Parcels, city limits, flood zones, transmission lines and census tracts for Harris County, Texas(county seat: Houston), each from its official source and checked, with a map you can open in Felt.
Each source is the publisher's own service, checked on October 10, 2026. A source that stops answering drops off this page rather than staying as a dead link. Add any of them to a Felt map by URL.
| Data | Publisher | Checked | Updated | Service |
|---|---|---|---|---|
| Parcels | TxGIO StratMap, from Harris County's appraisal districtTax year 2026. Appraisal district boundaries: approximate, not a survey. | Live | August 2026 | Service URL ↗ |
| City limits | TxDOT City BoundariesEvery incorporated city in Texas; the layer on the live map. | Live | July 22, 2026 | Service URL ↗ |
| Flood zones | FEMA National Flood Hazard LayerThe authoritative layer, kept current by FEMA. | Live | Map Jun 18, 2007; revised May 18, 2026 | Service URL ↗ |
| Transmission lines | HIFLD Electric Power Transmission LinesA national snapshot: new lines and upgrades since then can be missing. | Live | September 5, 2023 | Service URL ↗ |
| Census tracts and income | Census Bureau ACS 2019–2023, via Esri Living AtlasOn 2020 census tract boundaries; older tract counts for the county will differ. | Live | 2019–2023 estimates | Service URL ↗ |
Property search, parcel maps and data downloads from the appraisal district, and the county and city GIS, floodplain and zoning resources a local search turns up, each opened on October 10, 2026. These are where parcel records, permits and zoning decisions come from.
Free, from the source. The Texas Geographic Information Office's statewide StratMap parcel layer carries Harris County's parcels from the county appraisal district, tax year 2026, collected in August 2026. The appraisal district's own property search and parcel map are listed under local sources below. Data resellers charge for copies of the same records. Add the layer to a Felt map by URL to filter, measure and share parcels with your team.
Only inside city limits. Texas counties have no general zoning power, so unincorporated land in Harris County is unzoned. Unzoned is not unregulated: Texas counties review subdivision plats and septic systems, and most permit development in the floodplain. Each city decides whether and how to zone. Houston and Pasadena have no zoning ordinance at all. The city limits layer shows which city, if any, governs a site, and the cities' zoning maps are listed under local sources below.
26 cities and towns lie mostly inside Harris County: Houston, Pasadena, Baytown, La Porte, Deer Park, Bellaire, Humble, South Houston and 18 smaller towns. Parts of Pearland, League City, Missouri City, Friendswood, Katy and 3 others reach in from neighbouring counties. The Census Bureau's current boundaries for incorporated places map each one.
24.1% of Harris County's land and inland water lies in FEMA's Special Flood Hazard Area, the floodplain with a 1% chance of flooding in any year (zone A and its subtypes such as AE, plus V zones on the coast). The county's flood map (FIRM) took effect on June 18, 2007, with some panels revised as recently as November 15, 2019. Since then, 115 letters of map revision have changed it, the latest effective May 18, 2026. Flood zones are a planning screen, not a determination: check the effective FIRM for a specific property.
HIFLD maps 1,920 miles of transmission line inside Harris County: 1,555 mi at 138 kV and 365 mi at 345 kV. It marks 1,651 of those miles in service and records no status for the rest. The live map colours each line by voltage.
$73,104, against $76,292 for Texas (ACS 2019–2023 5-year estimates). Across its 1,115 census tracts (2020 boundaries), tract medians run from $11,592 to $250,000+, and the middle tract sits at $69,021.
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