from https://www2.harriscountytx.gov/itc/gis/ais/DisplayGISData.aspx
we have found several ESN (emergency service numbers) aka emergency
service zones
021 in Houston - covers 99% of the city - agencies are - HPD + HFD + HEMS
025 in Houston - agencies listed are - Intercontinental Airport PD + HFD + HEMS
026 in Houston - agencies listed are - Hobby Airport PD + HFD + HEMS
030 in Houston - agencies are - University of Texas PD + HFD + HEMS
035 in Houston - agencies are - University of Houston PD + HFD + HEMS
the nov 28 2025 fcc psap registry seems to show just 1 active PSAP in
Houston now
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