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Determined from Emergency Service Number (ESN) dispatch areas obtained from Bexar Metro 911.
**Notes: As of June 2019, CoSA officially annexed the Halliburton Industrical District (2019-03-21-0233), formerly part of ESD 6. District is still included in ESD6 as part of most recent ESN response data.
**ESD 9 created November 2021