Houston Open Data Explorer

Houston Open Data Catalog

Houston and Harris County publish a huge amount of open data, scattered across dozens of portals nobody tracks. This catalog lists every dataset we've found in one place, whether or not it's loaded into the explorer. Know a source we're missing? Add it, and it's shared with everyone.

7,221datasets and layers found
17portals and publishers
153loaded and joinable in the explorer
Where the data lives (17 sources)
SourceWhat it isItemsLoaded
Harris County ArcGIS Online
services.arcgis.com
One organization shared by county departments, precincts and staff. Mixes authoritative layers (fire stations, parks, crashes) with many working copies and one-off maps; review before use. 3,11216
Rice University ArcGIS Online
services.arcgis.com
Research and class projects. Houston gems (HCFCD buyout lots, draft 2026 FEMA flood map, historical census, redlining) among worldwide student work. Research copies of agency data need permission before reuse. 2,8880
Houston Advanced Research Center (HARC) ArcGIS Online
services2.arcgis.com
Environmental and regional research layers; source of the 2021 city cool-center list. 5281
City of Houston GIS (ArcGIS Hubs)
geohub.houstontx.gov
Two Hub sites (Public Works geohub, citywide mycity) over several ArcGIS servers. Official. 314119
Harris County Flood Control District ArcGIS Online
services2.arcgis.com
High-water marks, floodplains, projects, acreage by program. Source of the storm HWM layers. 2654
City of Houston Open Data (data.houstontx.gov)
data.houstontx.gov
Separate from the GIS hubs. Mostly spreadsheets; finance (checkbook, payroll, budget) and census stay current, much else frozen since a 2023 migration. 940
U.S. Census Bureau
api.census.gov
43
FEMA (OpenFEMA and National Flood Hazard Layer)
www.fema.gov
43
U.S. Environmental Protection Agency
data.epa.gov
22
Centers for Disease Control and Prevention
data.cdc.gov
22
Texas Commission on Environmental Quality
www.tceq.texas.gov
21
Texas Water Development Board
www.twdb.texas.gov
11
U.S. Geological Survey water data
waterservices.usgs.gov
10
City of Houston 311 public data extracts
www.houstontx.gov
11
METRO (Harris County transit)
www.ridemetro.org
10
Stanford Open Policing Project
openpolicing.stanford.edu
10
TxDOT Crash Records Information System (CRIS)
cris.dot.state.tx.us
10

2,869 matches (likely staff working copies and non-Houston research layers hidden)

City of Houston GIS (ArcGIS Hubs) · layer · polyline · 1 records

Hub keywords: HPC;Encroachments

City of Houston GIS (ArcGIS Hubs) · layer · polygon · 18 records

Hub keywords: HPC;Encroachments

Houston Advanced Research Center (HARC) ArcGIS Online · layer · point

This is a January 2023 snapshot of the Energy Star Portfolio Manager data for City of Houston buildings. This data was exported directly from the City of Houston’s ESPM shared to HARC and references Energy Use Intensity (EUI) Targets established by the 2022 City of Houston Decarb…

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EPA AVERT Regions

Houston Advanced Research Center (HARC) ArcGIS Online · layer · polygon

AVERT regions are aggregates of boundaries used by regional balancing authorities. AVERT regions are not strictly defined by state geography, but by the generators that fall within their borders. Thus, the map of AVERT regions is for representational purposes only. You can consul…

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EPA Eco Regions

Houston Advanced Research Center (HARC) ArcGIS Online · layer · polygon

Assist managers of aquatic and terrestrial resources in understanding the regional patterns of the realistically attainable quality of these resources.

City of Houston GIS (ArcGIS Hubs) · layer · polygon · 6 records

Hub keywords: FifthWard_KashmereClusterDashboard;MapServer

Houston Advanced Research Center (HARC) ArcGIS Online · layer · polygon

This geospatial dataset contains cancer risk estimates for the 2011 National Air Toxics Assessment (NATA). The dataset contains risk estimates by emissions source group and by pollutant at the census tract level. The cancer risk estimates are based on air quality and dispersion m…

Houston Advanced Research Center (HARC) ArcGIS Online · layer · polygon

This geospatial dataset contains cancer risk estimates for the 2014 National Air Toxics Assessment (NATA). The dataset contains risk estimates by emissions source group and by pollutant at the census tract level. The cancer risk estimates are based on air quality and dispersion m…

Houston Advanced Research Center (HARC) ArcGIS Online · layer · polygon

This geospatial dataset contains cancer risk estimates for the 2011 National Air Toxics Assessment (NATA). The dataset contains risk estimates by emissions source group and by pollutant at the census tract level. The cancer risk estimates are based on air quality and dispersion m…

Houston Advanced Research Center (HARC) ArcGIS Online · layer · polygon

This geospatial dataset contains cancer risk estimates for the 2014 National Air Toxics Assessment (NATA). The dataset contains risk estimates by emissions source group and by pollutant at the census tract level. The cancer risk estimates are based on air quality and dispersion m…

Houston Advanced Research Center (HARC) ArcGIS Online · layer · point

EPA's Enforcement and Compliance History Online dataset. Download from https://echo.epa.gov/.

Houston Advanced Research Center (HARC) ArcGIS Online · layer · polygon

Provide a nationally consistent environmental justice screening tool. This is the version 2019 of EJScreen data, which are block-group based, for data queries and mapping. HARC clipped it within Texas.

Houston Advanced Research Center (HARC) ArcGIS Online · layer · polygon

EJScreen is an environmental justice (EJ) screening and mapping tool that provides EPA with a nationally consistent dataset and methodology for calculating "EJ indexes," which can be used for highlighting places that may be candidates for further review, analysis, or outreach as …

Houston Advanced Research Center (HARC) ArcGIS Online · layer · polygon

EJScreen is an environmental justice (EJ) screening and mapping tool that provides EPA with a nationally consistent dataset and methodology for calculating "EJ indexes," which can be used for highlighting places that may be candidates for further review, analysis, or outreach as …

Houston Advanced Research Center (HARC) ArcGIS Online · layer · polygon

EJScreen is an environmental justice (EJ) screening and mapping tool that provides EPA with a nationally consistent dataset and methodology for calculating "EJ indexes," which can be used for highlighting places that may be candidates for further review, analysis, or outreach as …

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ERCOH PCS

Harris County ArcGIS Online · layer · point

ERCOH PCS

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ERCOT Boundary

Houston Advanced Research Center (HARC) ArcGIS Online · layer · polygon

ERCOT Boundary.

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ERCounty PCS

Harris County ArcGIS Online · layer · point

ERCounty PCS

Not loaded

EuRate

Harris County ArcGIS Online · table
Not loaded

Events 3 Miles

Harris County ArcGIS Online · layer · polygon

Feature layer generated from running the Create Buffers analysis tool.

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EVStations

Harris County ArcGIS Online · layer · point
Not loaded

Fannin office

Harris County ArcGIS Online · layer · point
Not loaded

FBCAD Parcel

City of Houston GIS (ArcGIS Hubs) · layer · polygon · 354,085 records
Not loaded

Feb 2025

Harris County ArcGIS Online · layer · point

Add a dataset

Found Houston or Harris County open data we don't list? A portal, a map service, a spreadsheet on an agency page, a research dataset? Tell us where it is. Reviewed suggestions are added to the catalog for everyone.