This is not a complete list. It does not include the rod manufacturers and overseas. These are our major supplies at this point in time. Since May of 2016 it has been a roller coaster ride in the art glass industry. It really does seem that the dust has settled, and this is what we have now. Kokomo Opalescent Glass. There are in Kokomo, Indiana have been operating since 1888. They are the oldest. They use some of the same recipes that are over 128 years old. They are a great source for doing reproduction work. This is a picture of their 12-pot circular furnace. It is a down draft. It is not operational at this time. They are currently using day tank. 
The Paul Wissmach Glass Co. Located in Paden City, West Virginia. They have been operating since 1904, making them the second oldest and therefore also a great resource when trying to match old glass. They use 12 furnaces. They do art glass, temperable glass and fusible glass. They also have a full line of frit.
Youghiogheny Opalescent Glass Company, Inc. Located in Connellsville, Pennsylvania. They have been operating since 1977. Truly an art glass manufacturer but has also a wonderful line of fusing glass. Amazing color artistry. They have recently added a textures, true dichro, and are now Manufactuing Uroboros which they call Uro by Yough.
Bullseye Glass Co. Located in Portland Oregon since 1974. They focus on fusible glass, collaborating with artist and teaching. They produce extremely rich colors. 
Oceanside Glass & Tile. Started in 1992. They are located in Vista, California, but production is in Tijuana, Mexico. Their focus was glass tiles. They had been buying their glass from Spectrum. They bought both the Spectrum Glass and Uroboros Glass lines in 2016 when both companies announced they were closing. They later sold the Uroboros line to Youghiogheny.
Some glass, mostly clears come from Pilkington, Saint Gobain and GNA.
