Companies catalogue
- N-Kho Lumber and Hardware, Bangued
- NWORLD BY: MIKE DANDEL CABUSAS, Narvacan
- Naimas Food Corporation, Vigan City
- Nartutez Tarpaulin Printing, Candon
- Narvacan Vegetables, Onion Garlic Growers Association, Narvacan
- National Statistics Office - Ilocos Sur, Vigan City
- Net Every Juan Internet Shop, Vigan City
- New Born Home & Builders Centre - Bantay, Bantay
- Nina's and Joven's Trading, Orani
- Nita Glassware And Furniture, Bangued
- No.1 Hydraulic Corporation, Pilar
- Nokia Electronics Store, Vigan City
- Nokia Electronics Store, Bangued
- Nokia Electronics Store, Bangued
- Nokia Electronics Store, Candon
- North Exchange Marketing, Vigan City
- Northcoast Oil Trading, San Vicente
- Northcoast Oil Trading, Bantay