| BLOCK ISLAND ART COMPANY LLC | Arts and entertainment | 000825665 | 2013-08-26 | Active | BLOCK ISLAND |
| BLOCK ISLAND BABYSITTERS LLC | Administrative and waste services | 001667898 | 2016-10-27 | Active | BLOCK ISLAND |
| BLOCK ISLAND BAKES LLC | — | 000130823 | 2003-03-26 | Revoked | NARRAGANSETT |
| BLOCK ISLAND BASKETS, LLC. | — | 000134330 | 2003-08-22 | Revoked | NORTH SCITUATE |
| BLOCK ISLAND BEACON, INC. | — | 000107955 | 1999-08-20 | Revoked | BLOCK ISLAND |
| BLOCK ISLAND BEERS, LLC | — | 000403560 | 2008-05-23 | Revoked | CRANFORD |
| BLOCK ISLAND BEVERAGES, INC. | — | 000653488 | 2011-04-26 | Revoked | BOSTON |
| BLOCK ISLAND BILLFISH INVITATIONAL TOURNAMENT INC | — | 001722753 | 1970-04-15 | | |
| BLOCK ISLAND BOAT BASIN, INC. | Arts and entertainment | 000002523 | 1980-05-08 | Dissolved | NORTH KINGSTOWN |
| BLOCK ISLAND BRANDS, INC. | Manufacturing | 000653462 | 2011-04-26 | Revoked | BOSTON |
| BLOCK ISLAND BREWING COMPANY LLC | — | 001690161 | 2018-11-19 | Revoked | FOXBORO |
| BLOCK ISLAND BROILER, INC. | — | 000041254 | 1986-12-26 | Revoked | |
| BLOCK ISLAND BUS COMPANY, INC. | — | 000035647 | 1985-08-27 | Revoked | |
| BLOCK ISLAND CABLE TV, INC. | — | 000002524 | 1983-02-23 | Revoked | BLOCK ISLAND |
| BLOCK ISLAND CATHOLIC LADIES GUILD, INC. | — | 000142198 | 2004-08-17 | Dissolved | BLOCK ISLAND |
| BLOCK ISLAND CHAMBER OF COMMERCE, INC. | Other services | 000148000 | 2005-05-13 | Active | BLOCK ISLAND |
| BLOCK ISLAND CLEANING SERVICES INC | Administrative and waste services | 001776881 | 2024-07-24 | Revoked | BLOCK ISLAND |
| BLOCK ISLAND CLUB | Health care and social assistance | 000048281 | 1964-08-06 | Active | BLOCK ISLAND |
| BLOCK ISLAND CONSERVANCY, INC. | Other services | 000031613 | 1972-10-06 | Revoked | BLOCK ISLAND |
| BLOCK ISLAND DIRECTORY, LLC | Information | 001335383 | 1995-09-01 | Dissolved | BLOCK ISLAND |
| BLOCK ISLAND EARLY LEARNING CENTER | Health care and social assistance | 000064319 | 1991-05-13 | Active | BLOCK ISLAND |
| BLOCK ISLAND FERRY SERVICES LLC | Transportation and warehousing | 000138505 | 2004-03-05 | Active | NEW LONDON |
| BLOCK ISLAND FIRE DEPARTMENT COMMUNITY BLOOD BANK ASSOCIATION, INC. | — | 001722770 | 1965-06-29 | | |
| BLOCK ISLAND FOOD, INC. | — | 000093811 | 1997-02-26 | Revoked | BLOCK ISLAND |
| BLOCK ISLAND GARDENERS | Other services | 000083845 | 1995-01-20 | Active | BLOCK ISLAND |
| BLOCK ISLAND GOURMET, LLC | Accommodation and food services | 000138620 | 2004-03-12 | Active | BLOCK ISLAND |
| BLOCK ISLAND HARDSCAPE, INC. | Administrative and waste services | 000745858 | 2011-12-13 | Dissolved | BLOCK ISLAND |
| BLOCK ISLAND HEALTH SERVICES, INC. | Other services | 000027470 | 1984-07-23 | Active | BLOCK ISLAND |
| BLOCK ISLAND JANITORIAL SERVICES LLC | — | 001795320 | 2025-08-29 | Revoked | NEW SHOREHAM |
| BLOCK ISLAND LAND COMPANY | — | 000002525 | 1979-06-21 | Revoked | |
| BLOCK ISLAND MARINA, INC. | Retail trade | 000002526 | 1968-05-08 | Active | BLOCK ISLAND |
| BLOCK ISLAND MARINE SCIENCE PROJECT | — | 000054014 | 1989-02-08 | Revoked | |
| BLOCK ISLAND MARTIAL ARTS LLC | Other services | 001717493 | 2021-01-09 | Active | BLOCK ISLAND |
| BLOCK ISLAND MUSIC FESTIVAL, INC. | — | 000119460 | 2001-07-16 | Revoked | BLOCK ISLAND |
| BLOCK ISLAND MUSICAL SOCIETY | — | 000027478 | 1968-06-25 | Dissolved | |
| BLOCK ISLAND NORTH LIGHT ASSOCIATION | — | 000118885 | 2001-06-11 | Active | BLOCK ISLAND |
| BLOCK ISLAND ORGANICS LLC | Wholesale trade | 000716274 | 2011-10-04 | Dissolved | SANTA MONICA |
| BLOCK ISLAND OYSTER FARM LLC | Agriculture and forestry | 000580889 | 2011-02-11 | Revoked | BLOCK ISLAND |
| BLOCK ISLAND PLUMBING AND HEATING, INC. | Construction | 001738356 | 2022-04-01 | Active | BRADFORD |
| BLOCK ISLAND PRODUCTIONS, LLC * CONVERTED TO A NON RI ENTITY* | Information | 001666002 | 2016-08-17 | Merged | PALM BEACH |
| BLOCK ISLAND RECYCLING MGT., INC. | Administrative and waste services | 000076611 | 1994-04-14 | Active | BLOCK ISLAND |
| BLOCK ISLAND REPAIR & MAINTENANCE FACILITIES & HOLDINGS, LLC | — | 000125523 | 2002-06-25 | Revoked | BLOCK ISLAND |
| BLOCK ISLAND REPAIR & MAINTENANCE, INC. | — | 000101113 | 1998-06-09 | Revoked | BLOCK ISLAND |
| BLOCK ISLAND RESERVATION, INC. | Accommodation and food services | 000096762 | 1997-09-11 | Active | BLOCK ISLAND |
| BLOCK ISLAND RESIDENTS ASSOCIATION INC.**CONSOLIDATION FILED W/ THE B.I.R.A. FOUNDATION TO FORM BLOCK ISLAND RESIDENTS' ASSOCIATION, INC. | — | 000031612 | 1954-03-08 | Merged | BLOCK ISLAND |
| BLOCK ISLAND SAILING CONSORTIUM, LLC | — | 000082905 | 1995-02-01 | Revoked | PROVIDENCE |
| BLOCK ISLAND SAILS & CANVAS, INC. | — | 000093895 | 1997-03-04 | Revoked | NEW SHOREHAM |
| BLOCK ISLAND SAILS LLC | — | 001711562 | 2020-08-16 | Revoked | NEWPORT |
| BLOCK ISLAND SALES CORPORATION | Accommodation and food services | 000057635 | 1969-12-29 | Active | EAST GREENWICH |
| BLOCK ISLAND SALT WATER CHARTERS, INC. | — | 000002530 | 1984-03-22 | Revoked | |