Not loaded
GBRC Watersheds Outline
Galveston Bay Report Card watershed outline.
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)
Galveston Bay Report Card watershed outline.
Galveston Bay Report Card What You Can Do tool dataset.
Galveston Bay Report Card What You Can Do tool dataset.
Feature layer generated from running the Find by Attributes and Location analysis tool.
Detailed polygon boundaries of multiple political districts and public service zones within Harris County, Texas, supporting address lookup and jurisdictional reference.
Greater Harris County 911 ESN data represents areas of responsibility for emergency responders. ESN is the number used to deliver calls to the correct Public Safety Answering Point (PSAP) which direct appropriate resources.
As of 02/2026, Dataset contains polygons representing EMS response zones for Harris County.
As of 1/16/2026. Dataset contains polygons representing EMS response zones for Harris County.
as of 12/01/2025. Dataset contains polygons representing Fire response zones for Harris County.
as of 01/01/2026. Dataset contains polygons representing Law Enforcement response zones for Harris County.
as of 01/01/26. Dataset contains polygons representing Public Safety Answering Point (PSAP) for Harris County.
eBird trends data. Each 27km x 27km region is represented by a circle polygon scaled by the relative abundance. For more info, please check https://science.ebird.org/en/status-and-trends/faq
Feature layer generated from running the Dissolve Boundaries analysis tool.
Parcel polygon is the delineation of the property boundary
This data includes three riparian corridors areas for the Headwaters to Baywaters project. They are100 years floodplain, 500 years floodplain and the outside 100 meters buffter of floodplain (100 year and 500 year combined).
TCEQ segments for streams/linear features and statistics based on 300 meters buffer.
Hydrogen Hub Funding project study area.
The exclusion zones of HARC building.
HARC parcel, building, and parking lot.
The locations of HARC building vegetation survey.
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.