- Machine Shop & Tool Repair Service, Ottumwa
- Machinery, Supplies & Equipment - Business Supplies Related, Ottumwa
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ottumwa
- Major Appliances, Ottumwa - Household & Kitchen
- Malls & Shopping Centers, Ottumwa
- Management Consultants & Services, Ottumwa
- Manicurists & Pedicurists, Ottumwa
- Manufacturing, Ottumwa
- Manufacturing Products, Ottumwa
- Marriage & Family Counselors, Ottumwa
- Masonry Contractors, Ottumwa - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Ottumwa
- Massage Therapists & Professional, Ottumwa
- Massage Therapy, Ottumwa
- Mechanical Contractors, Ottumwa - Install, Service & Repair
- Medical Diagnostic Clinics, Ottumwa - Clinical Labs & Centers
- Medical Groups & Clinics, Ottumwa - Medical & Health Centers
- Medical Supplies & Equipment, Ottumwa
- Meeting & Event Planning Services, Ottumwa - Conference Consultants
- Membership Sports & Recreation Clubs, Ottumwa
- Men's & Boys Clothing & Accessories Stores, Ottumwa
- Mens & Boys Jeans & Western Wear Stores, Ottumwa
- Mental & Developmental Information & Referral Services, Ottumwa
- Mental Health Clinics, Ottumwa - Treatment Centers
- Mental Health Specialists, Ottumwa - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Ottumwa
- Metal Buildings, Ottumwa - Kits, Homes, Steel Buildings, etc
- Methodist Church, Ottumwa
- Mexican Restaurants, Ottumwa
- Mini & Self Storage, Ottumwa
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- Mining, Ottumwa
- Ministries Church, Ottumwa
- Miscellaneous Household Item Repair, Ottumwa
- Miscellaneous Business Services, Ottumwa
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Ottumwa
- Miscellaneous Government, Ottumwa
- Miscellaneous Personal Services, Ottumwa
- Miscellaneous Photographers, Ottumwa
- Miscellaneous Professional, Ottumwa
- Mobile Home Parks & Communities , Ottumwa
- Money Transfer Service, Ottumwa
- Monuments, Tombstones, Markers & Memorials, Ottumwa
- Mortgage Bankers & Correspondents, Ottumwa
- Mortgage Contracts & Services, Ottumwa
- Mortgages & Loans, Ottumwa
- Motor Vehicle, Ottumwa
- Motor Vehicle Rental & Leasing, Ottumwa
- Motorcycle & Motor Scooters Dealers, Repair & Service, Ottumwa
- Motorcycle Parts, Accessories & Dealers, Ottumwa
- Motorcycle Repair & Service, Ottumwa
- Movie Theaters, Ottumwa
- Moving Companies, Ottumwa
- Moving Supplies & Equipment Rental, Ottumwa
- Moving Truck Rental , Ottumwa
- Muffler Shop & Exhaust Systems, Ottumwa
- Museums, Ottumwa
- Music, Ottumwa
- Musical Instruments & Equipment Stores, Ottumwa
- Musical Recording Services, Ottumwa
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