5 INCH POLAREX/UNITRON Telescopes:
- John Graham (Owner), Ohio, USA (Unitron Model 510)
- Athens College, Greece (Polarex Model 136F)
- Tore Engen (Owner), Oslo, Norway (Polarex Model 136F)
- Will Thornton (Owner), Virginia, USA (Unitron Model 530)
- Frank Tomaras (Owner), Montreal, Canada (Unitron Model 530)
- Tiendesprong Observatory, Netherlands (Polarex Model 136F)
- Slottskogen Observatory, Gothenburg, Sweden (Meridian/Polarex, Model 136F)
- Ohlsson Observatory, Alingsas, Sweden (Polarex Model 136F)
- Harrie G.J. Rutten, The Netherlands (Polarex Model 136E)
- DAX Observatory, France (Unitron Model 530)
- University of Central Arkansas, Conway, Arkansas, USA (Unitron Model 530)
6 INCH POLAREX/UNITRONS:
- Rafes Urban Astronomy Center (RUAC) Observatory, Texas, USA (Model 620)
- Castleton State University, Castleton, Vermont, USA (Model 620)
- Ferris State University, Big Rapids, Michigan, USA (Model 620)
- University of Connecticut Physics Observatory, Connecticut, USA (Dual OTAs)
- University of Western Toronto, Toronto, Canada (Model 620)
- Indiana State University, Indiana, USA (Model 620)
- Astronomical Telescope Museum, Shikoku Island, Japan (Polarex Model 135)
- McDonald Observatory, Finderscope for 2.7M Harlan J. Smith Telescope (6″ Unitron)
- (T) Olivet College, Olivet, Michigan, USA (Model 620)
- (P) Athens, Greece (6″ Polarex)
- (T) Ball State University, Indiana, USA (6″ Unitron): 1967-early 1990s
- (P) Villanova University, Pennsylvania, USA (6″ Unitron): 1960s Photo
Delft University, Netherlands: Polarex-Unitron Model 900: 
Note 1: (P) refers to possible or past location, current status needs to be confirmed; (T) refers to sold or otherwise disposed
Note 2: Research has confirmed another four 5″ and two 6″, but in the interest of privacy, names and locations will remain private.
Note 3: Additionally, inputs from multiple reliable private sources indicates the total number of 6″ Polarex/Unitron models/OTAs could be as high as twenty-seven
Note 4: Information provided by Alex Boot indicates the existence of five 8″ Polarex/Unitron telescopes.