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GHC911 ESN LAW1
as of 01/01/2026. Dataset contains polygons representing Law Enforcement response zones for Harris County.
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 |
1,550 matches (likely staff working copies and non-Houston research layers hidden)
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.
Feature layer generated from running the Dissolve Boundaries analysis tool.
Parcel polygon is the delineation of the property boundary
Harris_City_Limits_Unincorporated
Produced from FPM and HRRM county facilities data for the purpose of isolating Justice of Peace Courthouses from larger data set which was not descriptive enough to query JP courthouses. Updated JPs 1/4/22
Harris County JP precinct boundaries maintained by Harris Co. ITC-GIS. Boundaries are aligned to H-GAC imagery and county boundary.
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 Oct 2024
Harris County courthouse annexes.
Apartment buildings sourced from HCAD parcels by extracting B1 Land Use Code
Harris County Boundary Layer
HARRIS_COUNTY_CITY_LIMITS
Harris County Commissioner Precinct 1 Boundary and Mask for use in Open GIS Applications (i.e., FEMA RAPT). For reference purposes only. H-GAC Regional Data Hub
Harris County Commissioner Precinct 1 Boundary and Mask for use in Open GIS Applications (i.e., FEMA RAPT). For reference purposes only. H-GAC Regional Data Hub
Harris County Commissioner Precinct 1 Boundary and Mask for use in Open GIS Applications (i.e., FEMA RAPT). For reference purposes only. H-GAC Regional Data Hub
Harris County Commissioner Precinct 2 Boundary and Mask for use in Open GIS Applications (i.e., FEMA RAPT). For reference purposes only. H-GAC Regional Data Hub
Harris County Commissioner Precinct 2 Boundary and Mask for use in Open GIS Applications (i.e., FEMA RAPT). For reference purposes only. H-GAC Regional Data Hub
Harris County Commissioner Precinct 2 Boundary and Mask for use in Open GIS Applications (i.e., FEMA RAPT). For reference purposes only. H-GAC Regional Data Hub
Harris County Commissioner Precinct 3 Boundary and Mask for use in Open GIS Applications (i.e., FEMA RAPT). For reference purposes only. H-GAC Regional Data Hub
Harris County Commissioner Precinct 3 Boundary and Mask for use in Open GIS Applications (i.e., FEMA RAPT). For reference purposes only. H-GAC Regional Data Hub
Harris County Commissioner Precinct 3 Boundary and Mask for use in Open GIS Applications (i.e., FEMA RAPT). For reference purposes only. H-GAC Regional Data Hub
Harris County Commissioner Precinct 4 Boundary and Mask for use in Open GIS Applications (i.e., FEMA RAPT). For reference purposes only. H-GAC Regional Data Hub
Harris County Commissioner Precinct 4 Boundary and Mask for use in Open GIS Applications (i.e., FEMA RAPT). For reference purposes only. H-GAC Regional Data Hub
Harris County Commissioner Precinct 4 Boundary and Mask for use in Open GIS Applications (i.e., FEMA RAPT). For reference purposes only. H-GAC Regional Data Hub
Current, court approved, official commissioner precincts for Harris County TX
Copy of official Harris County commissioner precinct precinct boundaries updated to contain links to service request form
Official Commissioner's Precinct Boundaries as defined by consultant Andrews Kurth LLP.
Current, court approved, official data from revised A-1 commissioner precinct map as of 8/11/11. Formerly, Proposed_Comm_Pct2011RevisedA1. Updated to reflect...
Harris County Concrete Batch Plant
Harris County constable precinct boundary maintained by Harris Co. ITC. Boundaries are aligned to H-GAC imagery and county boundary is clipped to ITC_Harris_County_Boundary Updated to reflect 2016 election results
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.