The methodologies and data used in this study will enable future researchers to easily update the economic impact of the state-county farmland preservation program. Some important factors will vary from year to year, such as the state and county funding for farmland preservation, the number of farms and acres preserved, and the value of agricultural output of preserved farms. Similarly, the multiplier effect may require new estimation over time. But as more farmland is preserved, the value of farmland in terms of environmental benefits will surely increase.