LLC	DELAWARE
	USCC WIRELESS INVESTMENT, INC.	DELAWARE
	USCCI CORPORATION	DELAWARE
	USCIC OF FRESNO	CALIFORNIA
	USCOC NEBRASKA/KANSAS, INC.	DELAWARE
	USCOC NEBRASKA/KANSAS, LLC	DELAWARE
	USCOC OF CENTRAL ILLINOIS, LLC	ILLINOIS
	USCOC OF CHICAGO REAL ESTATE HOLDINGS, LLC	DELAWARE
	USCOC OF CUMBERLAND, LLC	DELAWARE
	USCOC OF GREATER IOWA, LLC	DELAWARE
	USCOC OF GREATER MISSOURI, LLC	DELAWARE
	USCOC OF GREATER NORTH CAROLINA, LLC	DELAWARE
	USCOC OF GREATER OKLAHOMA, LLC	OKLAHOMA
	USCOC OF JACK/WIL, INC.	DELAWARE
	USCOC OF JACKSONVILLE, LLC	DELAWARE
	USCOC OF LACROSSE, LLC	WISCONSIN
	USCOC OF OREGON RSA # 5, INC.	DELAWARE
	USCOC OF PENNSYLVANIA RSA NO. 10-B2, LLC	DELAWARE
	USCOC OF RICHLAND, INC.	WASHINGTON
	USCOC OF ROCHESTER, INC.	DELAWARE
	USCOC OF SOUTH CAROLINA RSA # 4, INC.	SOUTH CAROLINA
	USCOC OF TEXAHOMA, INC.	TEXAS
	USCOC OF VIRGINIA RSA # 3, INC.	VIRGINIA
	USCOC OF WASHINGTON-4, 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
	AMELIA TELEPHONE CORPORATION	VIRGINIA
	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
CONCORD TELEPHONE EXCHANGE, INC.	TENNESSEE
CONTINENTAL TELEPHONE COMPANY	OHIO
DELTA COUNTY TELE-COMM, INC.	COLORADO
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 COMPANY	WASHINGTON
MERRIMACK COUNTY TELEPHONE COMPANY	NEW HAMPSHIRE
MID-AMERICA TELEPHONE, LLC	OKLAHOMA
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
NEW CASTLE TELEPHONE COMPANY	VIRGINIA

	NORTHFIELD TELEPHONE COMPANY	VERMONT
	NORWAY TELEPHONE COMPANY, INC.	SOUTH CAROLINA
	OAKMAN TELEPHONE COMPANY, INC.	ALABAMA
	OAKWOOD TELEPHONE COMPANY	OHIO
	OKLAHOMA COMMUNICATION SYSTEMS, LLC	OKLAHOMA
	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
	STRASBURG TELEPHONE COMPANY	COLORADO
	SUGAR VALLEY TELEPHONE COMPANY	PENNSYLVANIA
	TELLICO TELEPHONE COMPANY, INC.	TENNESSEE
	TENNESSEE TELEPHONE COMPANY	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
	TDS LONG DISTANCE CORPORATION	DELAWARE

	TDS METROCOM, LLC	DELAWARE
	TDS TELECOM SERVICE LLC	IOWA
	TRI-COUNTY COMMUNICATIONS CORPORATION	INDIANA
TDS GROUP
	AFFILIATE FUND	DELAWARE
	AIRADIGM COMMUNICATIONS, INC.	WISCONSIN
	INTERLINX COMMUNICATION, LLC	DELAWARE
	M.C.T. COMMUNICATIONS, INC.	NEW HAMPSHIRE
	NATIONAL TELEPHONE & TELEGRAPH COMPANY	DELAWARE
	ONENECK DATA CENTER HOLDINGS LLC	DELAWARE
	ONENECK IT SERVICES CORPORATION	DELAWARE
	ONENECK IT SOLUTIONS LLC	DELAWARE
	ONENECK UK LIMITED	UNITED KINGDOM
	SUTTLE-STRAUS, INC.	WISCONSIN
	TDS BROADBAND  LLC	DELAWARE
	TDS BROADBAND SERVICE LLC	DELAWARE
	ZOLO BROADCASTING LLC	DELAWARE
	TONAQUINT NETWORKS, LLC	DELAWARE