| 137 Records | | | New Haven, Connecticut, United States | 1994 | 1996 | |
| Against All Odds Productions | | | Connecticut, United States | | | |
| Ambi Records | | | Darien, Connecticut, United States | | | |
| Ambient Records | Original Production | | Easton, Connecticut, United States | | | |
| American Melody | Original Production | | Guilford, Connecticut, United States | 1986 | | |
| American Radio Relay League | Publisher | | Newington, Connecticut, United States | 1914-04-06 | | |
| Art'spassion Records And Tapes | Imprint | | New London, Connecticut, United States | | | |
| Back on the Grind Records | | | Connecticut, United States | 2023-04-30 | | |
| Bella Records | | | Old Saybrook, Connecticut, United States | | [unknown] | |
| Bilge Dasto | | | Connecticut, United States | | | |
| BJW | Publisher | | Connecticut, United States | | | |
| Brain Police | | | New London, Connecticut, United States | | [unknown] | |
| BSE Recordings | Original Production | | Connecticut, United States | | | |
| But, It's Fine Records | Original Production | | Stratford, Connecticut, United States | | | |
| Carolyn Records | | | Milford, Connecticut, United States | | [unknown] | |
| Casa de Agua | | | New Haven, Connecticut, United States | | | |
| Co-Op Records | | | New Haven, Connecticut, United States | | [unknown] | |
| Cob Web Records | | | Fairfield, Connecticut, United States | | | |
| Columbia Records Pressing Plant, Bridgeport | | | Bridgeport, Connecticut, United States | | 1964-03 | |
| Crimewave Records | Distributor | | Connecticut, United States | 2022 | | |
| Darkghoul Studios | Production | | Connecticut, United States | | | |
| Dawn Records | | | Hartford, Connecticut, United States | | [unknown] | |
| Digital Ghosts Media | | | Connecticut, United States | | | |
| Direction | | | Connecticut, United States | | [unknown] | |
| Dog Man Records | | | Connecticut, United States | | | |
| Dord Music Group | | | New Haven, Connecticut, United States | 2014-07-14 | | |
| Earth House Records | Reissue Production | | Redding, Connecticut, United States | 1995 | | |
| Elm City Origins | Publisher | | New Haven, Connecticut, United States | 2017-01-01 | | |
| Emprise | Distributor | | Connecticut, United States | | | |
| Ephyra | Original Production | | Connecticut, United States | 2022 | | |
| Eschatonality | Publisher | | Bristol, Connecticut, United States | | | |
| Fake Four Inc. | Original Production | | New Haven, Connecticut, United States | 2008 | | |
| Firehouse 12 Records | Original Production | | New Haven, Connecticut, United States | 2007 | | |
| Free as Birds Records | | | New Haven, Connecticut, United States | | | |
| Frog Peak Music | Publisher | | Lebanon, Connecticut, United States | | | |
| Further Sky | Publisher | | Connecticut, United States | | | |
| Future City Records | | | New London, Connecticut, United States | 2011 | | |
| Hannah Lane Music | Production | | Connecticut, United States | | | |
| Happy Appy Records | | | Glastonbury, Connecticut, United States | | | |
| HMG Recording | Production | | Connecticut, United States | | | |
| Hub-Servall Record Mfg. Corp. | Manufacturer | | Cranbury, Connecticut, United States | 1970 | 2004 | |
| Ils | Original Production | | Norwalk, Connecticut, United States | 2012 | | |
| Klik Records | Publisher | | New Haven, Connecticut, United States | | | |
| Kraftjerkz | | | Connecticut, United States | 2007 | | |
| Lorido Music | Publisher | | Stamford, Connecticut, United States | | | |
| Martyr Records | Original Production | | West Haven, Connecticut, United States | 2001 | | |
| Melodic Mayhem Music | Original Production | | Monroe, Connecticut, United States | | | |
| Midnight Wolf Records | Production | | New Haven, Connecticut, United States | | | |
| Mystic Seaport | Publisher | | Mystic, Groton , Stonington, Connecticut, United States | 1929-12-25 | | |
