These are zoning provisions that require very large (and ostensibly farmable - e.g. possessing prime agricultural soils) minimum lot sizes (one dwelling unit per 40- or 80- or even 160-acres, e.g.) in order to prevent farms from being subdivided into small residential lots.


Discourages speculative development and land conversion by keeping land subdivision at a large enough size and scale to continue to efficiently farm the resulting parcels for livestock, food or crop production.


Farmers may be prohibited or discouraged from selling or transferring smaller parcels of their land to their relatives or children, though regulatory "safety valves" allowing a limited number of family land transfers can be written into the ordinances.


Example 1: Wisconsin 

Farmland Preservation Zoning Ordinance

Description: A model ordinance from the state DOA.


Example 2: Lancaster County, Pennsylvania

Lancaster County Ordinance

Description: County-wide agricultural zoning ordinance.


Example 3: Pennsylvania 

Lower Mount Bethel CAPZO

Description: Comprehensive Agricultural Protection Zoning Ordinance