| 21ST CENTURY BUILDING COMPANY | 800502391 | 2000-12-08 | Withdrawn | WEST BLOOMFIELD |
| 21ST CENTURY CABLE TV OF GRAND RAPIDS, INC. | 801014363 | 1999-12-28 | Dissolved | BINGHAM FARMS |
| 21ST CENTURY CAPITAL LLC | 801281774 | 2004-07-02 | Active | SOUTHFIELD |
| 21ST CENTURY CHAPLAINS NETWORK, INC | 800928693 | 2010-12-27 | Dissolved | ROSEVILLE |
| 21ST CENTURY CHEMICAL SPECIALTIES, L.L.C. | 801150994 | 2000-07-21 | Dissolved | DETROIT |
| 21ST CENTURY CLEANING SERVICE, LLC | 801117195 | 2000-02-18 | Active | TROY |
| 21ST CENTURY COACHING, LLC | 801706878 | 2012-09-12 | Active | LIVONIA |
| 21ST CENTURY COLLEGE BOUND TUTORIAL LLC | 801580998 | 2011-01-07 | Active | SOUTHFIELD |
| 21ST CENTURY COLLISION 1 LLC | 802469100 | 2020-06-23 | Active | CLINTON TWP |
| 21ST CENTURY COLLISION LLC | 802314337 | 2019-04-23 | Active | FLINT |
| 21ST CENTURY COLLISION, INC. | 800259947 | 2000-01-04 | Withdrawn | FARMINGTON HILLS |
| 21ST CENTURY COMMUNICATIONS INC. | 800089533 | 1994-03-02 | Withdrawn | MADISON HEIGHTS |
| 21ST CENTURY COMPUTER SERVICES, INC. | 800459448 | 1993-02-17 | Withdrawn | FARMINGTON HILLS |
| 21ST CENTURY COMPUTER SPECIALISTS, INC. | 800535101 | 1992-05-13 | Withdrawn | GRANDVILLE, |
| 21ST CENTURY COMPUTER TECHNOLOGY, INC. | 800006585 | 1993-07-30 | Withdrawn | LANSING |
| 21ST CENTURY COMPUTER TRAINING CENTERS, LLC | 801153367 | 2001-01-12 | Active | BELLEVILLE |
| 21ST CENTURY COMPUTERS, L.C. | 801106358 | 1998-03-25 | Active | HARTLAND |
| 21ST CENTURY COMPUTING COMPANY | 800255376 | 1985-06-12 | Withdrawn | BIRMINGHAM |
| 21ST CENTURY COMPUTING LLC | 801324704 | 2005-06-10 | Dissolved | INKSTER |
| 21ST CENTURY COMPUTING, LIMITED | 800519188 | 1991-12-10 | Withdrawn | SOUTHFIELD |
| 21ST CENTURY CONCEPTS LLC | 801873131 | 2011-09-19 | Active | EAST LANSING |
| 21ST CENTURY CONCEPTS, INC. | 801014122 | 1986-02-05 | Dissolved | NEW BUFFALO |
| 21ST CENTURY CONSTRUCTION COMPANY | 800337727 | 1995-09-25 | Withdrawn | DETROIT |
| 21ST CENTURY CONSULTING & SOFTWARE, INC. | 800517479 | 1992-04-29 | Withdrawn | SOUTHFIELD |
| 21ST CENTURY CONSULTING L.L.C. | 801505101 | 2009-05-27 | Active | CLARKSTON |
| 21ST CENTURY CONTRACTING, INC. | 800315165 | 1993-06-16 | Withdrawn | NEW BALTIMORE |
| 21ST CENTURY CORPORATION | 800371170 | 1987-02-11 | Withdrawn | MUSKEGON |
| 21ST CENTURY COUNSEL, PLLC | 801896889 | 2010-05-13 | Active | BERKLEY |
| 21ST CENTURY CP LLC | 801287976 | 2004-08-18 | Active | SOUTHFIELD |
| 21ST CENTURY CREATIONS, INC. | 800352722 | 1995-10-20 | Withdrawn | STERLING HEIGHTS |
| 21ST CENTURY DENTISTRY INC. | 800549855 | 1998-03-24 | Withdrawn | INKSTER |
| 21ST CENTURY DETROIT GROUP, INCORPORATED | 800816245 | 1989-03-01 | Dissolved | DETROIT |
| 21ST CENTURY DEVELOPMENT CORPORATION | 800070308 | 1976-11-18 | Withdrawn | SOUTHFIELD |
| 21ST CENTURY DEVELOPMENT, L.L.C. | 801083721 | 1996-08-02 | Active | TROY |
| 21ST CENTURY DISCO, INC. | 800195571 | 1979-07-30 | Withdrawn | NILES |
| 21ST CENTURY DISTRIBUTING, INC. | 800070749 | 1981-04-28 | Withdrawn | WARREN |
| 21ST CENTURY DUNDEE LLC | 801286892 | 2004-08-12 | Active | SOUTHFIELD |
| 21ST CENTURY ECONOMIC DEVELOPMENT CORPORATION | 800814883 | 1995-02-02 | Dissolved | DETROIT |
| 21ST CENTURY EDUCATION, INC. | 800587250 | 2002-01-25 | Withdrawn | KENTWOOD |
| 21ST CENTURY ELECTRIC, INC. | 800410763 | 1988-02-08 | Withdrawn | BIRMINGHAM |
| 21ST CENTURY ELECTRONICS, L.L.C. | 801192050 | 2002-02-04 | Active | SOUTHFIELD |
| 21ST CENTURY ELECTRONICS, L.L.C. | 801415284 | 2007-05-15 | Dissolved | HASLETT |
| 21ST CENTURY ELEGANT HOMES, LLC | 802561379 | 2020-12-14 | Active | SOUTHFIELD |
| 21ST CENTURY EMPOWERMENT, LLC | 801498446 | 2009-02-26 | Dissolved | SOUTHFIELD |
| 21ST CENTURY ENERGY, LLC | 801496902 | 2009-04-09 | Active | DETROIT |
| 21ST CENTURY ENGINES, INC. | 800445919 | 1988-04-27 | Withdrawn | MT. PLEASANT |
| 21ST CENTURY ENTERPRISES, INC. | 800454679 | 1997-01-06 | Withdrawn | DETROIT |
| 21ST CENTURY ETECH SOLUTIONS, LLC | 801155862 | 2000-08-28 | Active | GRAND RAPIDS |
| 21ST CENTURY EXPRESS, INC. | 800300819 | 2000-03-03 | Withdrawn | MUSKEGON |
| 21ST CENTURY F&I L.L.C. | 801199952 | 2002-04-08 | Active | DETROIT |