Here is a listing of steam traction engine manufacturers divided by county of origin.
| Company | City | Years | Comments |
| John Abell Engine & Machine Works | Toronto, ON | 1881-1902 | His company was sold, in 1902, to Advance Thresher and the Minneapolis Threshing Machine Co. , which reorganized it into the American Abell Engine & Thresher Co., Ltd. |
| American Abell Engine & Thresher Co. | Toronto, ON | 1902-1912- | In 1902 the Advance Thresher and the Minneapolis Threshing Machine Co. jointly purchased the John Abell Engine & Machine Works plant in Toronto and renamed it the American-Abell Engine and Thresher Company Limited |
| Robert Bell Engine & Thresher | Seaforth, ON | 1901-1928 | Robert Bell had built at least one portable steam engine (ca 1900's) enlisting the help of John Finlayson who was an experienced carpenter. In 1901 Robert Bell received permission to build the Port Huron Engine & Thresher Company's engines in Seaforth, ON, Canada. A 14 H.P. engine was the first to be built. |
| F. X. Bertrand Manufacturing Co. | St. Hyacinthe, QC | ca. 1916 | Canadian industry, commerce, and finance states that this firm manufactured steam traction engines. |
| John Goodison Thresher Co. Ltd. | Sarnia, ON, | 1904-1920's | AKA Tunnel City Thresher Works |
| MacDonald Thresher Co. Ltd. | New Hamburg, ON | 1890's-1917 | In 1905, arrangements were made to build the Baker steam traction engine in Canada. The Baker engine was manufactured by the A.D. Baker Company of Swanton, Ohio. |
| New Hamburg Mfg. Co. Ltd. | New Hamburg, ON | 1890's-1917 | Manufacturer of steam traction engines, portable steam engines (ca 1890's) and threshers. |
| N.C. Peterson & Sons Engine Works | Sarnia, ON | 1884-1901 | These engines were of the single cylinder, rear mount, and return flue type. |
| J.M. Ross, Sons & Co. Ltd. | St. Catharines, ON | ca. 1890's | Manufactured the Cornell steam traction engine. |
| Sawyer-Massey & Co. Ltd. | Hamilton, ON | 1904-1920's | This firm also imported Aveling & Porter steam road rollers for sale in Canada. |
| Waterloo Mfg. Co. Ltd. | Waterloo, ON | 1890's-1925 | Known as the Lion Brand. |
| Waterous Engine Works Co. | Brantford, ON | 1881-1911 | Manufactured copies of D. June & Co.'s Champion engines and Buffalo Pitts steam traction engines. |
| Geo. White & Sons Co. | London, ON | 1890's-1924 | White's engines were all simple and were built plain and sturdy, with no fancy fittings. |
| Company | City | Years | Comments |
| Adamson | Duckinfield, Cheshire, England | 1858-1859 | Manufactured Steam Traction Engines 1858-1859. |
| Allchin & Co. | Northhampton, England | 1879-1930 | Founded as the William Allchin Ltd. |
| Allen & Simmonds | Reading, Berks, England | -1909- | Manufactured Steam Traction Engines ca 1909. |
| John Allen & Co. | Cowley, Oxford, England | -1913- | Manufactured Steam Traction Engines ca 1913 |
| Appleby Brothers | Southwark, London, England | -1880's- | Later moved to East Greenwich, England |
| Archer & Hall | Gateshead-on-Tyne, England | 1880's-1890's | |
| Armitage & Rushton | Chatteris, Cambridge, England | 1879-1881 | |
| Armstrong-Whitworth | Newcastle-upon-Tyne, Durham, England | ca. 1926 | |
| Aveling & Porter | Rochester, Kent, England | 1856-1928 | In 1856 Thomas Aveling produced the first steam plough. |
| Richard Bach & Co. | Birmingham, West Midlands, England | ca. 1926 | Engine and boiler manufacturers, millwrights and general engineers |
| Barrows & Stewart | Banbury, Oxon, England | ca.1879 | Manufactured Steam Traction Engines; Steam thrashing engines; straw and hay elevators. |
| George Biddell | Ipswich, England | ca. 1863 | |
| J. W. Boulton | Ashton-Under-Lyne, England | ca. 1904 | |
| Brown & May | Devizes, Wiltshire, England | 1864-1912 | AKA North Wilts Foundry— Steam engines; thrashing machines; elevators; portable granaries. |
