| DURHAM'S 1000739 · TMA537700 | RH Brands, Inc. | 1 Chemicals10 Medical17 Rubber+1 | Registered | 2000 |
| DURHAM'S 1000738 · TMA537660 · design | RH Brands, Inc. | 1 Chemicals10 Medical17 Rubber+1 | Registered | 2000 |
| DURHAM D 0900978 · design | Owner not shown | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 1978 |
| DYE & DURHAM 1820919 · TMA1018651 | DYE & DURHAM CORPORATION | 9 Electronics16 Paper35 Advertising+7 | Registered | 2019 |
| DYE & DURHAM 1805238 · TMA1004287 · design | DYE & DURHAM CORPORATION | 9 Electronics35 Advertising36 Finance+2 | Registered | 2018 |
| DYE & DURHAM 1805237 · TMA1004278 | DYE & DURHAM CORPORATION | 9 Electronics | Registered | 2018 |
| DURHAM EMS 0911904 | Owner not shown | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2000 |
| DURHAM LIVE!! 1831352 | Pickering Developments (Bayly) Inc. | 25 Clothing35 Advertising36 Finance+4 | Pending | 2017 |
| DURHAM LIVE!! 1829435 | Pickering Developments (Bayly) Inc. | 25 Clothing35 Advertising36 Finance+3 | Pending | 2017 |
| DURHAM STONE 1537426 · TMA872507 | Oldcastle Building Products Canada, Inc./Les Matériaux de Construction Oldcastle Canada, Inc. | 19 Building | Registered | 2014 |
| DURHAM DLIVE 1902555 · design | Pickering Developments (Bayly) Inc. | 25 Clothing35 Advertising36 Finance+5 | Pending | 2018 |
| DURHAM DLIVE 1902554 | Pickering Developments (Bayly) Inc. | 25 Clothing35 Advertising36 Finance+5 | Pending | 2018 |
| PIERRE DURHAM 1537425 · TMA872496 | Oldcastle Building Products Canada, Inc./Les Matériaux de Construction Oldcastle Canada, Inc. | 19 Building | Registered | 2014 |
| DURHAM MEDICAL 1536282 · TMA857787 · design | Durham Medical 1983 Ltd. | 35 Advertising37 Construction39 Transport+4 | Registered | 2013 |
| DURHAM MEDICAL 1536281 · TMA857789 | Durham Medical 1983 Ltd. | 35 Advertising37 Construction39 Transport+4 | Registered | 2013 |
| DURHAM COLLEGE 0914883 | THE DURHAM COLLEGE OF APPLIED ARTS AND TECHNOLOGY | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2003 |
| DURHAM COLLEGE 0914881 · design | THE DURHAM COLLEGE OF APPLIED ARTS AND TECHNOLOGY | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2003 |
| Do It In Durham 1878230 · TMA1077929 | Business Advisory Centre Durham Inc. | 16 Paper35 Advertising | Registered | 2020 |
| D DURHAM REGION 0912749 · design | Owner not shown | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2000 |
| DURHAM CRUSADERS 1436215 · TMA790747 | CYO Hockey (Ontario Corporation No. 677669) | 9 Electronics14 Jewellery16 Paper+6 | Registered | 2011 |
| DURHAM FURNITURE 0769342 · TMA453925 · design | DURHAM FURNITURE INC. | 20 Furniture | Registered | 1996 |
| DURHAM FIRST AID 2365737 · design | Owner not listed | 41 Education | Pending | 2024 |
| DURHAM REGION EMS 0911906 · design | Owner not shown | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2000 |
| DURHAM REGION EMS 0911903 | Owner not shown | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2000 |
| F C DURHAM ACADEMY 1901758 · TMA1122744 | F C DURHAM ACADEMY INC. | 25 Clothing28 Toys41 Education | Registered | 2022 |