Glenn County Unincorporated, California Zoning Map

Agricultural Preserve (AP) and Exclusive Agricultural (AE) zones are designed to protect prime farmland from conversion, and the county's zoning ordinance imposes strict limitations on non-agricultural development in these districts. Williamson Act contracts cover large portions of preserve-zoned land, which further restricts development and requires a lengthy non-renewal process before conversion is possible. Buyers evaluating agricultural parcels for any non-farming purpose must assess both the zoning designation and the presence of Williamson Act or Farmland Security Zone contracts.

The Rural Residential Estate zones (RE-1, RE-2, RE-5, RE-10, RE-NW) collectively cover approximately 7,524 acres and allow estate-scale residential development on large lots, while the Agricultural Transitional zone (AT-10, 586.84 acres) offers a path for rural residential on transitional farmland. Standard single-family residential (R-1) is available on only 641.3 acres concentrated in the county's small communities. Multifamily is practically limited to the R-M zone at 83.85 acres and the Mixed Use Residential (MU-R) zone at 10.19 acres.

Industrial uses are centered in the M Industrial zone (1,609.54 acres) and the Industrial Park (MP, 171.71 acres), which together represent the county's primary manufacturing and logistics corridor. Commercial activity clusters around highway access points in the HVC (Highway and Visitor Commercial, 358.77 acres) and PDC (Planned Development Commercial, 386.69 acres) zones. The small Community Commercial (CC, 69.43 acres) and Local Commercial (LC, 56.21 acres) zones serve existing community centers.

The RZ-160 zone at 213,442.27 acres covers the county's extensive foothill and range areas, primarily intended for open space, grazing, and compatible recreational uses at very low intensities. Development within this zone is typically limited to agricultural support structures, ranch residences on large parcels, and public or private recreation facilities. Buyers considering this zone for any commercial recreational project - such as a retreat, winery, or agritourism operation - must analyze specific conditional use permit pathways in the county code.

The FA-160 zone (29,322.95 acres) is designed for foothill lands where farming, grazing, and timber production coexist, and it accommodates uses that may not fit cleanly into the flatland agricultural preserve framework. Unlike the AP zones that focus on row crops and orchards on the valley floor, FA-160 parcels typically involve mixed terrain with both rangeland and timber potential. Development expectations in this zone are similar to preserve zones - very limited non-agricultural uses - but the specific permitted uses and permit requirements differ and should be confirmed with the county planning department.