Top 10 Taxpayers Page Content TaxpayerType of BusinessTaxable Assessed ValueOncor Electric DeliveryElectric Utility$1,509,118.00Aviall IncAviation$1,246,146.00ATT/Southwestern Bell/CingularTelephone Utility$907,666.00Wal-MartRetail$754,920.00Texas InstrumentsManufacturing$746,139.00Northpark Land PartnersReal Estate Development$700,213.00Southwest AirlinesAirline$690,626.00DCI Tech Infomart LPReal Estate Development$508,215.00Post Apartment Homes LP/Real Estate Development$499,463.00FM Village Fixed Rate LLCReal Estate Development$494,726.00