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Every reported incident of crime in Chicago since 2001, geocoded to the block, with arrest and domestic flags.

Every police-reported traffic crash in the city — conditions, cause, injuries, and hit-and-run flags.

Every arrest by the Chicago Police Department since 2014, with up to four charges per arrest and the arrestee's race.

The lookup table behind every crime record: each four-character IUCR code with its primary and secondary description.

One row per victim of a homicide (since 1991) or non-fatal shooting (since 2010), the city's authoritative count of gun violence, with age, sex, race and location.

The Chicago Police Department's current sex offender registry, by block. Addresses are generalized to the hundred-block.

Every Chicago Police district station and headquarters, with address, phone and location.

Every Chicago Fire Department firehouse by engine company, with its address.

Deaths investigated by the Cook County Medical Examiner since 2014: when and where, the manner and cause of death, and flags for gun, opioid, heat, cold and traffic-related deaths. No names are published.

Sentences handed down in felony cases prosecuted by the Cook County State's Attorney: the charge, the sentence type and length, the judge and courthouse.

How every charge in felony cases prosecuted by the Cook County State's Attorney ended: guilty plea, trial verdict, dropped (nolle) or dismissed, with judge and courthouse.

Permits issued by the Department of Buildings since 2006 — new construction, renovation, demolition, electrical, and more, with reported costs.

Violations cited by the Department of Buildings during inspections — code, status, and inspector comments.

City-supported affordable rental developments — property type, management company, and unit counts.

Administrative-hearing violations for vacant and abandoned buildings, with fines and dispositions.

Every recorded property sale in Cook County — PIN, price, deed type, buyer and seller names.

Every parcel the city owns, has owned, or leases: status, zoning, land value, and whether it's for sale (including Large Lots and side-yard programs).

Building-code cases heard at the Department of Administrative Hearings: the violation, the respondent, the outcome and the fine imposed.

Owners the city has named as building-code scofflaws for serious, unresolved violations, and the buildings that put them on the list.

Rental buildings that went through foreclosure, registered under the Keep Chicago Renting ordinance, with the new owner and the agent tenants should contact.

Every short-term rental (Airbnb, Vrbo) unit currently registered with the city, with host and expiration.

Buildings whose condo boards or owners have banned short-term rentals, filed with the city.

Ward precincts where City Council has restricted or banned new short-term rental licenses.

Annual energy and water use, ENERGY STAR score, emissions and Chicago Energy Rating (0–4 stars) for every large building required to report.

The buildings (over 50,000 sq ft) required to report energy use, with sector, size cohort and verification year.

Building code complaints, administrative hearings and court cases on properties inside the city's Micro-Market Recovery target zones, with status and next court date.

Every building inspection, and the code violations it found, on properties inside the city's Micro-Market Recovery target zones.

Applications to add a coach house or a basement or attic apartment to an existing home, with the address, zoning, how many units were requested and whether the city pre-certified it.

The property address, taxpayer mailing address and owner of every Cook County parcel, one row per PIN per year since 1999. This is how you get from a street address to a PIN.

Every Cook County parcel this year with its location and the districts it sits in: coordinates, Chicago ward and community area, TIF, school and park districts, flood zone.

The assessed value of every Cook County parcel, every year since 1999, at each stage: the assessor's first-pass mailed value, the certified value after assessor appeals, and the final Board of Review value.

What the assessor knows about each house and two-to-six flat in Cook County: year built, square footage, bedrooms, baths, construction, basement, garage and more, every year since 1999.

Every condo unit in Cook County with its building's year built and size, the unit's square footage, bedrooms and baths, and whether it's really a parking space or common area.

Every appeal filed with the Cook County Assessor since 1999: the value before and after, whether it changed, why, and the attorney or agent who filed it.

Every appeal decided by the Cook County Board of Review since tax year 2010: the assessor's value, the Board's value, whether it went down, and who filed it.

Building permits from every Cook County municipality as the assessor receives them, used to decide whether new work adds taxable value.

Parcels that pay no property tax — government, churches, schools, hospitals and other nonprofits — with the owner and address, since 2022.

