Growth was quick and steady, but IMA remained thoughtful in its growth and service. By its second year, IMA’s list of members had grown from six to 12, and 80 major corporations donated regularly. Annual donations of medical products in 1963 stood at $300,000, and they grew to $9 million by 1968. Meeting minutes reflect diligent work by the Board of Directors to establish policies to ensure standards for managing donated medical products as well as procedures to ensure equitable distribution of products to member agencies. In 1969, the Brethren Service Center built a new warehouse to accommodate IMA’s increasing inventory.
With the official “ribbon cutting” taking place on June 18, 1981, the IMA headquarters office moved from 475 Riverside Drive in New York to New Windsor, Maryland. In approving the move, the IMA board acknowledged the positive relationship between IMA, its members and the Church of the Brethren, and they anticipated lower operating costs, as well as better opportunities for IMA to consolidate operations, if its staff and assets were located in one physical place.
Though IMA maintained a small staff—only a handful—millions of dollars worth of donated medicines and supplies came in and were sent back out of the warehouse each year to dozens of countries all over the world. In 1989, IMA was listed in the Non-Profit Times as number 95 in the list of 100 largest U.S. charities. U.S. News and World Report and Money Magazine also listed IMA as the second-highest rated charity for diverting the smallest proportion of income to administration or fundraising activities.