NoteRow counts and load dates are those in our database on 15 Sep 2026. Every source listed here is loaded.
CivicDelta / Method / Sources
Sources

Every dataset we use, and who publishes it

Every figure on this site comes from one of the 25 official datasets below, published by 5 agencies: 10 for property, 13 for health and care, and 2 for California contractors — 82,625,662 rows in all. Each row here names the publisher, the dataset or file, how many records we hold, the day we last loaded it and how often we check for a new release, so you can go to the source and check us.

How each load is checked before it is published · where each report works · corrections

Property · 10 datasets

Cook County and City of Chicago, 26,491,889 rows

Loaded from each publisher’s Socrata API. Before a load, we ask the publisher how many records to expect; a load that doesn’t match is blocked.

Scroll the tables sideways for refresh, terms and use.

DatasetPublisherDataset IDYears keptRows publishedLast loadedRefresh dueTermsUsed by
Parcel universe (current year)Cook County Assessorpabr-t5kh20261,863,66513 Sep 2026Every 30 daysReview pendingTax Appeal, Permits
Parcel addressesCook County Assessor3723-97qp2025–20263,727,47313 Sep 2026Every 30 daysReview pendingTax Appeal, Permits
Assessed valuesCook County Assessoruzyt-m5572023–20267,455,73413 Sep 2026Every 7 daysReview pendingTax Appeal
Residential characteristicsCook County Assessorx54s-btds2023–20264,409,60714 Sep 2026Every 30 daysReview pendingTax Appeal, Permits
Condominium characteristicsCook County Assessor3r7i-mrz42023–20261,829,21314 Sep 2026Every 30 daysReview pendingTax Appeal
Parcel salesCook County Assessorwvhk-k5uv2015–20261,210,85614 Sep 2026Every 30 daysReview pendingTax Appeal
Assessor appealsCook County Assessory282-6ig32023–20261,150,10614 Sep 2026Every 30 daysReview pendingTax Appeal
Appeal decision historyCook County Board of Review7pny-nedm2022–20251,970,28614 Sep 2026Every 60 daysReview pendingTax Appeal
Building permitsCity of Chicago Department of Buildingsydr8-5enuAll847,14115 Sep 2026DailyReview pendingPermits
Building violationsCity of Chicago Department of Buildings22u3-xenrAll2,027,80815 Sep 2026DailyReview pendingPermits
Total, 10 datasets26,491,889
Health & Care · 13 datasets

Nursing homes and surgeons, all US states, 55,639,978 rows

Published by the Centers for Medicare & Medicaid Services (CMS) as bulk files. CMS’s websites refuse our network, so each file is downloaded by a separate automated job or by hand, its fingerprint recorded, and loaded with its row count checked. A newer release is loaded only when a new file is fetched.

DatasetPublisherFile or dataset IDRows publishedLast loadedRefresh dueTermsUsed by
Nursing home provider informationCMS Provider Data CatalogNH_ProviderInfo_Aug2026.csv14,69014 Sep 2026Every 35 daysReview pendingNursing Home
Nursing home health deficienciesCMS Provider Data CatalogNH_HealthCitations_Aug2026.csv419,47914 Sep 2026Every 35 daysReview pendingNursing Home
Nursing home fire safety deficienciesCMS Provider Data CatalogNH_FireSafetyCitations_Aug2026.csv200,32714 Sep 2026Every 35 daysReview pendingNursing Home
Nursing home penaltiesCMS Provider Data CatalogNH_Penalties_Aug2026.csv15,69614 Sep 2026Every 35 daysReview pendingNursing Home
Nursing home ownershipCMS Provider Data CatalogNH_Ownership_Aug2026.csv249,45214 Sep 2026Every 35 daysReview pendingNursing Home
Nursing home inspection datesCMS Provider Data CatalogNH_SurveyDates_Aug2026.csv149,98514 Sep 2026Every 35 daysReview pendingNursing Home
Nursing home citation code look-upCMS Provider Data CatalogNH_CitationDescriptions_Aug2026.csv64314 Sep 2026Every 35 daysReview pendingNursing Home
Medicare Physician & Other Practitioners, by Provider and Service, 2024CMS92396110-2aed-4d63-a6a2-5d6207d46a299,781,67314 Sep 2026Every 365 daysReview pendingSurgeon
NPI Registry, monthly full replacement file (V2)CMS, NPPESNPPES_Data_Dissemination (Aug 2026, V2)9,726,86514 Sep 2026Every 35 daysReview pendingSurgeon
Open Payments general payments, 2024–2025CMS, Open Paymentse6b17c6a-2534-4207-a4a1-6746a14911ff, fb0b1734-1410-429d-92f6-3f4b35218e5e31,630,54314 Sep 2026Every 180 daysReview pendingSurgeon
Open Payments research payments, 2024–2025CMS, Open Payments2f15cb85-8887-4dcc-a318-1f8ec1d815b3, f0d1de67-6852-4093-a036-c9328c256a051,749,17414 Sep 2026Every 180 daysReview pendingSurgeon
Open Payments ownership and investment interests, 2024–2025CMS, Open Payments9ac4f7f8-b6e4-4d80-8410-4aba7e71dd02, 800aed1b-20ed-4d19-b0c9-dcd10f197ffc7,48014 Sep 2026Every 180 daysReview pendingSurgeon
Open Payments covered recipient profilesCMS, Open Payments6ed6ae76-2999-49da-b0b2-d7df150ac7541,693,97114 Sep 2026Every 180 daysReview pendingSurgeon
Total, 13 datasets55,639,978
Hiring & Education · 2 datasets

California contractor licenses, 493,795 rows

The Contractors State License Board’s master list, downloaded in a browser from its data portal (the portal refuses automated downloads, and we don’t work around that), fingerprinted and loaded with its row count checked. The license list covers current and renewable licenses only.

DatasetPublisherFileRows publishedLast loadedRefresh dueTermsUsed by
Master list: license masterCalifornia Contractors State License BoardMasterLicenseData.csv243,92114 Sep 2026Every 90 daysReview pendingContractor
Master list: workers’ compensationCalifornia Contractors State License BoardWorkerCompData.csv249,87414 Sep 2026Every 90 daysReview pendingContractor
Total, 2 datasets493,795

“Review pending”: a person has not yet recorded a review of this publisher’s terms of use. “Refresh due” is how often we check for a new release; files downloaded by hand or by a separate job are refreshed only when a new file is fetched. Land Well & Septic and Condo Assessment Risk query state, federal and county services for each order instead of a stored dataset; each report lists those sources.

City of Chicago data notice

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.

Cook County data notice

Cook County data is provided by Cook County on an “as is” basis. Cook County does not endorse CivicDelta or any report built from its data, and CivicDelta is not affiliated with Cook County, the Cook County Assessor’s Office or the Board of Review.