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Zoning Code Directory

Below are brief explanations of each zoning code used in Montgomery County. The full text of the Montgomery County Zoning Ordinance can be seen online by clicking here.

Agricultural Zones
Residential Zones
Commercial Zones
Industrial Zones
Central Business District Zones
Planned Unit Development Zones
Transit Station Development Zones
Residential Mixed Use Zones
Mixed Use Town Center Zones
Mineral Resource Zones
Transit Oriented, Mixed Use Zones
Overlay Zones

CURRENT ZONE CODE DIRECTORY
ZONE
GENERAL AREA AND/OR DENSITY REQUIREMENTS*
Agricultural Zones
RURAL
Rural Zone
minimum net lot area: 5 acres
RC
Rural Cluster
minimum net lot area: 5 acres
RC
Low Density Cluster Option
minimum net lot area: 40,000 sq.ft.
RDT
Rural Density Transfer Zone
minimum net lot area: 40,000 sq.ft.
RNC
Rural Neighborhood Cluster
minimum net lot area: 25,000 sq.ft.
RNC
Rural Neighborhood Cluster: Optional Method
minimum tract area: 10 acres, maximum 1.22 dwelling units/gr. acre
RNC/TDR Rural Neighborhood Cluster/Transferable Development Rights: Standard Method
minimum net lot area: 25,000 sq.ft.
RNC/TDR Rural Neighborhood Cluster/Transferable Development Rights: Optional Method
minimum net lot area: 4,000 sq.ft. detached, 3,500 sq.ft. semi-detached; maximum 1.22 dwelling units/gross acre
RS
Rural Service Zone
minimum net lot area: 2 acres
LDRCDZ
Low Density Rural Cluster Development Zone
minimum net lot area: 5 acres
LDRCDZ
Cluster Option
minimum net lot area: 40,000 sq.ft.
Residential Zones
RE-2
One-Family detached
minimum net lot area: 2 acres
RE-2/TDR
Optional Method
maximum 4 dwelling units/acre
RE-2C
One-Family
minimum net lot area: 2 acres
RE-2C/TDR
Optional Method
maximum 2 dwelling units/acre
RE-1
One-Family
minimum net lot area: 40,000 sq.ft.
RE-1/TDR
Transferable Development Rights - Optional Method
maximum 2 dwelling units/acre
R-200
One-Family
minimum net lot area: 20,000 sq.ft.
R-200/TDR
Transferable Development Rights - Optional Method
maximum 11 dwelling units/acre
R-150
One-Family
minimum net lot area: 20,000 sq.ft.
R-150/TDR
Transferable Development Rights - Optional Method
maximum 6 dwelling units/acre
R-90
One-Family
minimum net lot area: 9,000 sq.ft.
R-90/TDR
Transferable Development Rights - Optional Method
maximum 28 dwelling units/acre
R-60
One-Family
minimum net lot area: 6,000 sq.ft.
R-60/TDR
Transferable Development Rights - Optional Method
maximum 28 dwelling units/acre
R-40
One-Family
minimum net lot area: 6,000 sq.ft. detached; 4,000 sq. ft. semidetached; 8,000 sq.ft. 2-family
RMH
Planned mobile home parks
minimum tract area: 15 acres, maximum of 7 dwelling units/acre (of usable area)
RMH-200
One-Family/mobile homes
minimum tract area: 5 acres, minimum net lot area : 20,000 sq.ft.
RT-6
Townhouse
minimum tract area: 20,000 sq.ft.; 6 dwellings units/acre
RT-8
Townhouse
minimum tract area: 20,000 sq.ft.; 8 dwellings units/acre
RT-10
Townhouse
minimum tract area: 20,000 sq.ft.; 10 dwellings units/acre
RT-12.5
Townhouse
minimum tract area: 20,000 sq.ft.; 12.5 dwellings units/acre
RT-15
Townhouse
minimum tract area: 40,000 sq.ft.; 15 dwellings units/acre
R-4PLEX
Fourplex
minimum tract area: 20,000 sq.ft.; 12.5 dwellings units/acre
R-30
Multiple-Family
minimum net lot area: 12,000 sq. ft.; 3,000 sq.ft./dwelling
R-30/TDR
Transferable Development Rights - Optional Method
maximum 40 dwelling units/acre
R-20
Multiple-Family
minimum net lot area: 16,000 sq. ft.; 2,000 sq.ft./dwelling
R-20/TDR
Transferable Development Rights - Optional Method
maximum 50 dwelling units/acre
R-10
Multiple-Family
minimum net lot area: 20,000 sq. ft.; 1,000 sq.ft./dwelling
R-10/TDR
Transferable Development Rights - Optional Method
maximum 100 dwelling units/acre
R-H
Multiple-Family, High-Rise Planned Residential
minimum net lot area: 40,000 sq. ft. (1,000-1400 sq.ft./dwelling)
Commercial Zones
C-T
Commercial, Transitional
maximum floor area ratio: 0.5 (new construction)
O-M
Office Building,Moderate Intensity
maximum floor area ratio: 1.5
C-O
Commercial, Office Building
floor area ratio: 1.5 (up to 3 with site plan)
C-P
Commercial, Office Park
minimum tract area: 5 acres; minimum net lot area: 2 acres
C-1
Convenience Commercial
maximum tract area: 15 acres
C-2
General Commercial
maximum floor area ratio: 1.5 (up to 2.5 if only 1.0 is commercial located or ground floor)
C-2
Transit
minimum tract area: 40,000 sq.ft.; maximum floor area: 2.0
C-3
Highway Commercial
n/a
C-4
Limited Commercial
maximum floor area ratio: 0.25
C-5
Low Density, Office Commercial
maximum floor area ratio: 0.25
C-6
Low Density, Regional Commercial
minimum tract area: 40 acres; maximum floor area ratio: 0.25 - 0.5
