| Nar-Anon Family Groups of Ontario, Barrie - No Physical Address | Barrie |
| Nar-Anon Family Groups of Ontario, Innisfil - Virtual | Innisfil |
| Nar-Anon Family Groups of Ontario, Innisfil | Innisfil |
| Nar-Anon Family Groups of Ontario, Owen Sound | Owen Sound |
| Narcotics Anonymous, Central Lake Ontario Area | Oshawa |
| Narcotics Anonymous, Georgian Heartland Area | Clearview (Simcoe County) |
| National Association of Federal Retirees, Barrie, National Association of Federal Retirees - Huronia Branch 35 | Barrie |
| National Council of Jewish Women of Canada - Simcoe County, Mailing Address | Innisfil |
| National Eating Disorder Information Centre | Toronto Downtown Central |
| National Student Loans Service Centre | Mississauga |
| Naturally You Mastectomy and Bra Boutique, Barrie | Barrie |
| Nature Barrie | Barrie |
| Nature League, Collingwood - Mailing Address | Collingwood |
| NBC Hockey | St Marys |
| Near North Palliative Care Network, Almaguin Palliative Care Team | Sundridge |
| Neuroclinic Barrie | Barrie |
| Neustadt Happy Adventurers | Neustadt |
| New Beginnings Support Group, Online/Web Service | Toronto |
| New Canadians Centre, Cobourg - William St, Northumberland Branch | Cobourg |
| New Canadians Centre, Online / Web Service, Welcome Peterborough | Peterborough |
| New Canadians Centre, Peterborough Branch | Peterborough |
| New Canadians Centre, Peterborough Branch, Peterborough Immigration Partnership | Peterborough |
| New Canadians Centre, Peterborough Branch, Resettlement Assistance Program | Peterborough |
| New Dawn Medical, Cobourg, Methadone Clinic | Cobourg |
| New Democratic Party of Canada, Barrie-Innisfil Federal Electoral District Association | Barrie |
| New Democratic Party of Canada, Barrie-Springwater-Oro-Medonte Federal Electoral District Association | Barrie |
| New Democratic Party of Ontario, No Physical Address, Barrie-Innisfil Provincial Electoral District Association | Barrie |
| New Democratic Party of Ontario, No Physical Address, Barrie-Springwater-Oro Medonte Provincial Electoral District Association | Barrie |
| New Farm Centre, Organic Food | Clearview (Simcoe County) |
| New Horizons Rehabilitation Services Inc., New Horizons Rehabilitation Services | North Perth |
| New Life Church, Collingwood | Collingwood |
| New Life Church, Collingwood, You in Mind Support Groups | Collingwood |
| New Life Clinic, Barrie, Virtual Methadone / Suboxone Addiction Clinic | Barrie |
| New Life Fellowship Baptist Church | Innisfil |
| New Path Youth and Family Services of Simcoe County, Alliston Office, Quick Access Counselling Clinic | New Tecumseth |
| New Path Youth and Family Services of Simcoe County, Alliston Office, Youth and Family Counselling Services | New Tecumseth |
| New Path Youth and Family Services of Simcoe County, Barrie - Lakeshore Dr, Attendance Centre | Barrie |
| New Path Youth and Family Services of Simcoe County, Barrie - Lakeshore Dr, Quick Access Counselling Clinic | Barrie |
| New Path Youth and Family Services of Simcoe County, Barrie - Lakeshore Dr, Youth and Family Counselling Services | Barrie |
| New Path Youth and Family Services of Simcoe County, Barrie Head Office, Adolescent Outreach Program | Barrie |
| New Path Youth and Family Services of Simcoe County, Barrie Head Office, Early Years Services | Barrie |
| New Path Youth and Family Services of Simcoe County, Barrie Head Office | Barrie |
| New Path Youth and Family Services of Simcoe County, Barrie Head Office, Parenting Support Programs | Barrie |
| New Path Youth and Family Services of Simcoe County, Barrie Head Office, Quick Access Counselling Clinic | Barrie |
| New Path Youth and Family Services of Simcoe County, Barrie Head Office, Youth and Family Counselling Services | Barrie |
| New Path Youth and Family Services of Simcoe County, Bradford Office, Quick Access Counselling Clinic | Bradford West Gwillimbury |
| New Path Youth and Family Services of Simcoe County, Bradford Office, Youth and Family Counselling Services | Bradford West Gwillimbury |
| New Path Youth and Family Services of Simcoe County, Collingwood Office, Quick Access Counselling Clinic | Collingwood |
