| Block Island Cookie Company, LLC | Accommodation and food services | 001683452 | 2018-05-04 | Revoked | BLOCK ISLAND |
| Block Island Craft LLC | Wholesale trade | 001706177 | 2020-03-19 | Active | BLOCK ISLAND |
| Block Island Economic Development Foundation Housing Corporation | Other services | 000060769 | 1984-06-29 | Active | BLOCK ISLAND |
| Block Island Ecumenical Ministries, Inc. | Other services | 000028637 | 1983-01-10 | Active | BLOCK ISLAND |
| Block Island Energy Technologies LLC | — | 000143419 | 2004-10-12 | Revoked | BLOCK ISLAND |
| Block Island Enterprises, LLC | Real estate and leasing | 001669391 | 2016-12-22 | Active | NORTH PROVIDENCE |
| Block Island Equipment Rental LLC | — | 001803715 | 2026-02-06 | Active | BLOCK ISLAND |
| Block Island Essentials, LLC | — | 001727768 | 2021-08-06 | Revoked | NORTH HAVEN |
| Block Island Events LLC. | — | 000791734 | 2012-07-16 | Revoked | BLOCK ISLAND |
| Block Island Family Limited Partnership | — | 000152199 | 2005-12-05 | Revoked | SCARSDALE |
| Block Island Farmers Market | Other services | 000799652 | 2013-06-10 | Active | BLOCK ISLAND |
| Block Island Farming, L.L.C. | Retail trade | 001697741 | 2019-07-08 | Active | BLOCK ISLAND |
| Block Island Film Festival | — | 001689281 | 2018-10-18 | | |
| Block Island Film Festival | Information | 001689287 | 2018-10-19 | Active | BLOCK ISLAND |
| Block Island Fishermans Cooperative, Inc. | — | 000033323 | 1985-02-15 | Revoked | |
| Block Island Fishing Charters, LLC | — | 000163197 | 2007-04-13 | Revoked | BLOCK ISLAND |
| Block Island Fishing Tackle, LLC | — | 000293613 | 2007-12-21 | Revoked | BLOCK ISLAND |
| Block Island Fishing, Inc. | Agriculture and forestry | 000486788 | 2008-10-21 | Active | NEW BEDFORD |
| Block Island Fishworks LLC | — | 000535763 | 2010-04-08 | Active | BLOCK ISLAND |
| Block Island Fitness Center, Inc. | — | 000118190 | 2001-05-02 | Revoked | BLOCK ISLAND |
| Block Island Fresh Catch Company | Agriculture and forestry | 001790160 | 2025-05-09 | Active | BLOCK ISLAND |
| Block Island Furniture Company | — | 001716362 | 2020-12-17 | Revoked | |
| Block Island Global, LLC | — | 000917434 | 2014-04-09 | Revoked | WESTERLY |
| Block Island Guided Bike Tours LLC | Manufacturing | 001757273 | 2023-05-10 | Active | BLOCK ISLAND |
| Block Island Harbor Cruises, Inc. | — | 000073411 | 1993-07-19 | Dissolved | BLOCK ISLAND |
| Block Island Harbor, LLC | Real estate and leasing | 001719226 | 2021-02-11 | Active | WESTERLY |
| Block Island Heat Pump LLC | Construction | 001742081 | 2022-06-15 | Active | BLOCK ISLAND |
| Block Island Holdings, L.L.C. | — | 000098332 | 1997-12-31 | Revoked | BLOCK ISLAND |
| Block Island Holidays, Inc. | — | 000083109 | 1995-02-17 | Revoked | ELLINGTON |
| Block Island Home management LLC | Construction | 001760352 | 2023-07-17 | Active | BLOCK ISLAND |
| Block Island Housing Initiative | Health care and social assistance | 001738170 | 2022-03-29 | Active | BLOCK ISLAND |
| Block Island Housing, Inc. | — | 000132563 | 2003-06-06 | Revoked | PROVIDENCE |
| Block Island Internet Services, Inc. | — | 000087627 | 1996-01-05 | Revoked | WESTERLY |
| Block Island Landscape Design, LLC | Construction | 001681011 | 2018-01-31 | Active | NEW SHOREHAM |
| Block Island Lawn & Garden LLC | Administrative and waste services | 001673357 | 2017-05-01 | Active | BLOCK ISLAND |
| Block Island Lawn Maintenance, Inc | Administrative and waste services | 000104055 | 1998-12-28 | Active | BLOCK ISLAND |
| Block Island Lobster Co., Inc. | Manufacturing | 000063407 | 1991-02-19 | Dissolved | ESSEX |
| Block Island Maritime Institute | Other services | 000098593 | 1998-01-07 | Active | BLOCK ISLAND |
| Block Island Marketplace LLC | — | 001708098 | 2020-05-24 | Revoked | NEW SHOREHAM |
| Block Island Mortgage LLC | — | 001810443 | 2026-06-01 | Active | |
| Block Island Ocean View Associates Limited Partnership | — | 000050042 | 1987-05-12 | Revoked | PROVIDENCE |
| Block Island Out | — | 001741615 | 2022-06-08 | Revoked | |
| Block Island Outfitters, Inc. | — | 000152520 | 2005-12-30 | Revoked | NEW SHOREHAM |
| Block Island Oyster Company LLC | — | 001661224 | 2016-03-10 | Revoked | BLOCK ISLAND |
| Block Island Parasail, Inc. | Arts and entertainment | 000055563 | 1989-04-24 | Active | BLOCK ISLAND |
| Block Island Partners, LLC | — | 000158913 | 2006-09-28 | Revoked | NORTH PROVIDENCE |
| Block Island Pharmacy, Ltd. | Retail trade | 000038634 | 1986-05-09 | Revoked | BLOCK ISLAND |
| Block Island Photo Booth, LLC | Professional services | 001696018 | 2019-05-13 | Revoked | NEW SHOREHAM |
| Block Island Pizza Pie Company, LLC | — | 001673321 | 2017-05-01 | Active | SOUTH KINGSTOWN |
| Block Island Plumbing & Heating, Inc. | Construction | 000020631 | 1978-07-05 | Dissolved | BLOCK ISLAND |