H-M
Hotel - Motel
minimum tract area: 2 acres; maximum floor area ratio: 1.0
C-INN
Country Inn Zone
minimum net lot area: 2 acres
Industrial Zones
I-1
Light Industrial
n/a
I-2
Heavy Industrial
n/a
I-3
Technology & Business Park
minimum tract area: 2 - 20 acres; minimum net lot area: 2 acres; maximum floor area ratio: 0.5 - 0.6
I-3
Optional
minimum tract area: 2 - 20 acres; maximum 8 - 12.5 dwelling units/acre
I-4
Low Intensity, Light Industrial
minimum tract area: 2 - 10 acres; minimum net lot area: 1 acre; maximum floor area ratio: 1.0
R&D
Research and Development
minimum net lot area: 2 acres; maximum floor area ratio: 0.3 - 0.5
LSC
Life Sciences Center
maximum floor area ratio: 0.3 - 0.5
Central Business District Zones
CBD-0.5
Central Business District 0.5
minimum lot area: 18,000 sq. ft. (optional method); non-residential floor area ratio: 0.5
CBD-R1
Central Business District, Residential, 1.0
minimum lot area: 18,000 sq. ft. (optional method); non-residential floor area ratio: 1.0
CBD-R2
Central Business District, Residential, 2.0
minimum lot area: 18,000 sq. ft. (optional method); non-residential floor area ratio: 1.0
CBD-1
Central Business District 1.0
minimum lot area: 18,000 sq. ft. (optional method); non-residential floor area ratio: 1.0
CBD-2
Central Business District 2.0
minimum lot area: 18,000 sq. ft. (optional method); non-residential floor area ratio: 2.0
CBD-3
Central Business District 3.0
minimum lot area: 18,000 sq. ft. (optional method); non-residential floor area ratio: 3.0
Planned Unit Development Zones
PD
Planned Development
All Planned Development categories must meet one of five criteria for minimum area
PD-2
Low
minimum: 2 dwelling units/acre;
maximum: 2 du/a
PD-3
Low
minimum: 2 dwelling units/acre;
maximum: 3 du/a
PD-4
Medium low
minimum: 2 dwelling units/acre;
maximum: 4 du/a
PD-5
Medium low
minimum: 2 dwelling units/acre;
maximum: 5 du/a
PD-7
Medium low
minimum: 2 dwelling units/acre;
maximum: 7 du/a
PD-9
Medium
minimum: 2 dwelling units/acre;
maximum: 9 du/a
PD-11
Medium
minimum: 2 dwelling units/acre;
maximum: 11 du/a
PD-13
Medium
minimum: 2 dwelling units/acre;
maximum: 13 du/a
PD-15
Medium high
minimum: 2 dwelling units/acre;
maximum: 15 du/a
PD-18
Medium high
minimum: 2 dwelling units/acre;
maximum: 18 du/a
PD-22
Medium high
minimum: 2 dwelling units/acre;
maximum: 22 du/a
PD-25
Medium high
minimum: 2 dwelling units/acre;
maximum: 25 du/a
PD-28
High
minimum: 2 dwelling units/acre;
maximum: 28 du/a
PD-35
High
minimum: 2 dwelling units/acre;
maximum: 35 du/a
PD-44
High
minimum: 2 dwelling units/acre;
maximum: 44 du/a
PD-60
Urban high
minimum: 2 dwelling units/acre;
maximum: 60 du/a
PD-68
Urban high
minimum: 2 dwelling units/acre;
maximum: 68 du/a
PD-75
Urban high
minimum: 2 dwelling units/acre;
maximum: 75 du/a
PD-88
Urban high
minimum: 2 dwelling units/acre;
maximum: 88 du/a
PD-100
Urban high
minimum: 2 dwelling units/acre;
maximum: 100 du/a
TS
Town Sector
minimum tract area: 1500 acres;
maximum 15 persons/acre
PN
Planned Neighborhood
1-15 persons/acre; "as would house not fewer than 450 children of elementary school age"
PRC
Planned Retirement Commununity
minimum tract area: 25 acres; maximum 10 dwelling units/acre (age-restricted); maximum 6 dwelling units/acre (non age-restricted)
MXN
Mixed Use Neighborhood Zone
minimum tract area: 20 acres;
MXPD
Mixed Use Planned Development
minimum tract area: 20 acres; maximum 44 dwelling units/acre in residential areas; 75 du/a in commercial areas
PCC
Planned Cultral Center
minimum tract area: 5 acres
Transit Station Development Zones
TS-R
Transit Station, Residential
maximum area: 18,000 sq. ft.; maximum floor area ratio: 2.5
TS-M
Transit Station, Mixed
maximum area: 40,000 sq. ft.; maximum floor area ratio: 3.0
Residential Mixed Use Zones
RMX-1
Community Center
must comply with optional or standard methods of R-200 zone
RMX-1/TDR
Residential-Mixed Use Community Center/Transferrable Development Rights
maximum 11 dwelling units/acre
RMX-2
Speciality Center
must comply with optional or standard methods of R-200 zone
RMX-2/TDR
Residential-Mixed Use Speciality Center/Transferrable Development Rights
maximum 11 dwelling units/acre
RMX-2C
Speciality Center, Commercial Base
maximum floor area ratio: 0.3
RMX-2C/TDR
Speciality Center, Commercial Base/Transferrable Development Rights
maximum floor area ratio: 0.3
RMX-3
RegionalCenter
must comply with optional or standard methods of R-200 zone
RMX-3/TDR
Residential-Mixed Use Regional Center/Transferrable Development Rights
maximum 11 dwelling units/acre
RMX-3C
Regional Center, Commercial Base
maximum floor area ratio: 0.3
Mixed Use Town Center Zones
MXTC
MXTC/TDR
 
