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)
GIS data files downloaded from HCAD (http://pdata.hcad.org) 4/11/23. GIS MUD data is updated quarterly by HCAD GIS personnel and uploaded to repository. The last HCAD update Apr 2023 next update Jan 2024
GIS data files downloaded from HCAD (http://pdata.hcad.org) 4/11/23. GIS MUD data is updated quarterly by HCAD GIS personnel and uploaded to repository. The last HCAD update Apr 2023 next update Jan 2024
Parcel polygon is the delineation of the property boundary provided by Harris County Appraisal District
Harris County Parks. To be distributed to county agencies for public display, cartographic use, general GIS purposes. Data updated and maintained by Harris County Engineering as reported by Precinct contacts upon request. Please contact ashli.prejean@eng.hctx.net with any conc…
Current, court approved, official data from revised A-1 commissioner precinct map as of 8/11/11. Formerly, Proposed_Comm_Pct2011RevisedA1. Updated to reflect...
The purpose for the ZIP code layer is to make a more accurate ZIP code polygon layer for 13-county H-GAC region in the Houston area. It is in ESRI shapefile format.
This feature layer delineates Community Relations Liaison geographic responsibility areas within Harris County Precinct 2. The boundaries are used to support community outreach, constituent services, event coordination, and internal operational awareness by identifying liaison co…
Harris County Precinct Boundaries
Harris County Road Log for cataloging managed and unmanaged road segments.
DrugMap
DrugsMap
Location data for Harris County TRI Facilities
watersheds
GIS data files downloaded from HCAD (from http://pdata.hcad.org) 7/11/2019. GIS county data is updated quarterly by HCAD GIS personnel and uploaded to...
TCEQ surface water bodies with total water releases from TRI sites.
TCEQ surface water bodies with total water releases from TRI sites.
The purpose for the ZIP code layer is to make a more accurate ZIP code polygon layer for 13-county H-GAC region in the Houston area. It is in ESRI shapefile...
Key Maps, Inc.'s copyrighted map base
Harris County Key Map with Label Scale Range
CDC's Social Vulnerability Index 2SVI) is a tool, created by the Geospatial Research, Analysis & Services Program (GRASP), to help public health officials and...
[Legacy Portal] Harvey Debris Open Data Set
Sourced data from ACS 2020 HHs w/No Internet Access (5Yr) (%)
Central Air Conditioning percentage by Census tract for Harris County, Texas.
Apartment buildings sourced from HCAD parcels by extracting B1 Land Use Code parcels and join it with the building_other table from HCAD to get apartment information (number of units, date erected, etc). I determine commissioner precinct and unincorporated/incorporated location b…
The data from the HCAD Real & Personal Property Database. It is for the specific zip codes in Houston area
Official DatasetCity boundaries provided by Harris County Appraisal District (HCAD)
HCAD City Limits
GIS data files downloaded from HCAD (http://pdata.hcad.org) 2/7/19. GIS emergency service district (ESD) data primarily for EMS is updated quarterly by HCAD GIS personnel and uploaded to repository. The last HCAD update Jan 2019 next update July 2022
GIS data files downloaded from HCAD (http://pdata.hcad.org) 4/4/22. GIS emergency service district (ESD) data primarily for fire response is updated quarterly by HCAD GIS personnel and uploaded to repository. The last HCAD update Jan 2022, next update July 2022
This is a customized version Harris County Parcels that includes estimated FFE elevations. The FFE elevation comes from two possible sources. If available, the elevation is copied from the parcels in the Structure Inventory dataset maintained by the Harris County Flood Control Di…
HCAD Subdivisions as of August 2026 with Single Point of Entry (FMO derived)
GIS data files downloaded from HCAD (from http://pdata.hcad.org) 3/2/2015. GIS county data is updated quarterly by HCAD GIS personnel and uploaded to repository. The last HCAD update Mar 20 next update July 2024
HC_Comm_Pct4_Services_Area
HC_Comm_Pct4_Services_Area
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.