| Rank | 1st model | Manufacturer | # models |
 USA (18 mfg.) |
| 1 |
1939 | Bell Telephone Laboratories | 9 |
| 2 |
1938 | Arma Corp. | 6 |
| 3 |
1943 | Sperry Rand Corp. | 5 |
| 4 |
1948 | Reeves Instrument Corp. (RICO) | 2 |
| 5 |
1944 | Harvard University | 2 |
| 6 |
1949 | International Business Machine Corp. (IBM) | 2 |
| 7 |
1947 | Engineering Research Associates (ERA) (div. Remington-Rand) | 2 |
| 8 |
1949 | Barber Colman Co. | 1 |
| 9 |
1949 | Goodyear Aircraft Corp. | 1 |
| 10 |
1949 | Consolidated Engineering Corp. (CEC) | 1 |
| 11 |
1949 | Eckert–Mauchly Computer Corp. (EMCC) | 1 |
| 12 |
1939 | The Norden Laboratories Corp. | 1 |
| 13 |
1949 | Boeing Airplane Co. | 1 |
| 14 |
1947 | University of Pennsylvania - Moore School | 1 |
| 15 |
1939 | J.V. Atanasoff/C. Berry | 1 |
| 16 |
1947 | Northrop Aircraft Corp. - Nortronics Division | 1 |
| 17 |
1938 | George A. Philbrick Researches, Inc. (GAP/R) | 1 |
| 18 |
1948 | Westinghouse Electric Corp. | 1 |
 UK (7 mfg.) |
| 1 |
1948 | Victoria University of Manchester | 3 |
| 2 |
1943 | Government Code and Cypher School (GC&CS) | 2 |
| 3 |
1949 | University of Cambridge Mathematical Laboratory | 1 |
| 4 |
1943 | Post Office Research Station | 1 |
| 5 |
1947 | University of London - Birkbeck College | 1 |
| 6 |
1950 | A. D. Booth | 1 |
| 7 |
1939 | Aron Electricity Meter Co. | 1 |
 GER (3 mfg.) |
| 1 |
1938 | Zuse K.G. | 3 |
| 2 |
1941 | H. Hoelzer | 1 |
| 3 |
1941 | VEB Carl Zeiss | 1 |
 RUS (3 mfg.) |
| 1 |
1948 | +unknown (RUS) | 3 |
| 2 |
1948 | Institute of Energy of the Academy of Science | 1 |
| 3 |
1941 | V. S. Lukyanov | 1 |
 AUS (2 mfg.) |
| 1 |
1949 | Commonwealth Scientific and Industrial Rersearch Organisation (CSIRO) | 1 |
| 2 |
1949 | University of Melbourne | 1 |
 FRA (1 mfg.) |
| 1 |
1949 | Société d'Electronique et d'Automatisme (SEA) | 1 |
