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@ccao-data

Cook County Assessor's Office

The CCAO's Data Department creates models, tools, and analyses to improve Cook County's property tax system

Hi there! 👋

We're the Cook County Assessor's Data Department. We make predictive models to help determine the assessed value of every residential and condominium property in Cook County. We also make tools and reports to make the Cook County property system more transparent, predictable, and fair.

Our work

Our tiny team has done some big work since 2018. Here are some of the things we're most proud of:

Get involved

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  1. model-res-avm Public

    Automated valuation model for all class 200 residential properties in Cook County (except vacant land and condos)

    R 43 9

  2. data-architecture Public

    Codebase for CCAO data infrastructure construction and management

    R 6 4

  3. model-condo-avm Public

    Automated valuation model for all class 299 and 399 residential condominiums in Cook County

    R 10 4

  4. ptaxsim Public

    R package for estimating Cook County property tax bills

    R 16 3

  5. model-sales-val Public

    Heuristics for detecting outlier and non-arms-length sales

    Python 2 1

  6. wiki Public

    Handbook, how-tos, and other documentation

    HTML 5 1

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