| New Path Youth and Family Services of Simcoe County, Collingwood Office, Youth and Family Counselling Services | Collingwood |
| New Path Youth and Family Services of Simcoe County, Cookstown Office, Live in Treatment Services | Innisfil |
| New Path Youth and Family Services of Simcoe County, Midland Office, Quick Access Counselling Clinic | Midland |
| New Path Youth and Family Services of Simcoe County, Online / Web Service, Expand the Reach | Barrie |
| New Path Youth and Family Services of Simcoe County, Orillia Office, Quick Access Counselling Clinic | Orillia |
| New Path Youth and Family Services of Simcoe County, Orillia Office, Youth and Family Counselling Services | Orillia |
| New Tecumseth Public Library, Alliston, Memorial Branch | New Tecumseth |
| New Tecumseth Public Library, Beeton, DA Jones Branch | New Tecumseth |
| New Tecumseth Public Library, Tottenham, Pam Kirkpatrick Branch | New Tecumseth |
| New Tecumseth. Fire Department | New Tecumseth |
| New Tecumseth. Municipal Office | New Tecumseth |
| New Tecumseth. Municipal Office, No physical address, Rest Stations for Extreme Weather Relief | New Tecumseth |
| NEXIM Health Care Consultants, Barrie Office | Barrie |
| Next Gen Men | Simcoe |
| Next Gen Men | Simcoe |
| Next Gen Men, NGM Boys+ Club | Simcoe |
| NEXT STEP, Literacy and Basic Skills | New Tecumseth |
| NEXT STEP | New Tecumseth |
| Nigerian Community in Barrie - Canada, Barrie | Barrie |
| Nightingale Nursing Registry, Cobourg, In-Home Health Care, Cobourg | Cobourg |
| Nightingale Nursing Registry, Nightingale Home Maintenance, Peterborough | Selwyn Township |
| Nightingale Nursing Registry, Peterborough, In-Home Health Care, Peterborough | Selwyn Township |
| Niijkiwendidaa Anishnaabekwewag Services Circle | Peterborough |
| Nikaanaganaa Counselling & Learning Centre | Owen Sound |
| Nipissing Parry Sound Student Transportation Services | North Bay |
| Noah's Ark & The Community Table, Exeter Pentecostal Tabernacle, Noah's Ark Thrift Store & The Community Table | South Huron |
| Noah's Ark & The Community Table, Exeter Pentecostal Tabernacle, South Huron Connection Centre | South Huron |
| Nogojiwanong Friendship Centre, Mental Health and Well-Being Program, Peterborough - 159 King St | Peterborough |
| Nogojiwanong Friendship Centre | Peterborough |
| Nogojiwanong Friendship Centre, Addictions and Mental Health | Peterborough |
| Nogojiwanong Friendship Centre, Akwe:go Urban Aboriginal Children's Program | Peterborough |
| Nogojiwanong Friendship Centre, Apatisiwin Employment Training Program | Peterborough |
| Nogojiwanong Friendship Centre, Court Worker Program | Peterborough |
| Nogojiwanong Friendship Centre, Cultural Resource Program | Peterborough |
| Nogojiwanong Friendship Centre, Early Years Program | Peterborough |
| Nogojiwanong Friendship Centre, Gender Diverse Indigenous Mentor Program | Peterborough |
| Nogojiwanong Friendship Centre, Healthy Living and Healthy Kids Programs | Peterborough |
| Nogojiwanong Friendship Centre, Indigenous Community Wellness | Peterborough |
| Nogojiwanong Friendship Centre, Indigenous Family Support | Peterborough |
| Nogojiwanong Friendship Centre, Indigenous Languages Revitalization Program (ILRP) | Peterborough |
| Nogojiwanong Friendship Centre, Kizhaay Anishinaabe Niin | Peterborough |
| Nogojiwanong Friendship Centre, Life Long Care Program | Peterborough |
| Nogojiwanong Friendship Centre, Prenatal Nutrition Program | Peterborough |
| Nogojiwanong Friendship Centre, Reaching Home | Peterborough |
| Nogojiwanong Friendship Centre, Urban Indigenous Homeward Bound Program | Peterborough |
| Nogojiwanong Friendship Centre, Wasa-Nabin | Peterborough |
| Noor-Ul-Islam of Ontario, Barrie, Barrie Mosque | Barrie |
| Norland Area Senior Citizens Club | Kawartha Lakes |
| Norland Horticultural Society | Norland |
| North Bay Parry Sound District Health Unit, Burk's Falls Office, North Bay Parry Sound District Health Unit, Private Drinking Water Testing | Burk's Falls |
| North Bay Parry Sound District Health Unit, Parry Sound Office, North Bay Parry Sound District Health Unit, Parry Sound Office | Parry Sound |
