- Maintenance, Cleaning & Sanitation, Callao
- Manufacturing, Callao
- Marinas & Marina Services, Callao
- Marine Supplies & Equipment, Callao - Boat Supplies
- Martial Arts & Self Defense Schools, Callao
- Masonry Materials & Supplies, Callao
- Methodist Church, Callao
- Mexican Restaurants, Callao
- Mildew Removal & Control, Callao - Mold Removal
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