St. Louis County (Unincorporated)
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Zoning districts
| District | Min lot | Width | Front / side / rear | Height | Density | Notes | |
|---|---|---|---|---|---|---|---|
| R-4 Residence (7,500 sf) | 7,500 sf | — | 20 / 6 / 15 ft | 45 ft | 5.8 du/ac | 3 stories or 45 ft for dwellings; other structures 60 ft. Nonresidential structures over 30 ft add 1 ft of setback per foot of height above 30 ft. | |
| R-2 Residence (15,000 sf) | 15,000 sf | — | 25 / 10 / 15 ft | 45 ft | 2.9 du/ac | 3 stories or 45 ft for dwellings; other structures 60 ft. Nonresidential structures over 30 ft add 1 ft of setback per foot of height above 30 ft. | |
| R-1A Residence (22,000 sf) | 22,000 sf | — | 25 / 12 / 15 ft | 45 ft | 1.98 du/ac | 3 stories or 45 ft for dwellings; other structures 60 ft. Nonresidential structures over 30 ft add 1 ft of setback per foot of height above 30 ft. | |
| R-7 Residence (apartments 1,750 sf/unit) | 4,500 sf | — | 20 / 5 / 15 ft | 200 ft | 24.9 du/ac | Structures up to 200 ft (air navigation rules may limit). Density shown is for multiple-family (1,750 sf per unit). | |
| C-3 Shopping | — | — | 15 / 15 / 15 ft | 200 ft | — | Up to 200 ft (air navigation rules may limit). Side and rear yards apply only next to NU, PS or R-zoned property; otherwise 0 ft. No minimum lot area. | |
| R-6 Residence (4,500 sf; apartments 2,000 sf/unit) | 4,500 sf | — | 20 / 5 / 15 ft | — | 21.8 du/ac | Dwellings 4 stories (counting basement living space); other structures 60 ft. Density shown is for multiple-family (2,000 sf per unit). | |
| R-6A Residence (4,500 sf; apartments 4,000 sf/unit) | 4,500 sf | — | 20 / 5 / 15 ft | — | 10.9 du/ac | Dwellings 4 stories (counting basement living space); other structures 60 ft. Density shown is for multiple-family (4,000 sf per unit). | |
| KP Karst Preservation | 3 ac | — | 50 / 20 / 20 ft | — | 0.33 du/ac | Same 3-acre lot and setbacks as NU, plus karst (sinkhole) protection rules. | |
| M-1 Industrial | — | — | 30 / 10 / 10 ft | 200 ft | — | No minimum lot area for most uses (towed-vehicle yards 1 ac; transfer stations 5 ac). Up to 200 ft (air navigation rules may limit). | |
| M-3 Planned Industrial | — | — | — | — | — | Planned district: standards are set by the ordinance that zones each site. | |
| R-5 Residence (6,000 sf) | 6,000 sf | — | 20 / 6 / 15 ft | 45 ft | 7.26 du/ac | 3 stories or 45 ft for dwellings; other structures 60 ft. Single-family attached allowed at 6,000 sf per unit; attached units and detached garages are exempt from the side and rear yards. Nonresidential structures over 30 ft add 1 ft of setback per foot of height above 30 ft. | |
| C-6 Office and Research Service | — | — | 15 / 15 / 15 ft | 45 ft | — | 3 stories or 45 ft. Side and rear yards apply only next to NU, PS or R-zoned property; otherwise 0 ft. No minimum lot area. | |
| M-2 Industrial | — | — | 30 / 10 / 10 ft | 200 ft | — | No minimum lot area for most uses (towed-vehicle yards 1 ac; transfer stations 5 ac). Up to 200 ft (air navigation rules may limit). | |
| C-7 General Extensive Commercial | — | — | 50 / 20 / 20 ft | 45 ft | — | 20 ft side and rear (no structures, storage or display) only next to NU, PS or R-zoned property; otherwise 0 ft. No minimum lot area except listed uses (junk yards 10 ac, correctional 5 ac). | |
| R-1 Residence (1 ac) | 1 ac | — | 30 / 15 / 15 ft | 45 ft | 1 du/ac | 3 stories or 45 ft for dwellings; other structures 60 ft. Nonresidential structures over 30 ft add 1 ft of setback per foot of height above 30 ft. | |
| NU Non-Urban | 3 ac | — | 50 / 20 / 20 ft | — | 0.33 du/ac | 3 acres per single-family home (existing smaller lots of record may hold one). 20 ft from all lines other than road right-of-way. Height limited only by the air navigation rules (§1003.161). | |
| C-8 Planned Commercial | — | — | — | — | — | Planned district: uses, setbacks and heights are set by the ordinance that zones each site. | |
| PS Park and Scenic | — | — | 25 / — / — ft | — | — | Parks and open space. 25 ft from road right-of-way; height limited only by air navigation rules. | |
| C-1 Neighborhood Business | — | — | 20 / 15 / 15 ft | 20 ft | — | 1 story or 20 ft. Side and rear yards apply only next to NU, PS or R-zoned property; otherwise 0 ft. No minimum lot area. Front setback matches adjoining R-zoned lots when theirs is deeper. | |
| FP Flood Plain | — | — | 25 / — / — ft | — | — | Applied with an underlying district (GIS shows it as a prefix, e.g. FPR3). Floodplain development permit and flood rules apply; 25 ft from road right-of-way. | |
| C-2 Shopping | — | — | 15 / 15 / 15 ft | 40 ft | — | 2 stories or 40 ft. Side and rear yards apply only next to NU, PS or R-zoned property; otherwise 0 ft. No minimum lot area. | |
| MXD Mixed Use Development | — | — | — | — | 60 du/ac | Standards are set by the ordinance for each MXD; density never over 60 units per acre (excluding road right-of-way). | |
| R-6AA Residence (4,500 sf; apartments 3,000 sf/unit) | 4,500 sf | — | 20 / 5 / 15 ft | — | 14.5 du/ac | Dwellings 4 stories (counting basement living space); other structures 60 ft. Density shown is for multiple-family (3,000 sf per unit). | |
| R-8 Residence (apartments 500 sf/unit) | 4,500 sf | — | 20 / 5 / 15 ft | 200 ft | 87.1 du/ac | Structures up to 200 ft (air navigation rules may limit). Density shown is for multiple-family (500 sf per unit). | |
| C-4 Highway Service Commercial | — | — | 50 / 20 / 20 ft | 45 ft | — | 20 ft side and rear (no structures, storage or display) only next to NU, PS or R-zoned property; otherwise 0 ft. No minimum lot area. | |
| R-3 Residence (10,000 sf) | 10,000 sf | — | 20 / 8 / 15 ft | 45 ft | 4.36 du/ac | 3 stories or 45 ft for dwellings; other structures 60 ft. Lots 60 ft wide or less: side yard 10% of lot width, at least 5 ft. Front setback may match the average of neighbors within 10 ft variation. Nonresidential structures over 30 ft add 1 ft of setback per foot of height above 30 ft. |
Source: St. Louis County (Unincorporated) zoning code (each district links to its section) · verified Mon, Oct 12, 2026
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