| Business | Phone |
| Donnelly Corp 12390 Riley St, Holland 49424 | (616) 786-7000 |
| Donnelly Corp 3501 John F Donnelly Dr, Holland 49424 | (616) 786-7932 |
| Donnelly Corp 4190 Sunnyside Dr # B, Holland 49424 | (616) 994-6865 |
| Optera Inc 414 E 40th St, Holland 49423 | (616) 786-5300 |