| 1938 | Clifford R. Zinn started the agency in his home in Myerstown, Pennsylvania. |
| 1963 | Clifford's son, Joel H. Zinn, joined the agency. The agency was incorporated as Clifford R. Zinn & Son, Inc. and the office was moved to 13 W. Main Avenue in Myerstown. |
| 1968 | Clifford Zinn retired from the family business and Joel became owner. |
| 1970 | The agency made its first business acquisition. Others would follow over the years. |
| 1972 | The office moved to its present location at 16 E. Main Avenue in Myerstown. |
| 1985 | Joel's son, Greg Zinn, joined the family business. |
| 1987 | Joel's second son, Jonathan Zinn, joined the family business. |
| 1988 | Clifford R. Zinn & Son, Inc. began doing business as Zinn Insurance. |
| 1997 | Joel retired from the family business and sold it to his two sons. Zinn Insurance became one of the founding members of The Insurance Alliance of Central PA, a collective group of leading independent insurance agencies located in Central Pennsylvania formed to expand markets and services to their local communities. |
| 1998 | Zinn acquired the Samuel G. Kurtz Agency in Lebanon, Pennsylvania; and kept its Lebanon office, creating a second location for Zinn Insurance. |
| 2000 | A managing agency relationship was formed with the Lebanon-based Samuel F. Light Agency. The Light Agency moved into Zinn's Lebanon office. Zinn Insurance provides all in-office and back-office functions for the Light Agency which in turn is responsible for all sales and growth related activities. |
| 2004 | Zinn Insurance expanded its life insurance and related services by forming a service alliance with Christopher and Earl Wenger. The Wengers are authorized brokers of First Financial Group and sell personal life, health and disability products. |
| 2006 | Zinn Advisers was formed – through an alliance with Northeast Advisers of Malvern, Pennsylvania – to offer fee-based investment advisory services to its customers. |
| 2007 | Zinn Insurance formed a similar alliance with Shalters Insurance of Lebanon, which provides group life and health products and services. |
