Boundary data sources

Chicago community areas

Community-area boundaries are provided by the City of Chicago Data Portal, accessed 7 October 2026. They are used to check whether listings fall within an area. See the City's data terms of use.

This site provides applications using data that has been modified for use from its original source, www.cityofchicago.org, the official website of the City of Chicago. The City of Chicago makes no claims as to the content, accuracy, timeliness, or completeness of any of the data provided at this site. The data provided at this site is subject to change at any time. It is understood that the data provided at this site is being used at one's own risk.

Philadelphia neighbourhoods

Neighbourhood boundaries are derived from Robert Cheetham / OpenDataPhilly, data updated 24 April 2024, accessed 7 October 2026, under CC BY 4.0. This is a curated, non-official source. Reviewed polygons are converted to the database geometry format while preserving existing neighbourhood definitions.

Houston super neighbourhoods

Boundaries are provided by the City of Houston Planning and Development Department, accessed 7 October 2026. The data are in the public domain. The City provides GIS data for general reference and does not warrant accuracy, completeness or suitability for legal, engineering or surveying use. Reviewed polygons are converted to the database geometry format.

San Diego neighbourhoods

Boundaries are provided by City of San Diego Police / SanGIS, updated 6 October 2026, accessed 7 October 2026, under ODC Public Domain Dedication and Licence. These are police reference neighbourhoods and do not represent legal community boundaries. Reviewed polygons are converted to the database geometry format; fragments sharing the same source identifier are combined where required to preserve the existing neighbourhood definition.