| 21ST CENTURY LIONS, L.L.C. | 801174362 | 2001-05-11 | Active | FARMINGTON HILLS |
| 21ST CENTURY LOGISTICS INC. | 800403760 | 2000-02-29 | Withdrawn | CENTER LINE |
| 21ST CENTURY MARKETING COMPANY, INC. | 800484058 | 1993-04-21 | Withdrawn | LINCOLN PARK |
| 21ST CENTURY MARKETING GROUP, INC. | 800468160 | 1997-01-16 | Withdrawn | STERLING HEIGHTS |
| 21ST CENTURY MARKETING SYSTEMS, LLC | 801426017 | 2007-09-04 | Dissolved | WATERFORD |
| 21ST CENTURY MARKETING, INC. | 800320315 | 1989-12-26 | Withdrawn | GRAND RAPIDS |
| 21ST CENTURY MEDIA (CM) , INC. | 801065059 | 2013-05-17 | Active | PLYMOUTH |
| 21ST CENTURY MEDIA NEWSPAPER, LLC | 801876678 | 2013-04-26 | Active | PLYMOUTH |
| 21ST CENTURY MEDIA, LLC | 801541025 | 2010-02-26 | Active | MACKINAW CITY |
| 21ST CENTURY MIGRATION SERVICES, INC. | 800497543 | 1997-07-25 | Withdrawn | GRAND RAPIDS |
| 21ST CENTURY MORTGAGE CORPORATION | 800086626 | 1994-02-25 | Withdrawn | BLOOMFIELD |
| 21ST CENTURY NETWORKS, LLC | 801374382 | 2006-07-03 | Active | GREGORY |
| 21ST CENTURY NEWSPAPERS SHARED SERVICES, LLC | 801254320 | 2004-01-01 | Dissolved | TROY |
| 21ST CENTURY NEWSPAPERS, INC. | 801032192 | 1997-08-20 | Dissolved | TROY |
| 21ST CENTURY NEWSPAPERS, L.L.C. | 801856476 | 1995-12-08 | Dissolved | WILMINGTON |
| 21ST CENTURY NOW INC. | 800085305 | 1994-02-22 | Withdrawn | SOUTHFIELD |
| 21ST CENTURY NURSING, INC. | 800461268 | 1990-04-24 | Withdrawn | GRAND RAPIDS |
| 21ST CENTURY OPTIMIST CLUB | 800922484 | 2009-06-23 | Dissolved | W. BLOOMFIELD |
| 21ST CENTURY OUTREACH LLC | 802871989 | 2022-06-17 | Active | BATTLE CREEK |
| 21ST CENTURY PARADIGM SHIFT LLC | 801507625 | 2009-09-10 | Active | ANN ARBOR |
| 21ST CENTURY PERFORMANCE LLC | 801455867 | 2008-04-18 | Active | FLINT |
| 21ST CENTURY PERSONNEL SOLUTIONS, INC. | 800543888 | 1998-06-02 | Withdrawn | AUBURN HILLS |
| 21ST CENTURY PETS, INC. | 800539603 | 1991-10-15 | Withdrawn | WESTLAND |
| 21ST CENTURY PLASTICS CORPORATION | 800366048 | 1988-02-23 | Active | POTTERVILLE |
| 21ST CENTURY PLASTICS RESOURCES, LLC | 801303911 | 2004-12-13 | Dissolved | POTTERVILLE |
| 21ST CENTURY POLYMERS & ASSOCIATES INC. | 800605021 | 2002-11-08 | Withdrawn | TRAVERSE CITY |
| 21ST CENTURY POOL TECHNOLOGIES, INC. | 800506444 | 1992-04-01 | Withdrawn | LIVONIA |
| 21ST CENTURY PREVENTIVE HEALTH INC. | 800052132 | 1999-01-08 | Withdrawn | STEPHENSON |
| 21ST CENTURY PRODUCTION, LLC | 801828740 | 2015-06-03 | Active | EATON RAPIDS |
| 21ST CENTURY PRODUCTIONS, INC. | 800005848 | 1998-12-03 | Withdrawn | SOUTHFIELD |
| 21ST CENTURY PRODUCTS LLC | 802178297 | 2018-03-26 | Active | SOUTHFIELD |
| 21ST CENTURY PROPERTIES INCORPORATED | 800239223 | 1999-10-15 | Withdrawn | DETROIT |
| 21ST CENTURY PROPERTY SERVICES GROUP, INC. | 800670968 | 2006-04-26 | Withdrawn | WEST BLOOMFIELD |
| 21ST CENTURY PUBLIC CONSULTANTS, L.L.C. | 801117050 | 1999-03-03 | Dissolved | TAWAS CITY |
| 21ST CENTURY PUBLIC CONSULTANTS, LTD. | 800178455 | 1985-01-07 | Withdrawn | SHELBYVILLE |
| 21ST CENTURY PUBLISHING CO. | 800408291 | 1996-05-15 | Withdrawn | DETROIT |
| 21ST CENTURY REAL ESTATE , INC. | 800770628 | 2014-04-01 | Active | NORTHVILLE |
| 21ST CENTURY REAL ESTATE INVESTMENTS INC. | 800759249 | 2015-08-18 | Withdrawn | FERNDALE |
| 21ST CENTURY REAL ESTATE INVESTMENTS LLC | 801536469 | 2010-03-22 | Active | DETROIT |
| 21ST CENTURY REAL ESTATE PROPERTIES, INC. | 800090504 | 1994-03-09 | Withdrawn | FLINT |
| 21ST CENTURY REAL ESTATE, LLC | 801271116 | 2004-04-21 | Active | SOUTHFIELD |
| 21ST CENTURY REALTY INVESTORS, LLC | 802388590 | 2019-11-25 | Active | — |
| 21ST CENTURY REHAB SERVICES INC. | 800346227 | 2000-09-07 | Withdrawn | STERLING HEIGHTS |
| 21ST CENTURY RESOURCES GROUP, LLC | 801241750 | 2003-06-25 | Active | WEST BLOOMFIELD |
| 21ST CENTURY RESOURCES, INC. | 800432854 | 1993-06-07 | Withdrawn | COMMERCE TWP |
| 21ST CENTURY ROOFING CORPORATION | 800429774 | 1993-02-03 | Withdrawn | CONWAY |
| 21ST CENTURY SALON, LLC | 802119229 | 2017-10-27 | Active | FRANKLIN |
| 21ST CENTURY SALVAGE, INC. | 800469866 | 1997-02-21 | Active | YPSILANTI |
| 21ST CENTURY SCHOOLS PROJECT | 800917908 | 2008-06-30 | Dissolved | LANSING |
| 21ST CENTURY SECURITIES INC. | 800044330 | 1999-02-12 | Withdrawn | GRAND RAPIDS |