Every business license issued by BACP — one row per license term, including liquor, retail food, and public-way endorsements.

The people and entities behind every licensed business: officers, members and sole proprietors, with their titles.

Every permit for outdoor restaurant seating on the sidewalk since 2001: which restaurant, where, and for which season.

Businesses currently registered with the Department of Finance to pay or collect a city tax, such as the restaurant, hotel, parking, amusement or ride-hail tax.

Every 311 request since the December 2018 system launch — potholes, rodents, graffiti, abandoned vehicles, and 100+ other types.

Vehicles towed or relocated by the City in the last 90 days — the dataset behind 'was my car towed'.

Name, title, department, and pay for every current City of Chicago employee (~32,000 people).

Contracts and purchase orders awarded by the City — vendor, department, amount, and links to contract PDFs.

Every check the city has written to a vendor: who got paid, how much, by which department, and under which contract.

The 2026 budget as adopted by City Council: every appropriation by department, fund and line item.

The mayor's proposed 2026 budget, line by line, next to the 2025 appropriation and its mid-year revision.

Where the city expects its 2026 money to come from, as adopted: taxes, fees, fines, grants and transfers by fund.

The mayor's proposed 2026 revenue estimates by source and fund, before Council amendments.

Every position the 2026 budget funds: title, department, bargaining unit, head count and budgeted pay rate.

Redevelopment and intergovernmental agreements paid for with Tax Increment Financing: developer, TIF district, approved subsidy, total cost and affordable units.

What each TIF district spent from its special tax allocation fund each year, broken out by statutory category (public works, site prep, housing, financing, schools).

TIF-funded grants to small businesses and landlords for building improvements: who got them, where, how much, and the jobs promised.

A monthly snapshot of every budgeted city job title: how many positions exist, how many people fill them, and how many sit empty, by department.

How much of Chicago's federal pandemic-recovery (ARPA) money each program was allocated, has committed, and has actually spent.

Every program the city funded with its federal pandemic-recovery (ARPA) money: what it is, which department runs it, and which recovery goal it serves.

Home loans, refinancings and denials that banks holding city deposits must report, by census tract, with loan size, applicant race and sex, and denial reasons.

Grants of up to $250,000 from downtown development fees to small businesses on neighborhood commercial corridors, with the project, cost and location.

The city's 10-year forecast for every TIF district: expected tax revenue, committed and proposed spending, transfers, and surplus, year by year through 2034.

Each TIF district's books for each year since 2017: tax money collected, what was spent, surplus returned to schools and other taxing bodies, and the balance left over.

Contracts Cook County has awarded and amended: the vendor, the amount, the department, and the term.

Every check Cook County has written to a vendor: who got paid, how much, and when.

System-wide CTA boardings by day — bus and rail — back to 2001.

Daily violation counts for every speed camera in the city.

Daily violation counts for every red-light camera intersection.

Live status of every Divvy bike-share station — docks in service and availability.

Everyone involved in a reported crash (drivers, passengers, pedestrians, cyclists) with age, injury severity, safety equipment and driver action.

Every vehicle (and pedestrian or cyclist 'unit') in a reported crash: make, model, year, maneuver, defects, and commercial carrier details.

Cars the city moved (not towed to a pound) for street work, festivals or tree trimming, with where they were taken from and where they were left.

The 2026 sweeping calendar: which days each ward section is swept, April through November. Cars left on the street get ticketed.

Which street segments require a residential parking permit, by address range and odd/even side.

Where every speed camera is, which directions it watches, and when it went live.

Every Uber, Lyft and Via trip in Chicago since January 2025: time, distance, fare, tip and pickup and dropoff community areas.

Every person killed in a traffic crash in Chicago that counts toward the city's Vision Zero statistics, since 2019: who they were (driver, pedestrian, cyclist) and where it happened.

How many people entered each 'L' station every day since 2001, counting every turnstile at the station.

How many people rode each CTA bus route every day since 2001.

Every place an 'L' train stops: station and platform names, which lines serve it, and whether it's wheelchair accessible.

Where every red light camera is, which direction of traffic it watches, and when it went live.

Every licensed taxi trip in Chicago since January 2024: time, distance, fare, tip, payment type, cab company, and pickup and dropoff community areas.

