Lyman & Sheets enjoys relationships with the following associations:
- American Legion
- Associated Builders & Contractors
- Associated Food & Petroleum Dealers
- Associated General Contractors
- Cherry Marketing Association
- Clinton County Chamber of Commerce
- Construction Financial Management Association
- Greater Lansing Association of Realtors
- Greater Lansing Home Builders Association
- Kiwanis Club
- Lansing Economic Area Partnership
- Lansing Regional Chamber of Commerce
- Lansing Rotary
- Livingston County Home Builders Association
- Michigan Asparagus, Plum and Onion Committees
- Michigan Association of Broadcasters
- Michigan Association of Governmental Employees
- Michigan Association of Home Builders
- Michigan Association of Realtors
- Michigan Audubon Society
- Michigan Beer and Wine Wholesalers Association
- Michigan Business & Professional Association
- Michigan Community College Association
- Michigan Concrete Association
- Michigan Equality Education Fund
- Michigan Equine Partnership
- Michigan Floriculture Growers Association
- Michigan Food & Beverage Association
- Michigan Forestry & Park Association
- Michigan High School Athletic Association
- Michigan Housing Council
- Michigan Library Association
- Michigan Licensed Beverage Association
- Michigan Manufacturers Association
- Michigan Meat Association
- Michigan Museums Association
- Michigan Non-Profit Association
- Michigan Nursery & Landscape Association
- Michigan Optometric Association
- Michigan Orthotics & Prosthetics Association
- Michigan Retailers Association
- Michigan State Employees Association
- Michigan Trucking Association
- Michigan Veterinary Medical Association
- Mid Michigan Mechanical Contractors Association
- National Association of Electrical Contractors
- National Association of Legal Investigators
- Public Risk Managers Association – Michigan Chapter
- Small Business Association of Michigan
- Thomas M. Cooley Law School – Student Bar Association
- World Association of Detectives