Assessor - Neighborhood Boundaries

Neighborhood polygons used by the Cook County Assessor's Office for valuation and reporting. These neighborhoods are specific to the Assessor. They are intended to represent homogenous housing submarkets, NOT Chicago community areas or municipalities.

These neighborhoods were reconstructed from individual parcels using spatial buffering and simplification. The full transformation script can be found on <a href="https://github.com/ccao-data/data-architecture/blob/master/aws-s3/scripts-ccao-data-warehouse-us-east-1/spatial-ccao-neighborhood.R">the Assessor's GitHub</a>.

<a href="https://datacatalog.cookcountyil.gov/stories/s/9bqn-cfsv">Read about the Assessor's 2023 Open Data Refresh.</a>

Querying over HTTP

Splitgraph serves as an HTTP API that lets you run SQL queries directly on this data to power Web applications. For example:

curl https://data.splitgraph.com/sql/query/ddn \
    -H "Content-Type: application/json" \
    -d@-<<EOF
{"sql": "
    SELECT *
    FROM \"datacatalog-cookcountyil-gov/assessor-neighborhood-boundaries-pcdw-pxtg\".\"assessor_neighborhood_boundaries\"
    LIMIT 100 
"}
EOF

See the Splitgraph documentation for more information.