Every shared e-scooter trip (Lime, Lyft, and earlier vendors) since the city's ongoing program began in May 2022: when, how far, how long, and between which community areas.

Every block where city crews patched potholes since 2019, with when it was reported, when it was fixed, and how many holes were filled.

Permits to use or block the public way: street and sidewalk openings, dumpsters, moving vans, block parties, filming, festivals, oversize trucks and more, with where, when and the street closure involved.

Streets that were recently repaved or rebuilt and are protected from being dug up again, by block range, with the date the protection expires.

City-installed bike racks and corrals since 2015, with address, the business or place they serve, and how many.

Every segment of Chicago's bike network (protected and buffered lanes, painted lanes, neighborhood greenways, shared lanes) by street and cross streets.

How many vehicles passed each camera-monitored street segment each day, by direction, since mid-2022, counted by the city's traffic and speed cameras.

Every 811 Chicago request to dig in the public way, and each utility's response to mark (or clear) its lines before the digging starts.

Estimated average traffic speed in each of 29 city traffic regions, about every ten minutes from March 2018 to April 2026.

Every recorded sale of a Chicago taxi medallion since 2007: the price, the seller and the buyer. A good record of the medallion market's rise and collapse.

Everyone licensed (now or in the past) to drive a taxi, livery car or pedicab in Chicago, with license status and type.

Every licensed for-hire vehicle: taxis (medallions), liveries, ambulances, medicars, sightseeing buses, pedicabs and horse carriages, with make, model, owner and taxi affiliation.

Health inspections of restaurants and food establishments since 2010, with risk level, pass/fail result, and violation detail.

Weekly results from CDPH's mosquito traps since 2007: how many mosquitoes were caught, what species, and whether the batch tested positive for West Nile virus.

Places to get out of the cold in winter: city community service centers plus libraries, park fieldhouses, police stations and senior centers that open as warming sites.

Air-conditioned places to escape summer heat: community service centers, libraries, park facilities and spray features, police stations and City Colleges.

A weekly 1-to-10 flu activity score for each Chicago ZIP code, based on how many ER visits are for flu-like illness compared with summer.

Weekly levels of COVID-19, flu A and B, and RSV in Chicago sewage at seven sampling sites — an early warning that often moves before cases do.

The weekly share of Chicago ER visits and hospital admissions due to flu, COVID-19, RSV and other respiratory illness, by age and race/ethnicity.

Public alerts from the Chicago Health Alert Network: outbreak notices, disease guidance for doctors, vaccine updates and emergency advisories.

Public health clinics run by or with CDPH — WIC nutrition sites, mental health centers and STI clinics — with hours, phones and services.

The city's regional and satellite senior centers run by Family & Support Services, with addresses, hours and phone numbers.

The six Family & Support Services community service centers, where residents can walk in for city social services.

Lobbyists registered with the Board of Ethics, by year, with their employers.

Every police misconduct complaint handled by the Civilian Office of Police Accountability or CPD internal affairs since 2000: category, status and finding.

One row per complainant or subject in a COPA or internal affairs case, with their race, sex and age band.

One row per officer involved in a COPA or internal affairs case, with demographics and years on the force. Officers are not named.

Cases investigated by CPD's Bureau of Internal Affairs, one row per involved officer, with final category and finding.

Quarterly disclosures of who lobbied which city department, for which client, and what they were after (zoning, permits, contracts, ordinances).

What each client paid each lobbyist, by quarter.

Political contributions lobbyists report making, usually to aldermanic and mayoral campaign committees.

Gifts lobbyists report giving to city officials and employees, with the recipient, their title and the value.

Every company and organization that has hired a registered city lobbyist, by year, with its address.

Reimbursements the city has paid its own employees since 2025 (tuition, boots, travel, licenses) by payee and department.

How many employees in each department owe the city money (unpaid tickets, water bills, taxes) and how much, reported each pay period.

Companies and people the city has banned from doing business with it, mostly for fraud, including fraud in the minority- and women-owned business program. Shows when each ban started and why.

Mileage the city has reimbursed its employees through their paychecks since 2005, by employee, job title and department.