| North East Grey Health Clinics | Meaford |
| North Huron Community Food Share, Food Bank | North Huron |
| North Huron Soccer and AOS Field Hockey Club, Goderich Women's Soccer / AOS Field Hockey Club | Goderich |
| North Huron Trail Grooming, Clinton, Snowmobile Club | Central Huron |
| North Huron. Municipal Office, Belgrave, Belgrave Community Centre | North Huron |
| North Huron. Municipal Office, Blyth, Blyth & District Community Centre & Arena | North Huron |
| North Huron. Municipal Office, North Huron Children's Centre | North Huron |
| North Huron. Municipal Office, North Huron Fire Department, Fire Department | North Huron |
| North Huron. Municipal Office, Wescast Community Complex | North Huron |
| North Huron. Municipal Office, Wingham | North Huron |
| North Kawartha Food Bank | |
| North Kawartha. Municipal Office, Apsley - 175 Burleigh St, North Kawartha Public Library | North Kawartha |
| North Kawartha. Municipal Office, Apsley - Fire Headquarters, Fire and Rescue Services, Apsley - Fire Headquarters | North Kawartha |
| North Kawartha. Municipal Office | Apsley |
| North Kawartha. Municipal Office, Woodview - Fire Station 1, Fire and Rescue Services, Woodview - Fire Station 1 | North Kawartha |
| North Lambton Childcare Centre, Grand Bend | Lambton Shores |
| North Muskoka Nurse Practitioner-Led Clinic | Huntsville |
| North Perth Arts & Culture Council, Mailing Address | North Perth |
| North Perth Community Hospice | North Perth |
| North Perth Seniors | North Perth |
| North Perth Sports for Kids Fund, Mailing Address | North Perth |
| North Perth Trails | North Perth |
| North Perth. Municipal Office, EarlyON - Various Sites, North Perth EarlyON | North Perth |
| North Perth. Municipal Office, Elma Logan Recreation Complex | North Perth |
| North Perth. Municipal Office, Elma Memorial Community Centre | North Perth |
| North Perth. Municipal Office, Hockey Rec League, Steve Kerr Memorial Complex | North Perth |
| North Perth. Municipal Office, Monkton Child Care Centre, Childcare | North Perth |
| North Perth. Municipal Office, North Perth Fire Department | North Perth |
| North Perth. Municipal Office, North Perth Public Library - Atwood Branch, North Perth Public Library - branches | North Perth |
| North Perth. Municipal Office, North Perth Public Library - Listowel Branch | North Perth |
| North Perth. Municipal Office, North Perth Public Library - Monkton Branch, North Perth Public Library - branches | North Perth |
| North Perth. Municipal Office, North Perth, North Perth Community of Character | North Perth |
| North Perth. Municipal Office | North Perth |
| North Perth. Municipal Office, SET7 Skills and Technology North Perth and Region | North Perth |
| North Perth. Municipal Office, School Age Childcare and Programs, Spinrite Child and Family Centre - 955 Binning St W | North Perth |
| North Perth. Municipal Office, St Mary's Child Care Centre, Childcare | North Perth |
| North Perth. Municipal Office, St Mary's Child Care Centre, Women's Recreational Volleyball | North Perth |
| North Perth. Municipal Office, Steve Kerr Memorial Complex | North Perth |
| North Perth. Municipal Office, Wallace Community Centre and Arena, Wallace Community Centre | North Perth |
| North Perth. Municipal Office, Westfield Elementary School, Spinrite Child and Family Centre - Child Care, Spinrite Child and Family Centre - 955 Binning St W | North Perth |
| North Perth. Municipal Office, Women's Recreational Volleyball | Listowel |
| North Simcoe Community Futures Development Corporation | Midland |
| North Simcoe Family Health Team (NSFHT), Diabetes Education Program, Prospect Blvd - Unit 3 | Midland |
| North Simcoe Family Health Team (NSFHT), Prospect Blvd - Unit 2, Cold and Flu Clinic | Midland |
| North Simcoe Family Health Team (NSFHT), Prospect Blvd - Unit 2, Seniors Care Program | Midland |
| North Simcoe Family Health Team (NSFHT), Prospect Blvd - Unit 3, Local Health Services | Midland |
| North Simcoe Family Health Team (NSFHT), Prospect Blvd - Unit 3, Same Day/Next Day Access Clinic | Midland |
