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26 Results
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Cook County 10-digit parcels with attached distances to various spatial features.
When working with 10-digit Parcel Index Numbers (PINs) make sure to zero-pad them to 10 digits. Some datasets may lose leading zeros for PINs when downloaded. 10-digit PINs do not identify individual condominium units.
Additional notes:
- Centroids are based on Cook County parcel shapefiles.
- Older properties may be missing coordinates and thus also missing attached spatial data (usually they are missing a parcel boundary in the shapefile).
- Attached spatial data does NOT all go back to 2000. It is only available for more recent years, primarily those after 2012.
- Data for the current tax year may not be complete or final. PINs can still be added and removed to the universe up until the Board of Review closes appeals.
- Data will be updated annually as new parcel shapefiles are made available.
- Rowcount and characteristics for a given year are final once the Assessor has certified the assessment roll for all townships.
For more information on the sourcing of attached data and the preparation of this dataset, see the Assessor's data architecture repo on GitLab.
Created
May 16 2023
Views
45
A brief outline of the changes users can expect from the Assessor's open data offerings.
Created
May 8 2023
Views
115
A complete, historic universe of Cook County parcels with attached geographic, governmental, and spatial data.
When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded.
Additional notes:
For more information on the sourcing of attached data and the preparation of this dataset, see the Assessor's data architecture repo on GitLab.
- Non-taxing district data is attached via spatial join (st_contains) to each parcel's centroid.
- Tax district data (school district, park district, municipality, etc.) are attached by a parcel's assigned tax code.
- Centroids are based on Cook County parcel shapefiles.
- Older properties may be missing coordinates and thus also missing attached spatial data (usually they are missing a parcel boundary in the shapefile).
- Newer properties may be missing a mailing or property address, as they need to be assigned one by the postal service.
- The universe contains data for the current tax year, which may not be complete or final. PINs can still be added and removed to the universe up until the Board of Review closes appeals.
- Data will be updated monthly.
- Rowcount and characteristics for a given year are final once the Assessor has certified the assessment roll for all townships.
- Depending on the time of year, some third-party and internal data will be missing for the most recent year. Assessments mailed this year represent values from last year, so this isn't an issue. By the time the Data Department models values for this year, those data will have populated.
- Current property class codes, their levels of assessment, and descriptions can be found on the Assessor's website. Note that class codes details can change across time.
- Due to decrepencies between the systems used by the Assessor and Clerk's offices, tax_district_code is not currently up-to-date in this table.
For more information on the sourcing of attached data and the preparation of this dataset, see the Assessor's data architecture repo on GitLab.
Created
May 1 2023
Views
74
Situs and mailing addresses of Cook County parcels. Used by the Assessor's office to mail assessment notices.
When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded.
Additional notes:
Read about the Assessor's 2023 Open Data Refresh.
- Mailing addresses can be out of date or fail to properly reflect deed transfers.
- Newer properties may be missing a mailing or property address, as they need to be assigned one by the postal service.
- The universe contains data for the current tax year, which may not be complete or final. PINs can still be added and removed to the universe up until the Board of Review closes appeals.
- Data will be updated monthly.
- Rowcount and characteristics for a given year are final once the Assessor has certified the assessment roll for all townships.
Read about the Assessor's 2023 Open Data Refresh.
Created
May 1 2023
Views
86
This is a preliminary version of a new open data asset and will change before the final version is published. Use accordingly.
Land, building, and total assessed values, pre and post-appeal with the Cook County Assessor’s office, for all Cook County parcels, from 1999 to present. The Assessor's Office uses these values for reporting, evaluating assessment performance over time, and research.
When working with Parcel Identification Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded.
This data is parcel-level. Each row contains the assessed values for a single PIN for a single year pre and post-appeal. Important notes:
- Each row includes two stages: 1) mailed, these are the initial assessed values (AVs) estimated by the Assessor's Office and mailed to taxpayers. The columns mailed_bldg, mailed_land, and mailed_tot are the AVs for the building, land, and total, at the mailed stage. 2) certified, these are values after the Assessor's Office closes appeals. The columns certified_bldg, certified_land, and certified_tot are the AVs for the building, land, and total, after the Assessor has completed appeal decisions.
- Values in this dataset are not final assessed values for a given year as they are still subject to change if a taxpayer appeals to the Cook County Board of Review. At present, this dataset does not contain appeal decisions from this final third stage. However, the final stage AVs and appeal decisions can be downloaded from the Board of Review Appeal Decision History dataset.
- Due to the current transition from the county's legacy system to a modern system of record, appeal data is sparse prior to 2021. Values and change/no change decisions are available, but the reason, agent, and type fields will only be complete once the new system has been successfully batch updated with complete historical data.
- The values in this data are assessed values, NOT market values. Assessed values must be adjusted by their level of assessment to arrive at market value. Note that levels of assessment have changed throughout the time period covered by this data set.
- This data set will be updated monthly regardless of the Assessor's mailing and certification schedule. There may be small discrepancies between the Assessor's site and this data set, as each pulls from a slightly different system. If you find a discrepancy, please email the Data Department using the contact link below.
