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.
| Source | What it is | Items | Loaded |
|---|---|---|---|
| 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. | 3,112 | 16 |
| 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. | 2,888 | 0 |
| Houston Advanced Research Center (HARC) ArcGIS Online services2.arcgis.com |
Environmental and regional research layers; source of the 2021 city cool-center list. | 528 | 1 |
| City of Houston GIS (ArcGIS Hubs) geohub.houstontx.gov |
Two Hub sites (Public Works geohub, citywide mycity) over several ArcGIS servers. Official. | 314 | 119 |
| Harris County Flood Control District ArcGIS Online services2.arcgis.com |
High-water marks, floodplains, projects, acreage by program. Source of the storm HWM layers. | 265 | 4 |
| 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. | 94 | 0 |
| U.S. Census Bureau api.census.gov |
4 | 3 | |
| FEMA (OpenFEMA and National Flood Hazard Layer) www.fema.gov |
4 | 3 | |
| U.S. Environmental Protection Agency data.epa.gov |
2 | 2 | |
| Centers for Disease Control and Prevention data.cdc.gov |
2 | 2 | |
| Texas Commission on Environmental Quality www.tceq.texas.gov |
2 | 1 | |
| Texas Water Development Board www.twdb.texas.gov |
1 | 1 | |
| U.S. Geological Survey water data waterservices.usgs.gov |
1 | 0 | |
| City of Houston 311 public data extracts www.houstontx.gov |
1 | 1 | |
| METRO (Harris County transit) www.ridemetro.org |
1 | 0 | |
| Stanford Open Policing Project openpolicing.stanford.edu |
1 | 0 | |
| TxDOT Crash Records Information System (CRIS) cris.dot.state.tx.us |
1 | 0 |
2,869 matches (likely staff working copies and non-Houston research layers hidden)
The For Us Tree project area is extracrted from the Climate and Economic Justice Screening Tool (CEJST) dataset. The data is by Census tracts and the areas are all DACs. Climate and Economic Justice Screening Tool provides important information by identifying communities that exp…
The Tree Tracking data represent all trees and shrubs planted and fruit trees given away to community members as part of the ForUsTree project.
The Tree Tracking data represent all trees and shrubs planted and fruit trees given away to community members as part of the ForUsTree project.
[Legacy Portal] Article VII of Chapter 39 of the Code of Ordinances makes it unlawful for any commercial solid waste operator to collect, haul or transport solid waste or industrial waste from...
Public fueling station that accept fuelman and county only accessible stations
FWS Regional Channels in the HCFCD & SJRA Region.
Heat level percentage in the Galvenston Neighborhoods. Heat level data is the Trust for Public Land's Heat Severity - USA 2021.
Heat level percentage in the Galvenston Neighborhoods. Heat level data is the Trust for Public Land's Heat Severity - USA 2021.
Galveston County per US Census showing coastline delineations.
GBEP projects that specifically dealt with bird habitat and overlap with brown pelican nesting sites. Data is used for the SOTB story map.
GBEP projects that specifically dealt with bird habitat and overlap with brown pelican nesting sites. Data is used for the SOTB story map.
This digital dataset divides the Galveston Bay system into segment ID's
GBEP Watersheds Summary Stats in all classes and all years.
Watersheds as defined by the Galveston Bay Estuary Program.
Summary statistics for Galveston Bay Estuary Program Watersheds. Include new NOAA CCAP 2021.
Summary statistics for Galveston Bay Estuary Program Watersheds.
NBS projects locations. Public Version.
This layer is used in the old 2014 Galveston Bay Oil Spill app.
This layer is used in the old 2014 Galveston Bay Oil Spill app.
This layer is used in the old 2014 Galveston Bay Oil Spill app.
This layer is used in the old 2014 Galveston Bay Oil Spill app.
Galveston Bay Report Card study area outline.
Update grades of nitrogen, phosphorus, dissolved Oxygen, and bacteria Galveston Bay Report Card 2021. Also include wetlands area and developed area in 2016.
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.