| 21ST AVENUE INVESTORS, LLC | — | 001054273 | 2019-09-30 | Active | INDIANAPOLIS |
| 21ST AVENUE NORTH, LLC | — | 000802756 | 2015-06-09 | Dissolved | NASHVILLE |
| 21ST AVENUE PARTNERS, LLC | — | 000679356 | 2012-02-17 | Active | INDIANAPOLIS |
| 21ST AVENUE PROPERTIES, LLC | — | 000307246 | 1996-02-09 | Merged | NASHVILLE |
| 21ST CENTER YOUTH DAY-CARE, INC. | — | 000222058 | 1989-11-09 | Dissolved | MEMPHIS |
| 21ST CENTURY ACADEMY & DAYCARE, INC. | — | 000409396 | 2001-06-07 | Dissolved | CLEVELAND |
| 21ST CENTURY ACADEMY FOUNDATION | — | 000469717 | 2004-05-14 | Dissolved | CHATTANOOGA |
| 21ST CENTURY ADVERTISING INC. | — | 000117334 | 1982-06-14 | Dissolved | MEMPHIS |
| 21ST CENTURY AESTHETIC DENISTRY PLLC | — | 000628326 | 2010-04-12 | Dissolved | NASHVILLE |
| 21ST CENTURY APPAREL, INC. | — | 000237344 | 1991-02-12 | Dissolved | CLEVELAND |
| 21ST CENTURY ASSOCIATES, LLC | — | 000320672 | 1996-11-13 | Dissolved | ATHENS |
| 21ST CENTURY AVIATION, INC. | — | 000063924 | 1979-03-26 | Revoked | MEMPHIS |
| 21ST CENTURY BOOKKEEPER, LLC | — | 002016657 | 2025-04-24 | Dissolved | Collierville |
| 21ST CENTURY BROADBAND SERVICES | — | 000858205 | 2016-07-21 | Active | ROBBINS |
| 21ST CENTURY BUILDERS, INC | — | 000559889 | 2007-09-28 | Revoked | NASHVILLE |
| 21ST CENTURY BUILDERS, INC. | — | 000412188 | 2001-08-06 | Dissolved | GRAY |
| 21ST CENTURY BUILDING OF TENNESSEE, INC | — | 000367174 | 1999-03-08 | Dissolved | JAMESTOWN |
| 21ST CENTURY CHILD DEVELOPMENT AND LEARNING CENTER, INC. | — | 000367636 | 1999-03-15 | Active | CHATTANOOGA |
| 21ST CENTURY CHILD DEVELOPMENT CENTER, INC. | — | 000330770 | 1997-05-12 | Dissolved | CHATTANOOGA |
| 21ST CENTURY CHILD DEVELOPMENT CENTER, LLC | — | 000330103 | 1997-04-24 | Dissolved | CHATTANOOGA |
| 21ST CENTURY CHIROPRACTIC SUPPLY LLC | — | 002019543 | 2025-05-06 | Dissolved | Knoxville |
| 21ST CENTURY CHIROPRACTIC, P.C. | — | 000419136 | 2001-12-21 | Dissolved | MONTEAGLE |
| 21ST CENTURY CHRISTIAN INC. | Retail trade | 000032440 | 1955-07-27 | Active | NASHVILLE |
| 21ST CENTURY CHRISTIAN RENAISSANCE CAMPUS MINISTRIES, INC. | — | 000171661 | 1986-04-25 | Dissolved | OAK RIDGE |
| 21ST CENTURY CHURCH FINANCING, INC. | — | 000370524 | 1999-05-07 | Dissolved | COLLIERVILLE |
| 21ST CENTURY CLUB OF AMERICA, INC. | — | 000215586 | 1989-05-08 | Dissolved | MEMPHIS |
| 21ST CENTURY COMMUNICATIONS OF TN INC. | — | 000333958 | 1997-07-09 | Dissolved | MEMPHIS |
| 21ST CENTURY COMMUNICATIONS, INC. | — | 000267369 | 1993-06-25 | Dissolved | NASHVILLE |
| 21ST CENTURY COMMUNITIES, INC. | — | 000993786 | 2018-11-06 | Revoked | LAS VEGAS |
| 21ST CENTURY COMPUTER SPECIALISTS, INC. | — | 000307830 | 1996-02-21 | Revoked | GRAND RAPIDS |
| 21ST CENTURY COMPUTERS, INC. | — | 000294258 | 1995-05-03 | Dissolved | MEMPHIS |
| 21ST CENTURY CONCEPTS, INC | — | 000392749 | 2000-07-20 | Dissolved | COLLIERVILLE |
| 21ST CENTURY CONCEPTS, LLC | — | 000597282 | 2009-02-27 | Revoked | BRADENTON |
| 21ST CENTURY DAY SERVICES | — | 000326286 | 1997-02-28 | Dissolved | GALLATIN |
| 21ST CENTURY DECORATING, INC. | — | 000436569 | 2002-11-13 | Active | TULLAHOMA |
| 21ST CENTURY DEVELOPERS, INC. | — | 000408099 | 2001-05-14 | Dissolved | LEXINGTON |
| 21ST CENTURY DEVELOPMENT CORPORATION | — | 000283995 | 1994-09-19 | Dissolved | NASHVILLE |
| 21ST CENTURY DEVELOPMENT CORPORATION | — | 000064856 | 1979-04-24 | Revoked | MEMPHIS |
| 21ST CENTURY DEVELOPMENT LLC | — | 000598286 | 2009-03-13 | Dissolved | CLARKSVILLE |
| 21ST CENTURY EDUCATIONAL FOUNDATION | — | 000313169 | 1996-06-10 | Active | WAVERLY |
| 21ST CENTURY ELECTRIC, INC. | — | 000338390 | 1997-10-01 | Dissolved | SMYRNA |
| 21ST CENTURY ENTERPRISES, INC. | — | 000287741 | 1994-12-16 | Revoked | CLARKSVILLE |
| 21ST CENTURY ENTERPRISES, INC. | — | 000106098 | 1981-07-23 | Dissolved | KNOXVILLE |
| 21ST CENTURY ENTERTAINMENT, INC. | — | 000405953 | 2001-03-30 | Dissolved | LEXINGTON |
| 21ST CENTURY ENVIRONMENTAL SYSTEMS, INC. | — | 000255841 | 1992-07-28 | Dissolved | KNOXVILLE |
| 21ST CENTURY FINANCIAL SERVICES, INC. | — | 000435517 | 2002-10-23 | Dissolved | NASHVILLE |
| 21ST CENTURY FREIGHT LINE INC | — | 001113094 | 2020-07-20 | Dissolved | MEMPHIS |
| 21ST CENTURY HEALTH CARE CLINIC PLLC | — | 000472541 | 2004-06-28 | Dissolved | MURFREESBORO |
| 21ST CENTURY HEALTH INFORMATION LLC | — | 002021001 | 2025-05-12 | Active | Brentwood |
| 21ST CENTURY HEALTH SPA, INC. | — | 000104992 | 1981-06-25 | Merged | MEMPHIS |