Municipal identification codes in Ontario

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| Published , updated May 1, 2024

DGUID

Dissemination Geography Unique Identifier – DGUID is an alphanumeric code, composed of four components. It varies from 10 to 20 characters in length. The first 9 characters are fixed in composition and length.

  • Vintage (4) + Type (1) + Schema (4) + Geographic Unique Identifier (2-11) :
  • VVVV T SSSS GGGGGGGGGGG
  • Vintage is a four digit code (e.g., 2021) indicating the reference year of the geospatial data.
  • Type is a one character code (e.g., A) indicating the type of geographic areas. At this time there are five geographic area types:
    • A Administrative areas
    • S Statistical areas
    • C Combined areas
    • B Blended areas
    • Z Other
  • Schema is a four digit sequential number (e.g., 0005) assigned to each unique geographic area defined by type.
  • Geographic Unique Identifier is a variable length alpha‑numeric code (e.g., 3520005) assigned to each individual geographic area. For more detail see the Geographic Code definition. The Geographic Unique Identifiers range from 1 to 12 characters in length.

ALT_GEO_CODE

alternate geographic code that is usually equal to the ending digits of the DGUID and is often the geographic code found in previous census cycle products.

SGC Code

Standard Geographical Classification (SGC) is Statistics Canada’s official classification for geographic areas in Canada, including all:

  • geographical regions of Canada
  • provinces and territories, census divisions (counties, regional county municipalities)
  • census subdivisions (municipalities)

The names and codes for census metropolitan areas, census agglomerations, census metropolitan influenced zones, economic regions, North and South, census agricultural regions and census consolidated subdivisions are shown as the variants of SGC 2021.

Each geographic area receives a unique numeric code ranging from 1 to 7 digits in 1 to 4 parts (XX YY ZZZ):

  • XX: Code which identifies the Region, County, or District where the municipality is located.
  • YY: Code which identifies the Municipalities status according to the following table:
  • ZZ: Represent a sequential ordering of Municipalities of the same status in the same Geographic region, county, or district.

Example

  • 35 represents Ontario
  • 18 represents Durham Region
  • 013 represents the City of Oshawa

More: Standard Geographical Classification (SGC) 2021

MAH Code

Municipal Affairs and Housing Code (MAH Code) which is associated with the municipality (also known as TEIGA (Treasury Economics
and Inter-Governmental Affairs) code). The code is unique over time. That is, even through status changes and new municipalities come into being as a result of amalgamations, previously used codes are retired, and never re-used. This code is used for structured sorts. It must be unique
within the Ministry of Municipal Affairs and Housings Municipal Analysis and Retrieval System (MARS) database. Because this code changes when the status of the municipality changes, it is not used as a unique identifier. This code is carried as a historical reference and to link to older
data systems.

The MAH Code is a five-digit code which is unique to each municipality in the province. The five-digit MAH Code is divided into three parts (XXYZZ):

  • First 2 digits (XX): Code which identifies the Region, County, or District where the municipality is located.
  • 3rd digit (Y): Code which identifies the Municipalities status according to the following table:
  • Last 2 digits (ZZ): Represent a sequential ordering of Municipalities of the same status in the same Geographic region, county, or district.

Example

27401 Town of Aurora (in York Region)

  • 27 Represents York Region
  • 4 Represents Town
  • 01 Identifies Aurora as Town 1 in the Region

Municipal Assessment Code

Municipal Assessment Code (ASMT Code) which is a four-digit code which is unique to each municipality in the province used by the Municipal Property Assessment Corporation (MPAC) to identify properties in the assessment roll.

A municipal code provided by the Municipal Property and Assessment Corporation (MPAC) (formerly Ministry of Revenue). It is also known as the Revenue Code. The four-digit code made up of two portions: the first two digits describe the geographic Upper Tier in which the municipality is located, the second pair of digits uniquely describe the Lower Tier Municipality within the geographic Upper Tier.

Since MPAC maintains assessment data only at the Lower Tier level, this code has been made-up for Upper Tier Municipalities in the Municipal Analysis and Retrieval System (MARS) data base. The code in MARS also had to be made-up for the new City of Toronto after the 1998 amalgamation, since MPAC continued to carry the codes of the former municipalities.

The first 4 digits of properties roll number begins with this code. It is split into 2 parts (XXYY):

  • First 2 digits: Identifies the Region, County, or District where the municipality is located.
  • Last 2 digits: Identifies each Municipality

Example

1946 Town of Aurora (in York Region)

  • 19 Represents York R
  • 46 Represents Aurora T

MSO Code

MSO Code is a 2 digit code to identify the Municipal Service Office.

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