The firms and organizations that employ Chicago's registered lobbyists, by registration year, with their addresses.

Money lobbyists reported spending while lobbying the city, $250 and up: filing fees, travel, meals, and payments to others, with the client and the matter.

Complaints about air pollution, noise, illegal dumping, odors and toxic materials, and how the Department of Public Health resolved them.

Air quality, solid waste, demolition and asbestos inspections of sites across the city, with results.

Air pollution control permits, storage tank installs and removals, and other environmental permits, by site and applicant.

Advance notice that asbestos abatement or a demolition is about to start at a site: who's doing it and when.

Tickets and hearing cases for environmental code violations, with respondent, code section and fine.

Daily average fine-particle pollution (PM2.5) and nitrogen dioxide from nearly 300 neighborhood air sensors installed across the city in 2025.

EV chargers and stations selling E85, biodiesel, propane and natural gas across the Chicago region, with charger counts, networks and access hours.

Population, household income bands, age and sex, and race and ethnicity for all 77 community areas, from the American Community Survey.

Every CPS school for the 2025–26 year, elementary or high school, with its address.

The neighborhood elementary school attendance zones: which school a home is zoned for and the grades it serves.

The neighborhood high school attendance zones for 2025–26.

The CPS report card for every school: type, test-score rating, school culture and safety survey results, attendance, and for high schools graduation, freshman on-track and college enrollment rates.

Every alderperson with their ward office address, phone, email and City Hall office, for all 50 wards.

Hourly lake water temperature, cloudiness (turbidity) and wave height from sensor buoys off Chicago beaches.

Lab tests of bacteria in the water at Chicago's beaches, used to decide when to raise a swim advisory: rapid DNA tests since 2015 and older E. coli cultures back to 2006.

Hourly air temperature, humidity, rain, wind and sunshine from Park District weather stations on the lakefront.

Upcoming Park District classes, sports leagues, camps and free events at parks across the city, with dates, ages, fees and registration.

Permits and reservations for using park space since 2012: festivals, races, picnics, sports training, photo shoots and corporate events, including ones booked for the months ahead.

Big events the city plans traffic and safety around — games, concerts, conventions, parades, festivals and block parties — by date and venue.

Upcoming story times, book clubs, classes, film screenings and more at Chicago Public Library branches, with audience, language and registration details.

Every Chicago Public Library location with its address, usual hours, phone and email.

How many people walked into each Chicago Public Library branch each month in 2026.

How many items each Chicago Public Library branch checked out each month in 2026, plus online renewals and downloads.

Outdoor murals registered with the city: artist, title, year, where to find them and who commissioned them.

Buildings and structures officially designated Chicago Landmarks, with the architect, when they were built and when they were protected.

About 9,300 pre-1940 buildings the city's 1983–95 survey rated historically or architecturally significant. Demolishing one triggers a review delay.

Freedom of Information Act requests received by the Department of Finance: who asked, for what, and when.

Freedom of Information Act requests received by Business Affairs & Consumer Protection: who asked, for what, and when.

Freedom of Information Act requests received by Planning and Development: who asked, for what, and when.

Freedom of Information Act requests received by the Department of Public Health: who asked, for what, and when.

Freedom of Information Act requests received by the City Clerk: who asked, for what, and when.

Freedom of Information Act requests received by the Department of Human Resources: who asked, for what, and when.

Freedom of Information Act requests received by the Department of Housing: who asked, for what, and when.

Freedom of Information Act requests received by the Board of Ethics: who asked, for what, and when.

Freedom of Information Act requests received by the Public Building Commission: who asked, for what, and when.

Freedom of Information Act requests received by Cultural Affairs & Special Events: who asked, for what, and when.

Freedom of Information Act requests received by the Chicago Police Department: who asked, for what, and when.

Freedom of Information Act requests received by Procurement Services: who asked, for what, and when.

Freedom of Information Act requests received by the Department of Water Management: who asked, for what, and when.

Freedom of Information Act requests received by the Chicago Public Library: who asked, for what, and when.

Freedom of Information Act requests received by the Chicago Department of Transportation: who asked, for what, and when.