| Noisy Records and Tapes | | | Connecticut, United States | | | |
| Northern Void Records | | | New Haven, Connecticut, United States | | | |
| One Time Weekend | Original Production | | Hartford, Connecticut, United States | | | |
| OODiscs | Original Production | | Bridgeport, Connecticut, United States | | | |
| OODiscs Inc. | | | Bridgeport, Connecticut, United States | | | |
| Original Cast Records | Reissue Production | | Georgetown, Connecticut, United States | 1978 | | |
| Original Vision Records | | | Hartford, Connecticut, United States | | | |
| Pal-Tone Records | Original Production | | Milford, Connecticut, United States | | | |
| Palm Publishing | | | Norwalk, Connecticut, United States | | | |
| Poison Ring Records | | | Wallingford, Connecticut, United States | | | |
| PRO | Original Production | | Connecticut, United States | | [unknown] | |
| Protocol One Records | Original Production | | Rocky Hill, Connecticut, United States | 2004-01 | | |
| Quantum Wampum | | | Connecticut, United States | | | |
| Rapid Pulse Records | | | Milford, Connecticut, United States | 1997 | | |
| Rebel | | | Hartford, Connecticut, United States | | [unknown] | |
| Red Parlor | Original Production | | Norwalk, Connecticut, United States | 2005 | | |
| Redscroll Records | Original Production | | Connecticut, United States | 2000 | | |
| Rockstar Music Group | Distributor | | New London, Connecticut, United States | | | |
| Root Farmer Records | | | New London, Connecticut, United States | | | |
| Round Sky Music | Publisher | | Connecticut, United States | | | |
| Safety Meeting | | | New Haven, Connecticut, United States | 2005 | | |
| Samson Records | Original Production | | Groton , Connecticut, United States | | | |
| Sans Serif Recording | Production | | New Haven, Connecticut, United States | | | |
| Scheme Records | Production | | Connecticut, United States | | | |
| Seize Records | Original Production | | Connecticut, United States | | | |
| Sex and Glue Zine & Distro | | | Norwich, Connecticut, United States | | | |
| Smorgasbord Records | Original Production | | Milford, Connecticut, United States | 1990 | | |
| Solution Records | Original Production | | Connecticut, United States | | | |
| SoNo Recording Group | Original Production | | Norwalk, Connecticut, United States | 2012 | | |
| Squires Entertainment | Production | | Stamford, Connecticut, United States | | | |
| Stillborn Records | Original Production | | New Haven, Connecticut, United States | 1993 | | |
| Stir Music | Production | | Newtown, Connecticut, United States | 1996 | | |
| Strikeforce Records | Original Production | | Groton , Connecticut, United States | | | |
| Studio 55 | Distributor | | Glastonbury, Connecticut, United States | 2020-01-01 | | |
| Studio Mouse | Imprint | | Norwalk, Connecticut, United States | | | |
| Subtown | | | New London, Connecticut, United States | | [unknown] | |
| Superior | Imprint | | Hartford, Connecticut, United States | | | |
| Tantor Media | Imprint | | Middlesex County, Connecticut, United States | 2000 | | |
| The 1193 Music Group | Publisher | | Newtown, Connecticut, United States | 2023-07-28 | | 5 |
| The Infernal Crypt | | | Torrington, Connecticut, United States | | | |
| The Matriarch Agency | | | Darien, Connecticut, United States | 2009-01-12 | | 5 |
| The SoNo Recording Group LLC | Holding | | Norwalk, Connecticut, United States | 2012 | | |
| Threshold Records | Original Production | | Connecticut, United States | | | |
| Tinnitus Records | | | Waterbury, Connecticut, United States | 2012-05 | | |
| Veggie Co. Records | Original Production | | Connecticut, United States | 2007-12-02 | | |
| Vex | | | Connecticut, United States | | | |
| Wet Paint Music | | | Manchester, Connecticut, United States | | | |