| Charles Burrell & Sons, Ltd. | Thetford, Norfolk, England | 1845-1930 | Manufactured Portable Steam Engines (ca 1846) and Steam Traction Engines (1856-1930) |
| Cambridge, Parham, and Webb | Bristol, Avon, England | ca. 1852 | Manufactured Steam Traction Engines; Combined vertical engines and boilers; combined double-blast thrashing machines; hay, corn, and straw elevators. |
| Carrett, Marshal & Co. | Leeds, West Yorks, England | 1861-1866 | Manufactured Steam Traction Engines. |
| Catley | Catley, York, England | 1869 | Manufactured Steam Traction Engines. |
| Alexander Chaplin and Co. | Glasgow, Scotland | 1870's | Manufactured Steam Traction Engines. |
| Chillingworth & Thurlow | London, England | 1860's | Manufactured Steam Traction Engines. |
| Clarke | Canterbury, Kent, England | unknown | Manufactured Steam Traction Engines. |
| Clayton, Shuttleworth & Co. | Lincoln, England | 1860-1930 | In 1842 Clayton, Shuttleworth and Co. was established by Joseph Shuttleworth and Nathaniel Clayton at Stamp End Works, Lincoln as an engineering business. |
| Davey Paxman & Co., Ltd. | Colchester, England | 1880's-1950's | Manufactured Steam Traction Engines. |
| Alfred Dodman & Co. | King's Lynn, England | 1872-1880's | Manufactured Steam Traction Engines. |
| Edwin Foden, Sons & Co., Ltd. | Sandbach, Cheshire, England | 1882-1925 | Manufactured Steam Traction Engines. |
| William Foster & Co Ltd. | Lincoln, England | 1889-1925 | This firm made the last Steam Traction Engines in 1942. |
| G. J. Fowell & Co | St Ives, Huntingdonshire, England | 1876-1923 | the firm became Joseph Fowell, Son & Co. in 1878, Fowells & Hunt in 1872 and Fowell & Son by 1886. |
| John Fowler & Co. | Leeds, England | 1869-1937 | In 1860 Fowler entered into an agreement with Kitson and Hewitson of Hunslet, Leeds, for them to manufacture his steam ploughs. Fowler's Steam Plough Works were built on neighbouring land at Hunslet. |
| Richard Garrett & Sons | Leiston, Suffolk England | 1876-1925 | Manufactured Steam Traction Engines. |
| Thomas Green & Son | Leeds, Yorkshire, England | 1890-1920 | Manufactured Steam Traction Engines. |
| Hammond and Hussey | Croydon, England | ca. 1875 | Manufactured Steam Traction Engines. |
| R. Hornsby & Sons', Ltd. | Grantham, England | 1850-1906 | AKA Spittlegate Iron Works. Manufactured Steam Traction Engines. |
| E. Humphries | Perahore, Worcestershire, England | ca. 1875 | Manufactured Steam Traction Engines. |
| Mann & Charlesworth | Gainsborough, England | 1894-1899 | The company was reorganized as Mann's Patent Steam Cart and Wagon Co. in 1899. |
| Marshall, Sons & Co. | Gainsborough, England | 1878-1934 | Founded in 1848, this firm merged in 1947 with John Fowler & Co. to become Marshall-Fowler Ltd. |
| J. & H. McLaren & Co. | Leeds, England | 1877-1918 | AKA Midland Engine Works. Manufactured Steam Traction Engines. |
| Ransomes, Sims & Jefferies, Ltd. | Ipswich, England | 1871-1914 | Manufactured Steam Traction Engines. |
| Robey & Co. Ltd. | Lincoln, England | 1861-1921 | Manufactured Steam Traction Engines. |
| F. Savage | King's Lynn, Norfolk, England | 1857-1912 | About 864 Traction Engines Built. |
| W. Tasker & Sons | Andover, Hampshire, England | 1858-1926 | Formerly Tasker and Fowle, in 1858, the company became Tasker and Sons. |
| E. R. & F. Turner | Ipswich, England | 1858-1926 | Founded in 1837 by Walton Turner and two partners as Bond, Turner and Hurwood , the firm manufactured its first steam engine in 1842. |
| Wallis & Steevens | Basingstoke, Hampshire, England | 1861-1923 | Founded in 1840 by Richard Wallis. In 1861 Charles Steevens joined the firm and the manufacture of steam engines was developed. |