| North Simcoe Life | Orillia and area |
| North Simcoe Muskoka Acquired Brain Injury Collaborative, Barrie | Barrie |
| North Simcoe Muskoka and District Labour Council | Orillia |
| North Simcoe Muskoka Hospice Palliative Care Network | Orillia |
| North Simcoe Muskoka Hospice Palliative Care Network, Orillia, Education and Palliative Pain and Symptom Management Consultations | Orillia |
| North Simcoe Muskoka Self Management Program, Wasaga Beach, Living a Healthy Life With Chronic Conditions or Chronic Pain | Wasaga Beach |
| North Simcoe Muskoka Self Management Program, Wasaga Beach, Powerful Tools for Caregivers | Wasaga Beach |
| North Simcoe Muskoka Specialized Geriatric Services | Barrie |
| North Simcoe Muskoka Specialized Geriatric Services, Barrie - Cundles Rd, Central Intake for Specialized Geriatric Services | Barrie |
| North Simcoe Ontario Health Team | Midland |
| North Simcoe Therapy Network, Collingwood, Psychotherapy | Collingwood |
| North Simcoe Victim Services, Orillia, Victim Crisis Assistance Ontario | Orillia |
| North Simcoe Youth Wellness Hub, North Simcoe | Midland |
| North York General Hospital, Toronto - Phillips House, Child and Adolescent Eating Disorders Program | Toronto |
| Northern Air Quality Services | Barrie |
| Northern Airport Passenger Service | North Bay |
| Northern Bruce Peninsula. Municipal Office, Lions Head, Fire and Emergency Services | Northern Bruce Peninsula |
| Northern Bruce Peninsula. Municipal Office, Mobile Service, Shuttle Bus Service | Northern Bruce Peninsula |
| Northern Bruce Peninsula. Municipal Office | Northern Bruce Peninsula |
| Northern Bruce Peninsula. Municipal Office, Tobermory, Fire and Emergency Services | Northern Bruce Peninsula |
| Northern Bruce Peninsula. Municipal Office, Various locations, Rest Stations for Extreme Weather Relief | Northern Bruce Peninsula |
| Northern Home Foot Care, Mobile Services, Medical Foot Care Services | Muskoka District |
| Northern Lights Children's Daycare, Summer Program | Keene |
| Northern Lights Children's Daycare, Before and After School Program | Otonabee-South Monaghan |
| Northern Lights Children's Daycare, Full Day Program | Otonabee-South Monaghan |
| Northern Lights Children's Daycare, Nursery School | Otonabee-South Monaghan |
| Northern Lights Children's Daycare, Summer Program | Otonabee-South Monaghan |
| Northern Sound Speech and Language Services, Mobile Service | Parry Sound |
| Northern Stars Montessori School & Daycare, Barrie | Barrie |
| Northminster Court | Peterborough |
| Northside Bible Chapel | Barrie |
| Northside United Church, Seaforth | Huron East |
| Northumberland Child and Youth Collaborative | Cobourg |
| Northumberland Child Development Centre, Infant and Child Development Program, Port Hope | Port Hope (Municipality of) |
| Northumberland Child Development Centre, Northumberland Bridges Program, Port Hope | Port Hope (Municipality of) |
| Northumberland Child Development Centre, Play Therapy, Port Hope | Port Hope (Municipality of) |
| Northumberland Child Development Centre, Port Hope, Administration | Port Hope (Municipality of) |
| Northumberland Child Development Centre, Speech and Language Program, Port Hope | Port Hope (Municipality of) |
| Northumberland Community Legal Centre, Cobourg | Cobourg |
| Northumberland County, Brighton, EarlyON Child and Family Centre | Brighton (Municipality of) |
| Northumberland County, Campbellford - Saskatoon Ave, EarlyON Child and Family Centre | Trent Hills |
| Northumberland County, Cobourg - 600 William St, Northumberland Tourism | Cobourg |
| Northumberland County, Cobourg - Courthouse Rd, Administration | Cobourg |
| Northumberland County, Cobourg - Courthouse Rd, Canada-Ontario Housing Benefit | Cobourg |
| Northumberland County, Cobourg - Courthouse Rd, Community and Social Services - Community Outreach Program | Cobourg |
| Northumberland County, Cobourg - Courthouse Rd, Community and Social Services - Early Years Services | Cobourg |
| Northumberland County, Cobourg - Courthouse Rd, Community and Social Services - Shelter Benefit | Cobourg |
