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About King County zoning
General information about zoning codes for unincorporated King County
Each city in King County has jurisdiction over their own zoning, land use and permits while King County manages zoning, land use and permits for unincorporated areas in the county.
For help with permitting in unincorporated King County consult the Permitting Division of the Department of Local Services.
Official zoning information is in the King County code 24_30_Title_21A (PDF version here)
Base Codes
(Note: "DU" stands for "Dwelling Unit")
| A-10 | Agricultural, one DU per 10 acres |
| A-35 | Agricultural, one DU per 35 acres |
| F | Forest |
| M | Mineral |
| RA-2.5 | Rural Area, one DU per 5 acres (not a typo) |
| RA-5 | Rural Area, one DU per 5 acres |
| RA-10 | Rural Area, one DU per 10 acres |
| UR | Urban Reserve, one DU per 5 acres |
| R-1 | Residential, one DU per acre |
| R-4 | Residential, four DU per acre |
| R-6 | Residential, six DU per acre |
| R-8 | Residential, eight DU per acre |
| R-12 | Residential, 12 DU per acre |
| R-18 | Residential, 18 DU per acre |
| R-24 | Residential, 24 DU per acre |
| R-48 | Residential, 48 DU per acre |
| NB | Neighborhood Business |
| CB | Community Business |
| RB | Regional Business |
| O | Office |
| I | Industrial |
Development Conditions
Base zoning codes may be modified by one of more of the following development codes.
| P: | Parcel-specific condition | |
| SO: | Special district Overlay | |
| DPA: | Demonstration Project Area | |