Not loaded
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)
as of 12/18/25 Harris County managed Hike & Bike Trails as specified by each Precinct. Does not include all park trails accessible to the public. Does not include minor walking or jogging trails and pathways within park boundaries. Attribute data is best information available at…
Travis County HHS Housing Services Applications since 2014 to 2018 by ZIP Code. Low Income Home Energy Assistance Program (LIHEAP) applications and DOE Weatherization Assistance Program (WAP) applications.
TSARP CAP CLASS
TSARP CAP CLASS
HCFCD Watersheds (Shaded)
Well Locations from TWDB Brackish Resources Aquifer Characterization System (BRACS).
This administrative boundary represents the Texas Water Development Board (TWDB) designated Groundwater Management Areas (GMA). On December 15, 2011 addresses...
Well Locations from TWDB Groundwater Database (GWDB). Updated 7/22/2021.
The 9 major aquifers of Texas as defined by the TWDB, Updated December 2006.
Official minor aquifer boundaries in the state of Texas as declared by the Texas Water Development Board. The 22 minor aquifers. Updated December 2017.
When wells are drilled, the driller’s report includes a proposed yield or volume of water that can be withdrawn from the well over a certain amount of time, in...
A few wells that withdraw a lot of water at once and many wells that withdraw small amounts can each impact an aquifers’ water supplies. To show the aggregate...
Public water system boundaries, developed by TWDB. Published by TWDB 2/2019.
TWDB Regional Water Planning Areas.
Texas river basins as defined by the Texas Water Development Board.
Well Locations from TWDB Submitted Driller's Reports Database (SDRDB).
U.S. House of Representatives Congressional Districts of Texas effective January 3rd 2025.
This feature class displays attributes that were routed on a polyline layer of certain roadbeds using linear referencing tools to the TxDOT_Roadway_Linework. Centerline buffered by 35 feet both sides.
List of all TxGLO Beach Watch Stations and attributes.
Seagrass layer created by combining data from Texas Parks and Wildlife, US Fish and Wildlife, Texas A&M, and Texas General Land Ofice.
Cartographic display at 1:24,000 and smaller scales. Data are not intended for navigational purposes.
Texas State Legislative District Boundary effective January 10th 2025.
2019 Texas State Legislative District Boundary.
Service Summary
Texas State Senate District Boundary effective January 10th 2025.
2019 Texas State Senate District Boundary.
Feature layer generated from running the Enrich Layer analysis tool.
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.