| Northumberland County, Cobourg - Courthouse Rd, Community and Social Services - Social Assistance | Cobourg |
| Northumberland County, Cobourg - Courthouse Rd, Northumberland County Housing Services | Cobourg |
| Northumberland County, Cobourg - Courthouse Rd, Waste Management Facilities - Community Recycling Centres | Cobourg |
| Northumberland County, Cobourg - St Joseph Elementary School, EarlyON Child and Family Centre | Cobourg |
| Northumberland County, Cobourg, EarlyON Child and Family Centre | Cobourg |
| Northumberland County, Colborne, EarlyON Child and Family Centre | Cramahe |
| Northumberland County, Hastings, EarlyON Child and Family Centre | Hastings Highlands |
| Northumberland County, Port Hope - 90 Rose Glen Rd, EarlyON Child and Family Centre | Port Hope (Municipality of) |
| Northumberland County Archives and Museum | Cobourg |
| Northumberland County Food 4 All | Cobourg |
| Northumberland Family Health Team | Cobourg |
| Northumberland Fare Share Food Banks, Cobourg, Northumberland Fare Share Food Bank, Cobourg | Cobourg |
| Northumberland Fare Share Food Banks, Port Hope, Northumberland Fare Share Food Banks, Port Hope | Port Hope (Municipality of) |
| Northumberland Food for Thought | Northumberland County |
| Northumberland Hills Hospital, Auxiliary | Cobourg |
| Northumberland Hills Hospital, Cobourg - Elgin St W, Partner Assault Response | Cobourg |
| Northumberland Hills Hospital, Community Mental Health Services - Lynx Early Psychosis Intervention Program, Cobourg - Elgin St W | Cobourg |
| Northumberland Hills Hospital, Community Mental Health Services - Northumberland County Assertive Community Treatment Team, Cobourg - Elgin St W | Cobourg |
| Northumberland Hills Hospital, Community Mental Health Services - Supportive Housing Services, Cobourg - Elgin St W | Cobourg |
| Northumberland Hills Hospital, Community Mental Health Services - Walk-in Counselling Clinic, Cobourg - Elgin St W | Cobourg |
| Northumberland Hills Hospital, Community Mental Health Services - Crisis Program | Cobourg |
| Northumberland Hills Hospital | Cobourg |
| Northumberland Humane Society, Animal Shelter, Cobourg - Theatre Rd S | Cobourg |
| Northumberland Humane Society, Cobourg - Covert St, Thrift Shop | Cobourg |
| Northumberland Land Trust | Cobourg |
| Northumberland Promise Ministry | Cobourg |
| Northumberland United Way, Backpacks for Kids | Cobourg |
| Northumberland United Way, Northumberland Eats | Cobourg |
| Northumberland United Way | Cobourg |
| Northumberland Youth Unlimited, Cobourg, Youth Unlimited: Cobourg Programs | Cobourg |
| Northumberland Youth Unlimited, The Beacon Youth Centre, Brighton | Brighton (Municipality of) |
| Northumberland-Peterborough South Federal Liberal Association | Cobourg |
| Northview Day Care and Nursery School, Fairbairn St, Infants and Toddlers Rooms | Peterborough |
| Nottawasaga Cooperative Homes | New Tecumseth |
| Nottawasaga Futures, Alliston, Business Excellence Resource Centre | New Tecumseth |
| Nottawasaga Model Railway | Collingwood |
| Nottawasaga Valley Conservation Authority, Tiffin Centre for Conservation, Camp Tiffin | Utopia |
| Nottawasaga Valley Conservation Authority, Tiffin Centre for Conservation | Utopia |
| Nottawasaga Valley Conservation Authority, Tiffin Centre for Conservation | Utopia |
| NSA Slo Pitch League (Barrie) | |
| NSA Slo Pitch League (Barrie), Mailing Address, Indoor Winter Dome Slo-Pitch | Barrie |
| NSA Slo Pitch League (Barrie), Mailing Address, Outdoor Adult Summer Slo-Pitch | Midhurst |
| NT Power | Midland |
| Nurse Next Door Georgian Bay | Chatsworth |
| Nursery Two Child Care, Peterborough - Keith Wightman Public School, Keith Wightman - School Age Program | Peterborough |
| Nursery Two Child Care, Peterborough - Otonabee Valley Public School, Otonabee Valley - School Age Program | Peterborough |
| Nursery Two Child Care, Peterborough - St Alphonsus Catholic Elementary School, St. Alphonsus - Preschool and School Age Care | Peterborough |
| Nursery Two Child Care, St John - Preschool and School Age Care, Peterborough - St John Catholic Elementary School | Peterborough |
| Nventure | Cobourg |