- This data set contains data for the current tax year, which may not be complete or final. Rowcount and values for a given year are final once the Assessor has certified the assessment roll for all townships.
- Current property class codes, their levels of assessment, and descriptions can be found on the Assessor's website. Note that class codes details can change across time.
- Appeal reason codes can be matched to text descriptions using the attached crosswalk.
Created
March 26 2023
Views
581
A brief outline of the changes users can expect from the Assessor's open data offerings.
Created
May 3 2022
Views
4,395
Land, building, and total assessed values for all Cook County parcels, from 1999 to present. The Assessor's Office uses these values for reporting, evaluating assessment performance over time, and research.
When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded.
This data is parcel-level. Each row contains the assessed values for a single PIN for a single year. Important notes:
- Assessed values are available in three stages: 1) mailed, these are the initial values estimated by the Assessor's Office and mailed to taxpayers. 2) certified, these are values after the Assessor's Office closes appeals. 3) Board of Review certified, these are values after the Board of Review closes appeals.
- The values in this data are assessed values, NOT market values. Assessed values must be adjusted by their level of assessment to arrive at market value. Note that levels of assessment have changed throughout the time period covered by this data set.
- This data set will be updated roughly contemporaneously (monthly) with the Assessor's website as values are mailed and certified. However, note that there may be small discrepancies between the Assessor's site and this data set, as each pulls from a slightly different system. If you find a discrepancy, please email the Data Department using the contact link below.
- This data set contains data for the current tax year, which may not be complete or final. PINs can still be added and removed to the universe and values can change up until the Board of Review closes appeals.
- Rowcount and characteristics for a given year are final once the Assessor has certified the assessment roll for all townships. Values should be considered final once the Board of Review closes its appeals, though there are a few rare circumstances where values may change for the current or past years after that.
- Current property class codes, their levels of assessment, and descriptions can be found on the Assessor's website. Note that class codes details can change across time.
Created
April 29 2022
Views
5,183
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 the Assessor's GitLab.
Created
April 29 2022
Views
1,116
Residential condominium unit characteristics collected and maintained by the Assessor's office for all of Cook County, from 1999 to present. The office uses this data primarily for valuation, assessments, and reporting.
When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded.
This data is unit-level. Each 14-digit PIN represents one condominium unit. The first 10 digits of each PIN are the condominium building. Additional notes:
- The Assessor's Office has historically not tracked any internal, unit-level characteristics for condominiums, including square footage, number of bedrooms, etc. In 2021, the office began to manually compile unit-level data from a variety of sources. The ultimate intention is to gather basic data on all condominium units in the county.
- As such, unit square footage, building total square footage, and unit number of bedrooms are only available on a per-triad basis after 2021. Future data updates will add these features for other areas.
- Condominiums are assessed based on their percentage of ownership. See the link below for more information on how this process works. The percentage of ownership for all units in a building should sum to 1. However, this may not always be the case in this data, since it does not include commercial units.
- Condominium parcels can also be parking areas, storage units, or common areas. Identifying these units can be challenging, and they are not valued using mass appraisal. The Assessor's Office has an ongoing effort to clean up and identify these unit records.
- Current property class codes, their levels of assessment, and descriptions can be found on the Assessor's website. Note that class codes details can change across time.
- Data will be updated bi-weekly.
- Depending on the time of year, some third-party and internal data will be missing for the most recent year. Assessments mailed this year represent values from last year, so this isn't an issue. By the time the Data Department models values for this year, those data will have populated.
- Rowcount and characteristics for a given year are final once the Assessor has certified the assessment roll for all townships.
Township codes can be found in the legend of this map.
Created
April 25 2022
Views
1,304
Single and multi-family (less than 7 units) property characteristics collected and maintained by the Assessor's Office for all of Cook County, from 1999 to present. The office uses this data primarily for valuation, assessments, and reporting.
When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded.
Current property class codes, their levels of assessment, and descriptions can be found on the Assessor's website. Note that class codes details can change across time.
This data is improvement-level - 'improvements' are individual buildings on a parcel. Each row in a given year corresponds to a building e.g. two rows for the same parcel in one year means a parcel has more than one building.
Data will be updated bi-weekly. Rowcount and characteristics for a given year are final once the Assessor has certified the assessment roll for the all townships.
Depending on the time of year, some third-party and internal data will be missing for the most recent year. Assessments mailed this year represent values from last year, so this isn't an issue. By the time the Data Department models values for this year, those data will have populated.
NOTE: The Assessor's Office has recently changed the way Home Improvement Exemptions (HIEs) are tracked in its data. HIEs "freeze" a property's characteristics for a period of time with the intention of encouraging owners to improve their property without fear of assessment increases.
Historically, the updated, "improved" characteristics were saved in a separate file. However, in more recent years, the improved characteristics are saved in the main characteristics file. As such, the records in this data set from before 2021 do NOT include HIE characteristic updates, while those after and including 2021 DO include those updates.
For more information on HIEs, see the Assessor's Data Department wiki.
For more information on how this data is used to estimate property values, see the Assessor's residential modeling code on GitLab.
Township codes can be found in the legend of this map.
Created
April 19 2022
Views
2,220
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