| Owner | Region | Town | Name of Facility | Relationhsip | Year | Status |
| John (father), Anne (mother), Simon and David | Halton | Acton | Acton Mill | built | 1851 | confirmed |
| Simon Plewes | Chinguacousy | Salmonville (Terra Cotta) | Plewes Mill | built | 1857? | confirmed |
| David Plewes | Chinguacousy | Salmonville (Terra Cotta) | Plewes Mill | purchases | 1885 | confirmed |
| James Cleaver & David Plewes | Halton | Lowville | Cleaver Mill | son-in-law | c1853 | confirmed |
| David Plewes | Brant County | Brantford | Kerby Mill | purchased | c1868 | confirmed |
| David Plewes | Brant County | Brantford | Holmedale Mill | purchased | c1871 | confirmed |
| William Plewes | Middlesex | London | Meadowlily Mill | | | confirmed |
| David Plewes & Isaac Warcup | Nassagaweya | Corner Limestone Rd & Canyon Rd. | Abbeys Grist Mill | | 1877 | speculative |
| William Warcup & David Plewes | Halton | Oakville | Chisholm Mill | partnership | 1870 | speculative |
| James Plewes | Welland | Thorold | Overholt Mill, St. Johns Village? | | 1851 | investigating |
| James Plewes | | Markdale | | | | confirmed |
| James Plewes | | Kimberley | | | | confirmed |
| James Plewes | | Dunnedin | | | | confirmed |
| William and Simon Plewes | Nassagaweya | Everton | Rufus Everts Mill | leased for 1 year in exchange for mechnical refitting | 1851 | confimed |
| David Plewes & Isaac Warcup | | Milton | | | | investigating |
| David Plewes & Isaac Warcup | | Campbellville | | | | investigating |
| | Udora | Peers Mill | Plewes and Peers were partners in several ventures | 1885 | investigating |
| Snider / Plewes? | | St Jacobs | | Plewes and Snider were retail and shipping shipping partners in Hamilton at the corner of Market and Park (now Copps Coliseum). | | investigating |
