Data Catalog

• County

  Traffic Violations

  Montgomery County of Maryland —

  This dataset contains traffic violation information from all electronic traffic violations issued in the County. Any information that can be used to uniquely identify...

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  Redlining Maps from the Home Owners Loan Corporation, 1937

  Allegheny County / City of Pittsburgh / Western PA Regional Data Center —

  Most of the text in this description originally appeared on the Mapping Inequality Website. Robert K. Nelson, LaDale Winling, Richard Marciano, Nathan Connolly, et...

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  • 20 more in dataset
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  Pittsburgh American Community Survey 2014 - Miscellaneous Data

  Allegheny County / City of Pittsburgh / Western PA Regional Data Center —

  Miscellaneous Reports from the 2014 American Community Survey Report

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  • 14 more in dataset
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  Autonomous Vehicle Survey of Bicyclists and Pedestrians in Pittsburgh

  Allegheny County / City of Pittsburgh / Western PA Regional Data Center —

  In Pittsburgh, Autonomous Vehicle (AV) companies have been testing autonomous vehicles since September 2016. However, the tech is new, and there have been some high-...

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• County

  Allegheny County Election Results

  Allegheny County / City of Pittsburgh / Western PA Regional Data Center —

  Official, certified results of primary, general, and special elections held in Allegheny County. (Note that the most recent results may not yet be certified. Please...

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  • 44 more in dataset
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  Housing Code Violations

  Montgomery County of Maryland —

  Housing Code Enforcement data from 2013 to the present , including violations identified. Update Frequency: Weekly

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• County

  Marine Benthic Abundance Data

  King County, Washington —

  This dataset contains Puget Sound benthic abundance data. Before accessing data please download the README file. King County monitors the community of animals that...

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• County

  Allegheny County Map Index Grid

  Allegheny County / City of Pittsburgh / Western PA Regional Data Center —

  Map Index Sheets from Block and Lot Grid of Property Assessment and based on aerial photography, showing 1983 datum with solid line and NAD 27 with 5 second grid...

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  Allegheny County Property Sale Transactions

  Allegheny County / City of Pittsburgh / Western PA Regional Data Center —

  This dataset contains data on all Real Property parcels that have sold since 2013 in Allegheny County, PA. Before doing any market analysis on property sales, check...

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• County

  Assessor - Commercial Valuation Data

  Cook County of Illinois —

  Commercial valuation data collected and maintained by the Cook County Assessor's Office, from 2021 to present. The office uses this data primarily for valuation and...

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• County

  Marine Phytoplankton Grouped by Sample and Specific Functional Group

  King County, Washington —

  This dataset contains phytoplankton samples collected from Puget Sound and analyzed using a particle imaging analyzer (FlowCAM®). For more information see the King...

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  Municipal Boundaries

  Lake County, Illinois —

  Download In State Plane Projection Here. Municipal boundaries are based on annexations, court orders and other legal documents filed in the office of the Recorder of...

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  • 5 more in dataset
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  Housing - Average Apartment Rent

  Arlington County, VA —

  The Arlington Profile combines countywide data sources and provides a comprehensive outlook of the most current data on population, housing, employment, development,...

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  Housing Licensing and Registration

  Montgomery County of Maryland —

  Rental license tracking for condominiums, single-family homes, multi-family units and accessory apartments under Montgomery County Code, Chapter 29, Landlord-Tenant...

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• County

  Crime Reports

  Loudoun County, Virginia —

  The Sheriff's Office provides an online mapping and analysis service that combines the value of law enforcement data with the ease of use of Google-based mapping and...

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• County

  Cook County Municipalities with City Hall Addresses and URLs

  Cook County of Illinois —

  Cook County is home to over 130 municipalities. This dataset lists each of those municipalities along with their websites and city hall locations

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• County

  November 2025 General Election - Final Precinct Results

  King County, Washington —

  Final precinct level results for the November 2025 general election.

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  MetroTaxDist

  Cook County of Illinois —

  Metropolitan Water Reclamation Taxing Districts in Cook County

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  Department of Revenue - Unincorporated Cook County Municipalities by Township and ZIP

  Cook County of Illinois —

  Data last updated September 8th, 2011

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  Employee Salaries - 2022

  Montgomery County of Maryland —

  Annual salary information including gross pay and overtime pay for all active, permanent employees of Montgomery County, MD paid in calendar year 2022. This...

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