| Wantage Engineering Co. | Wantage, England | ca. 1900-1904 | In 1900 both Robinson and Auden of Robinson & Auden Ltd. ,sold their shareholdings to Lord Wantage, who reconstructed the firm as the Wantage Engineering Co. |
| Yorkshire Patent Steam Wagon Co. | Leeds, Yorkshire, England | ca. 1901-1937 | The first wagons were produced under the name of the Yorkshire Steam Motor Company. |
| Company | City | Years | Comments |
| Advance Rumely Co. | LaPorte, IN | ca. 1853-1931 | M. & J. Rumely was founded in 1853 by brothers Meinard and John Rumely. |
| Advance Thresher Co. | Battle Creek, MI | ca. 1881-1917 | In 1902 this firm and Minneapolis Threshing Machine Co. joinly bought John Abell Engine & Machine Works and reorganized it into the American Abell Engine & Thresher Co., Ltd. |
| American Engine & Electric Co. | Bound Brook, NJ | unknown | |
| Ames Engine Works | Indianapolis, IN | unknown | |
| Ames' Iron Works | Oswego, NY | unknown | Ames' Iron Works was founded in 1854 by Henry M. Ames when he purchased Talcott & Underhill. |
| Atlas Engine Works | Indianapolis, IN | unknown | The Atlas Co. was founded in 1872 or '73 as the Indianapolis Car Works. It was reorganized twice more, once in 1874 as the Atlas Works, and again in 1878 as the Atlas Engine Works. |
| Aultman Engine & Thresher Co. | Cedar Rapids, IA | unknown | By August 1907, the Engine & Machinery Co. of Canton, OH had taken over the supplying of parts for Aultman Engines. |
| C. Aultman & Co. | Canton, OH | unknown | The C. Aultman & Co. was founded in 1851 by Cornelius Aultman. |
| Aultman-Taylor Machinery Co. | Mansfield, OH | unknown | The earliest mention we have seen of this firm is from 1874, as the Aultman-Taylor Manufacturing Co. |
| Austin Western Road Machinery Co. | Harvey, IL | unknown | |
| Avery Mfg. Co. | Peoria, IL | 1891-? | In September of 1907 The Avery Company was incorporated but fell into receivership in 1924. |
| A.D. Baker Co. | Swanton, OH | 1890-? | A.D. Baker was started by Abner D. Baker |
| Benicia-Darling | Benicia, CA | 1888-1891 | |
| Best Manufacturing Co. | San Leandro, CA | 1889-1925 | Merged in 1925 with Holt Mfg. Co. to form the Caterpiller Tractor Co. |
| Birdsall Engine Co. | | | |
| Blandy Steam Engine Works | | | |
| Blumentritt Co. | | | |
| Buffalo Pitts Co. | | | |
| Burdett & Webb | | | |
| J. I. Case & Co. | | | |
| Colean Mfg. Co. | | | |
| C. & G. Cooper & Co. | | | |
| Crowell Mfg. Co. | | | |
| Davidson & Rutledge | | | |
| Fairbanks Steam Shovel Co. | | | |
| A. B. Farquhar Co., Ltd. | | | |
| Fishkill Landing Machine Co. | | | |
| Frick Co. | | | |
| Gaar, Scott & Co. | | | |
| Geiser Manufacturing Co. | | | |
| Groton Iron Works | | | |
| Harrison Machine Works | | | |
| Heilman Machine Works | | | |
| Holt Mfg. Co. | | | |
| Huber Mfg. Co. | | | |
| Illinois Thresher Co. | | | |
| Byron Jackson Co. | | | |
| D. June & Co. | | | |
| Keck-Gonnerman Co. | | | |
| Kelly-Springfield Road Roller Co. | | | |
| Lane & Bodley | | | |
| Lang & Button Co. | | | |
| James Leffel & Co. | | | |
| McLaughlin Mfg. Co. | | | |
| Merritt & Kellogg | | | |
| Messinger Manufacturing Co. | | | |
| Minneapolis Threshing Machine Co. | | | |
| New Hamburg Mfg. Co. Ltd. | | | |
| Nichols & Shepard Co. | | | |
| Northwest Thresher Co. | | | |
| Ohio Engine and Thresher Company | | | |
| Owens, Lane & Dyer Machine Co. | | | |
| Port Huron Engine & Thresher Co. | | | |
| Jacob Price | | | |
| Reeves & Co. | | | |
| Roberts & Doan Co. | | | |
| M. Rumely Co. | | | |
| C. M. Russell & Co. | | | |
| Scheidler & McNamara | | | |
| Scheidler Machine Works | | | |
| J.O. Spencer, Son & Co. | | | |
| A. W. Stevens & Son | | | |
| Twentieth Century Mfg. Co. | | | |
| Union Iron Works (Ohio) | | | |
| Watertown Steam Engine Co. | | | |
| Westinghouse Co. | | | |
| S.W. Wood. & Son Co. | | | |
| Wood, Taber & Morse | | | |
( U. S. Table under construction)