How the HCDSB school attendance areas on realestatewolf.ca/whats-nearby are made Source: Halton Catholic District School Board (HCDSB), school attendance boundaries, ArcGIS Online layer https://services1.arcgis.com/Z2ZyXpStrYRDJ1cf/arcgis/rest/services/All_Boundaries/FeatureServer/0 School year: 2026-27 only (the layer's YEAR = '2026-2027'; its other years, 2025-2026 and 2027-2028, are not used). Layer last edited: 2026-11-02T18:53:32.330Z Fetched: 2026-11-02T21:41:09.884Z Shown with HCDSB's permission: HCDSB Planning Services, 2026-11-02. HCDSB has no concerns with the site showing its publicly available school attendance boundary information on the free “What’s near this home?” tool as described in the request: HCDSB identified as the source, the school year shown, and families directed to HCDSB’s official resources (Find Your School) to verify an address. School boundaries and attendance arrangements may change; HCDSB does not guarantee the information as presented here and accepts no responsibility for its use. School boundaries and attendance arrangements can change, and HCDSB does not guarantee this copy of its boundary information. Confirm any address with HCDSB. Confirm any address with HCDSB Find Your School: https://schoolplanning.hcdsb.org/find-your-school/ Features: 680 (one per school, program and grade): elementary-RT: 480 elementary-FI: 54 elementary-ExF: 40 secondary-RT: 40 secondary-FI: 16 secondary-ExF: 27 secondary-AP: 23 Coordinates rounded to 6 decimals (at most 0.11 m); outlines that are identical after rounding are stored once: 98 different source outlines, 88 areas (the outlines merged by rounding differed by at most 9.0e-10 degrees, floating-point noise). Rings smaller than 10 m² were dropped as digitizing slivers (42 rings on 42 features): hole of 0.94 m² at 43.49718, -79.75874: St. Marguerite d'Youville CES elementary-ExF (grades 5,6,7,8); Holy Trinity CSS secondary-AP (grades 9,10,11,12) part of 0.94 m² at 43.49718, -79.75874: Holy Trinity CSS secondary-ExF (grades 9,10,11,12); St. Marguerite d'Youville CES elementary-FI (grades 1,2,3,4,5,6) hole of 0.00 m² at 43.66171, -79.93105: Holy Cross CES elementary-RT (grades K1,K2,1,2,3,4,5,6,7,8) hole of 0.86 m² at 43.49717, -79.75875: St. Gregory the Great CES elementary-RT (grades K1,K2,1,2,3,4,5,6,7,8) hole of 2.62 m² at 43.44063, -79.66806: St. Thomas Aquinas CSS secondary-RT (grades 9,10,11,12) Schools and programs whose areas differ by grade (6): St. Mary CES elementary-FI: 1,2,3,4,5,6 | 7,8 St. Peter CES elementary-FI: 1,2,3,4,5 | 6 St. Scholastica CES elementary-FI: 1,2,3,4,5 | 6 | 7,8 Lumen Christi CES elementary-ExF: 5,7 | 6,8 Bishop P. F. Reding CSS secondary-ExF: 9,10,11 | 12 Bishop P. F. Reding CSS secondary-AP: 9,10,11 | 12 Schools: 58, linked to the Ontario school list (schools.json) by name and checked by address (src/lib/schools/hcdsb-match.ts): 57 by name, 1 by table: Bishop P. F. Reding CSS -> 689726: The province lists it under its full name, Bishop Paul Francis Reding Catholic Secondary School; same address (1120 Main St E, Milton). Address variants reviewed by hand: St. Mary CES|2145 Upper Middle Road, Burlington, L7P 4G1: HCDSB's French Immersion rows for St. Mary CES carry St. Mark CES's address and website (Burlington), while its Regular Track rows carry St. Mary's own (2175 Colonel William Parkway, Oakville). The French Immersion areas are in Oakville (bbox 43.371..43.528 N, 79.625..79.811 W) and contain St. Mary's own position; St. Mark CES has no French Immersion rows. Treated as a copy error in the address field: matched to St. Mary (681423), shown with the Oakville address. HCDSB schools in the Ontario list with no 2026-27 area: none Schools in the layer that are not in the Ontario list: none Listed school positions outside their own Regular Track area: none HCDSB's notes kept verbatim (they apply to 2026-27): St. Marguerite d'Youville CES elementary-ExF (NOTES, grades 5): For the 2026-2027 school year Extended French will be offered at Our Lady of Peace CES. St. Kateri Tekakwitha CSS secondary-AP (Status, grades 9,10,11): A new grade will be added at the new location each year. Left out: (Status, N/A): N/A on 9 school programs (Status, names another year (2024, 2025)): Starting in the 2024-2025 school year, French Immersion will be phased in to St. Kateri Tekakwitha CSS. Grade 9 FI is offered in the 2024-2025 school year. Each year, a new grade will be added to St. Kateri Tekakwitha CSS until the full Grade 9-12 FI on St. Kateri Tekakwitha CSS secondary-FI (cross3, names another year (2025)): Cross Boundary status will be determined in 2025 on 46 school programs (cross3, names another year (2024)): Cross Boundary status will be determined in 2024 on St. Benedict CES elementary-RT; St. Gregory the Great CES elementary-RT (Status, names another year (2024, 2025)): For the 2024-2025 school year, students have the option to attend Assumption CSS or Corpus Christ CSS for grades 9-10 pre-AP. A grade will be added to Corpus Christi CSS each year. on Corpus Christi CSS secondary-AP; Assumption CSS secondary-AP HCDSB's PDF map links (MAPB, Map2) are not used: uploads from 2021 to 2023 with no school year on them. Address look-ups use the exact outlines on the server. A point within 0.5 m of an area's edge counts as inside it, so a point on a line shared by two areas gets both. Each answer gives the distance to the nearest edge. Maps: each map's box is the area's box grown by 8 percent of its largest side (250 m to 1.5 km). The area's outline is simplified (Douglas-Peucker) at one CSS pixel when that box is drawn 800 pixels wide (its largest side / 800), kept between 1.5 and 5 m (3.2 to 5 m in this snapshot). Streets: © OpenStreetMap contributors, ODbL 1.0 (https://www.openstreetmap.org/copyright), one Overpass query, data as of 2026-11-02T21:31:37Z: ways tagged highway=motorway, trunk, primary, secondary, tertiary, unclassified, residential, living_street; ways of the same class and name that meet end to end are joined, then clipped to the box and simplified at the same pixel (not capped). Residential, unclassified and living-street roads are left out when the box is larger than 60 km², tertiary roads when it is larger than 250 km². Names are kept for tertiary and larger roads (name, or ref when unnamed).