- 1st Glass Block
 - Offers a variety of glass blocks and glass block windows to homeowners and builders at discount prices. - Columbus Glass Block
- Offers glass block windows, showers, and walls for basements, bathrooms, and commercial projects.
- Eastern Glass Block
- Distributors, prefabricators, and architectural installers of Pittsburgh Corning glass blocks.
- Ecocera
- Manufacturer of cellular glass and environment friendly ceramics.
- GBI Glass Block
- Supplies glass block and accessories to installers and the public at wholesale prices.
- Glashaus Inc. (4)
- Glass Block Designs
- Selling standard and decorative glass block.
- Glass Block Products
- Distributor and retailer of WECK glass blocks, pre-built glass block windows, and supplies and accessories. Installations for commercial and residential projects.
- Glass Block Source
- Designer glass block for home and commmercial applications.
- Glass Masonry, Inc.
- Distributes different sizes, designs and colours of glass blocks and all installation accessories.
- Hy-Lite Block Windows
- An alternative to glass block, prefabricated windows of lightweight acrylic blocks.
- Maryland Glass Block, Inc.
- Distributor, fabricator, and installer of glass block windows and walls.
- Pacific Accent
- Manufactures prefabricated all-metal, wood and wood-clad glass block windows and panels.
- Pittsburgh Corning Corporation
- Manufactures glass block and Foamglass cellular glass insulation.
- Seves Glassblock
- Manufacturer of glass blocks for architectural and interior design applications including various designs, colours, and finishes for interior and exterior walls, windows, floors, and facades.
- T.C.C. Ningbo Glass Products Co. Ltd
- Manufacturer of float glass, glass blocks, float silver mirrors, and other glass products.
- Vetromattone
- Sells glass blocks in many colours and patterns with worldwide delivery.
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