| 4,701 | numaracle.ca | — | brandable | 1/11 |
| 4,702 | numaticengineering.ca | — | niche | 1/11 |
| 4,703 | nutrichi.ca | — | brandable | 1/11 |
| 4,704 | nutritionanalytics.ca | Healthcare / medical / mental health | keyword | 1/11 |
| 4,705 | nxtprint.ca | Retail / e-commerce / shop | brandable | 1/11 |
| 4,706 | nyffdesign.ca | Entertainment / media / arts | keyword | 1/11 |
| 4,707 | oakbaysolar.ca | Environment / energy / sustainability | geo | 1/11 |
| 4,708 | oatkitchen.ca | Food / restaurant / beverage | keyword | 1/11 |
| 4,709 | ockertgreeff.ca | — | brandable | 1/11 |
| 4,710 | octobayoga.ca | Fitness / sports / outdoor | keyword | 1/11 |
| 4,711 | ofelitecreatornetwork.ca | — | | 1/11 |
| 4,712 | offcook.ca | Food / restaurant / beverage | keyword | 1/11 |
| 4,713 | offerlii.ca | Retail / e-commerce / shop | keyword | 1/11 |
| 4,714 | offgridsolarpower.ca | Environment / energy / sustainability | keyword | 1/11 |
| 4,715 | officevancouver.ca | General services (cleaning, plumbing, contractors) | geo | 1/11 |
| 4,716 | offroadrage.ca | Automotive | keyword | 1/11 |
| 4,717 | ogjointventures.ca | — | keyword | 1/11 |
| 4,718 | ohdannyboy.ca | Entertainment / media / arts | niche | 1/11 |
| 4,719 | ohinternational.ca | — | keyword | 1/11 |
| 4,720 | ohmybuzz.ca | Entertainment / media / arts | brandable | 1/11 |
| 4,721 | okagrow.ca | Agriculture / farming / cannabis | keyword | 1/11 |
| 4,722 | okprotest.ca | Government / civic / political | niche | 1/11 |
| 4,723 | oktrades.ca | — | brandable | 1/11 |
| 4,724 | olgalifecoach.ca | Education / training / coaching | keyword | 1/11 |
| 4,725 | olheiser.ca | — | | 1/11 |
| 4,726 | omgco.ca | — | premium | 1/11 |
| 4,727 | omnimca.ca | Finance / banking / insurance | niche | 1/11 |
| 4,728 | onclebill.ca | — | keyword | 1/11 |
| 4,729 | ondeckmarine.ca | General services (cleaning, plumbing, contractors) | keyword | 1/11 |
| 4,730 | ondemandlawncare.ca | General services (cleaning, plumbing, contractors) | keyword | 1/11 |
| 4,731 | one60elgin.ca | — | | 1/11 |
| 4,732 | one8cafe.ca | Food / restaurant / beverage | keyword | 1/11 |
| 4,733 | onebbq.ca | Food / restaurant / beverage | keyword | 1/11 |
| 4,734 | oneearthblog.ca | — | keyword | 1/11 |
| 4,735 | onestopsantashop.ca | Retail / e-commerce / shop | keyword | 1/11 |
| 4,736 | onlineguardtraining.ca | Fitness / sports / outdoor | keyword | 1/11 |
| 4,737 | onrecords.ca | — | word | 1/11 |
| 4,738 | ontariocricketassociation.ca | Fitness / sports / outdoor | niche | 1/11 |
| 4,739 | ontariopsychologists.ca | Healthcare / medical / mental health | keyword | 1/11 |
| 4,740 | ontariostudenthousing.ca | — | | 1/11 |
| 4,741 | ontariovineyards.ca | Food / restaurant / beverage | geo | 1/11 |
| 4,742 | ontvape.ca | — | niche | 1/11 |
| 4,743 | openmindsonly.ca | — | keyword | 1/11 |
| 4,744 | opportunitiesnorth.ca | Jobs / careers / HR | keyword | 1/11 |
| 4,745 | oprintz.ca | — | brandable | 1/11 |
| 4,746 | oratii.ca | — | brandable | 1/11 |
| 4,747 | orcdsb.ca | — | | 1/11 |
| 4,748 | orchardcroft.ca | Agriculture / farming / cannabis | keyword | 1/11 |
| 4,749 | orchardgo.ca | Agriculture / farming / cannabis | keyword | 1/11 |
| 4,750 | orionchineserestaurant.ca | Food / restaurant / beverage | geo | 1/11 |