Groton, CT zoning districts
What each zoning code in Groton stands for, read from the town's own adopted regulations. Every parcel we list carries one of these codes; this is where you check what it permits.
Read Groton's zoning regulations
| Code | District | Type | Parcels | Opportunities | Our reading |
|---|---|---|---|---|---|
| RS-12 | Residential Single-Unit-12the zone you clicked | Residential | 1,656 | 0 | Single Family |
| R-12 | Residential-12the zone you clicked | Residential | 1,267 | 0 | Unclear |
| RS-20 | Residential Single-Unit-20the zone you clicked | Residential | 1,178 | 0 | Single Family |
| RM | Residential Multi-Unitthe zone you clicked | Residential | 1,105 | 24 | Multi-family |
| RU-40 | Rural Residential-40the zone you clicked | Residential | 1,055 | 0 | Single Family |
| R52 | —the zone you clicked | None | 943 | 0 | Unclear |
| RU-20 | Rural Residential-20the zone you clicked | Residential | 673 | 0 | Single Family |
| R | —the zone you clicked | None | 662 | 0 | Single Family |
| R8 | —the zone you clicked | None | 518 | 0 | Single Family |
| R51 | —the zone you clicked | None | 501 | 0 | Single Family |
| R-20 | —the zone you clicked | None | 313 | 0 | Single Family |
| RV | —the zone you clicked | None | 252 | 0 | Unclear |
| CR | Commercial, Regionalthe zone you clicked | Business | 211 | 0 | Single Family |
| RU-80 | Rural Residential-80the zone you clicked | Residential | 209 | 0 | Unclear |
| R-40 | —the zone you clicked | None | 177 | 0 | Single Family |
| WW | Working Waterfrontthe zone you clicked | Mixed Use | 160 | 0 | Single Family |
| MVC | Mixed-Use Village Centerthe zone you clicked | Mixed Use | 144 | 0 | Unclear |
| MDD | Mystic Downtown Districtthe zone you clicked | Mixed Use | 135 | 0 | Unclear |
| GC | Green, Conservationthe zone you clicked | Special | 130 | 0 | Single Family |
| FC | —the zone you clicked | None | 109 | 0 | Unclear |
| IG | Industrial, Generalthe zone you clicked | Industrial | 109 | 0 | Single Family |
| CN | Commercial, Neighborhoodthe zone you clicked | Business | 106 | 0 | Unclear |
| MTC | Mixed-Use Town Centerthe zone you clicked | Mixed Use | 104 | 0 | Single Family |
| R-7 | Residential-7the zone you clicked | Residential | 103 | 0 | Unclear |
| WBR | Waterfront Business Residence Districtthe zone you clicked | Mixed Use | 91 | 18 | Multi-family |
| IM | Industrial, Mixed-Usethe zone you clicked | Industrial | 85 | 0 | Single Family |
| TC | —the zone you clicked | None | 21 | 0 | Unknown |
| I/T | —the zone you clicked | None | 18 | 0 | Unknown |
| R12 | —the zone you clicked | None | 16 | 0 | Unknown |
| GR | Green, Recreationthe zone you clicked | Special | 14 | 0 | Unknown |
| WC | —the zone you clicked | None | 14 | 0 | Unknown |
| ROS | —the zone you clicked | None | 12 | 0 | Unknown |
| CV | —the zone you clicked | None | 9 | 0 | Unknown |
| VC | —the zone you clicked | None | 8 | 0 | Unknown |
| CM | —the zone you clicked | None | 3 | 0 | Unknown |
| R-MI | —the zone you clicked | None | 3 | 0 | Unknown |
Our reading is derived from what is actually built in each district today, not from the code string — a code like R-15 means different things in different Connecticut towns. It is an estimate, and the regulations linked above are the authority.
Where these names come from
Read the Town of Groton Zoning Regulations PDF linked from the Planning & Development regulations page ('FINAL Tables Changed 7-15-26 Groton_Zoning_Regulations no buttons.pdf'): first adopted 6/21/1957, recodified and adopted 7/17/2019 effective 10/1/2019, revised 7/15/2026. District list is verbatim from Sec. 3.1-3.5; WRPD is from Sec. 6.4 ('The Water Resource Protection District (WRPD) is established as an overlay district'). Note NMDD (Nautilus Memorial Design District) was deleted effective 1/15/2020 and R-MI was added effective 7/15/2025. Unmatched assessor codes R, R8, R-20, R-40, R51, R52, RV, FC and WBR appear nowhere in these regulations (verified by full-text search) - the Town of Groton contains the separately incorporated City of Groton and the Groton Long Point Association, which have their own zoning ordinances, and these codes are also consistent with pre-2019 legacy town codes; I could not attribute them from the ordinance at the given URL.