- MercyOne Primghar Medical Center
- MercyOne Sioux City
- MercyOne Waterloo Medical Center
- Meredith Corp.
- Merit Construction Company
- Methodist Jennie Edmundson
- Methodist West
- Michael Foods Inc.
- Midstates Bank, NA
- Midwest One Financial Group
- Mitchell County Regional Health Center
- Mitchellville Public Library
- Monroe County Hospital
- Monsanto Co.
- Montgomery County Memorial Hospital
- MPW
- Mycogen Seeds
- Myers-Cox Co.
- Myrtue Medical Center
- Namasco
- Nashua Area EMS
- North Star Steel Iowa
- Northwest Bank and Trust Co.
- Northwoods State Bank
- NSK Corp.
- Omaha Standard, Inc.
- Orange City Area Health System
- Osceola Community Hospital, Inc.
- Osceola County Co-Op Oil Co.
- Osceola Regional Health Center
- Ottumwa Regional Health Center
- Palo Alto County Health System
- Pella Corp.
- Pella Regional Health Center
- Peoples Community Health Care
- Pepsi Americas
- Pepsi Cola Bottling Co.
- Perfection Oil Co.
- Perishable Distributors of Iowa
- Plaza Auto Auction
- PMX Industries, Inc.
- Pocahontas Community Hospital
- Polk County Medical Examiner
- Polk County Regional Facilities
- Primary Health Center Marshalltown Medical Clinic
- Principal Financial Group - Des Moines
- Principal Financial Group - Hiawatha
- Proctor and Gamble Co.
- Producers Co-Op
- Quality Inn and Suites, Council Bluffs, IA