Standard: maximum 8 dwelling units/acre; .35 FAR
Optional: maximum 20 dwelling units/acre; 1.0 FAR
Mineral Resource Zones
MRR
Mineral Resource Recovery Zone; with minerals
n/a
MRR
Mineral Resource Recovery Zone; without minerals
n/a
Transit Oriented, Mixed Use Zones
TOMX
Standard
maximum floor area ratio: 0.5
TOMX
Optional
minimum net lot area: 18,000 sq. ft.; maximum floor area ratio: 2.0
TOMX/TDR
Transferrable Development Rights/Standard
not using TDR: maximum 20 dwelling units/acre and 0.5 floor area ratio. Using TDR: additional 20% for both
TOMX/TDR
Transferrable Development Rights/Optional
minimum net lot area: 18,000 sq. ft.;
Not using TCR: maximum 40 du/a and 1.6 FAR
Using TDR: additional 20% for both
Overlay Zones
 
Retail preservation for the Wheaton CBD (1990)
 
Residential and open space preservation for Town of Garret Park (1993)
 
Retail preservation for Arlington Road District Bethesda CBD Sector Plan (1994)
 
Cherry Hill Road Employment Area of the Fairland Master Plan (1997)
 
 
Burtonsville Employment Area of Fairland Master Plan (1997)
 
 
Environmental Overlay Zone for Upper Paint Branch Special Protection Area (1997)
 
 
Chevy Chase comparison retail (1998)
 
 
Chevy Chase neighborhood retail preservation (1998)
 
 
Sandy Spring/Ashton Rural Village (1998)
 
 
Fenton Village
 
 
Ripley/South Silver Spring
 
 
Takoma Park/East Silver Spring commercial revitalization
 
 
Neighborhood retail
 
 
Rural Village Center
 
 
Environmental overlay zone for the Upper Rock creekSpecial Protection Area
 
* Please refer to the Montgomery County Zoning Ordinance for detailed information.

Date of last update: September 26, 2008