A. 
For the purposes of this chapter, the Town of Chelmsford is hereby divided into the following districts:
(1) 
RA - Residential A District. These are the lowest density single-family residence districts.
(2) 
RB - Residential B District. These are low-density single-family residence districts.
(3) 
RC - Residential C District. These are medium-density general residence districts.
(4) 
RM - Residential Multifamily District. These are high-density residence districts.
(5) 
CV - Center Village District. This district is for maintaining downtown village character.
[Added 10-21-1999 ATM by Art. 28]
(6) 
CA - Neighborhood Commercial District. These are commercial districts for neighborhood areas.
(7) 
CB - Roadside Commercial District. These are general commercial districts which are high traffic generators. Included are such uses as automotive repair, open lot sales, wholesale business, retail and offices and so on.
(8) 
CC - Shopping Center District. These are commercial districts designed to allow the clustering of stores, offices and so on around a central parking area. These are high traffic generators usually located on major roads.
(9) 
CD - General Commercial District. These are primarily retail commercial offices, restaurants and entertainment commercial uses, excluding repair, open lot sales, wholesale and storage uses. These uses are usually located along existing major traffic thoroughfares.
(10) 
CX - Adult Entertainment District. This is a commercial district created for adult entertainment establishments and other permitted uses as defined by this chapter.
(11) 
IA - Limited Industrial District. These are areas that are primarily used for office, research development, manufacturing and warehousing.
(12) 
IS - Special Industrial District. This district is suited for heavy industrial.
(13) 
RMH - Residential Mobile Home District. This is a district for mobile homes.
(14) 
P - Public District. These are lands owned or leased by federal, state or municipal governments for governmental purposes.
(15) 
OS - Open Space District. These are privately owned lands used for open space.
B. 
Overlay districts are also hereby created, as follows: CX, Aquifer Protection, Floodplain Overlay District, Community Enhancement and Investment Overlay District, and Village Center Overlay District.
[Amended 4-27-2009 ATM by Art. 19; 4-29-213 ATM by Art. 26; 10-21-2013 ATM by Art. 16; 4-28-2014 ATM by Art. 23]
The districts set forth above are shown on the Official Zoning Map, which, together with all explanatory material thereon, is hereby adopted by reference and declared to be part of this chapter. The Official Zoning Map shall be identified by the signature of the Chairperson of the Planning Board and attested by the Town Clerk bearing the Seal of the town. The Official Zoning Map is included as originally dated May 1963 and as most recently amended.[1]
[1]
Editor's Note: The Zoning Map is on file at the office of the Planning Board.
Where uncertainties exist as to the boundaries of districts as shown on the Official Zoning Map, the following shall apply:
A. 
Where the boundary lines are shown upon said map as approximately following the street lines of public and private ways or railways, the center lines of such ways shall be the boundary lines.
B. 
Where the boundary lines are shown approximately on the location of property lot lines and the exact location of property, lot or boundary lines is not indicated by means of dimensions shown in figures, then the property or lot lines shall be the boundary lines.
C. 
Boundary lines located outside of street lines and shown approximately parallel thereto shall be regarded as parallel to such street lines, and dimensions shown in figures placed upon said map between such boundary lines and street lines are the distance in feet of such boundary lines from such street lines, such distances being measured at right angles to such street lines unless otherwise indicated.
D. 
In all cases which are not covered by other provisions of this section, the location of boundary lines shall be determined by the distance in feet, if given, from other lines upon said map, by the use of identifications as shown on the map or by the scale of the map.
E. 
Where the district boundary line follows a stream, lake or other body of water, said boundary line shall be construed to be at the thread or channel of the stream or at the limit of the jurisdiction of the Town of Chelmsford, unless otherwise indicated.
F. 
Where a district boundary line divides any lot existing at the time such line is adopted, the regulations of any district in which the lot has frontage on a street may be extended by special permit from the Board of Appeals not more than 30 feet into the other district.
G. 
Where physical or cultural features existing on the ground are at variance with those shown on the Official Map or in other circumstances not covered by the above subsections, the Board of Appeals shall interpret the district boundaries.