| 21ST CENTURY FLOOR COVERING LLC | — | 2008060200137 | 2008-06-02 | Dissolved | — |
| 21ST CENTURY FLOORING, LLC | — | 2012041000123 | 2012-04-09 | Active | NORTHLAKE |
| 21ST CENTURY FOODS INC | — | 198111-674 | 1981-11-25 | Dissolved | — |
| 21ST CENTURY GENETICS INC | — | 198309-265 | 1983-09-12 | Dissolved | — |
| 21ST CENTURY GREATER WORKS MINISTRY, INC. | — | 2011012100696 | 2011-01-19 | Active | — |
| 21ST CENTURY HEALTH SPA OF LOUISVILLE INC | — | 198205-058 | 1982-05-03 | Revoked | — |
| 21ST CENTURY HEALTH SYSTEMS, INC. | — | 1990080307 | 1990-08-06 | Dissolved | — |
| 21ST CENTURY HEALTHCARE | — | 2013011800334 | 2013-01-18 | Expired | — |
| 21ST CENTURY HEALTHCARE LLC | — | 2013013100058 | 2013-01-30 | Active | — |
| 21ST CENTURY HEATING & COOLING INC | — | 198310-359 | 1983-10-13 | Dissolved | — |
| 21ST CENTURY HEATING AND COOLING, LLC | — | 2007081000195 | 2007-08-10 | Dissolved | — |
| 21ST CENTURY IMPORT & EXPORT ASSOCIATION, INC. | — | 1999041615 | 1999-04-23 | Dissolved | — |
| 21ST CENTURY INDUSTRIAL CONTRACTORS INC | — | 197907-246 | 1979-07-09 | Dissolved | — |
| 21ST CENTURY INSURANCE & FINANCIAL SERVICES, INC. | — | 2004081600023 | 2004-08-13 | Expired | — |
| 21ST CENTURY INSURANCE ADVISORS LLC | — | 202404231785697 | 2024-04-23 | Active | Indianapolis |
| 21ST CENTURY INSURANCE AND FINANCIAL SERVICES, INC. | — | 198504-677 | 1985-04-18 | Withdrawn | WILMINGTON |
| 21ST CENTURY INTERNATIONAL ADVISORS, INC. | — | 2000020800312 | 2000-02-08 | Dissolved | — |
| 21ST CENTURY INVENTIONS, INC. | — | 2004092300008 | 2004-09-21 | Dissolved | — |
| 21ST CENTURY INVESTMENTS INC. | — | 2000010300457 | 1999-12-30 | Active | — |
| 21ST CENTURY LEADERSHIP POSEY COUNTY LTD. | — | 2001121100353 | 2001-12-06 | Active | — |
| 21ST CENTURY LEARNING COMMUNITIES, LLC | — | 2001042400899 | 2001-04-16 | Dissolved | — |
| 21ST CENTURY LEARNING LLC | — | 2010082600134 | 2010-08-26 | Dissolved | — |
| 21ST CENTURY LENDING INC. | — | 9998040038 | 1998-04-06 | Expired | — |
| 21ST CENTURY LENDING, INC. | — | 1998070014 | 1998-06-30 | Suspended | — |
| 21ST CENTURY LIQUOR LLC | — | 202309271728346 | 2023-09-27 | Dissolved | Fishers |
| 21ST CENTURY LOGISTICS, INCORPORATED | — | 2012053000052 | 2012-05-29 | Dissolved | — |
| 21ST CENTURY MANAGEMENT | — | 9997110006 | 1997-10-30 | Expired | — |
| 21ST CENTURY MANAGEMENT, INC | — | 1998030987 | 1998-03-12 | Dissolved | — |
| 21ST CENTURY MARKETING GROUP LLC | — | 2014033100310 | 2014-03-31 | Dissolved | — |
| 21ST CENTURY MARKETING, INC. | — | 198711-466 | 1987-11-13 | Revoked | — |
| 21ST CENTURY MEDICAL, INC. | — | 1992091005 | 1992-09-23 | Dissolved | — |
| 21ST CENTURY MEDICINE, LLC | — | 2000041000073 | 2000-03-30 | Expired | — |
| 21ST CENTURY MODULE MARKETING, INC. | — | 1988030308 | 1988-02-29 | Dissolved | — |
| 21ST CENTURY MORTGAGE, INC. | — | 1995120537 | 1995-12-11 | Dissolved | — |
| 21ST CENTURY MOTORS INC. | — | 2011050600382 | 2011-05-06 | Dissolved | — |
| 21ST CENTURY MOTORS INCORPORATED | — | 1998110036 | 1998-10-29 | Dissolved | — |
| 21ST CENTURY NET SALES, INC. | — | 2008010200883 | 2008-01-02 | Pending | — |
| 21ST CENTURY ONCOLOGY OF KENTUCKY, LLC | — | 2003091800477 | 2003-09-11 | Withdrawn | FORT MYERS |
| 21ST CENTURY PARENTS FOR QUALITY EDUCATION | — | 2011071100056 | 2011-07-10 | Expired | — |
| 21ST CENTURY PERSONNEL, LLC | — | 2000020800308 | 2000-02-08 | Dissolved | — |
| 21ST CENTURY PRINTING, L.L.C. | — | 1999020695 | 1999-02-09 | Dissolved | — |
| 21ST CENTURY PROPERTIES, L.L.C. | — | 1999061114 | 1999-06-15 | Dissolved | — |
| 21ST CENTURY RACING HOLDINGS LLC | — | 2005090700322 | 2005-09-06 | Revoked | — |
| 21ST CENTURY REHABILITATION OF INDIANA, INC. | — | 1993060526 | 1993-06-14 | Dissolved | — |
| 21ST CENTURY REHABILITATION, INC. | — | 1990011301 | 1990-01-26 | Dissolved | — |
| 21ST CENTURY REMODELERS, INC. | — | 198505-190 | 1985-05-06 | Dissolved | — |
| 21ST CENTURY REP SQUAD INC. | — | 2007051400288 | 2007-05-11 | Dissolved | — |
| 21ST CENTURY REPORTING, INC. | — | 2000051001322 | 2000-04-25 | Dissolved | — |
| 21ST CENTURY RESIDENTIAL HOUSING LLC | — | 2010021200973 | 2010-02-11 | Dissolved | — |
| 21ST CENTURY RESTORATIONS, INC. | — | 2003102800707 | 2003-10-27 | Dissolved | — |