Area Code 737-999 located in HAYS, HAYS, TX, more detail is as below. Place NPA (Numbering Plan Area) : 737 NXX (Local Number Prefix) : 999 City : HAYS County : HAYS State : TX (Texas) NXX Intro Version : 3/4/2013 Rate Center : BUDA ZIP Code Count : 0 ZIP Code Frequency : 0 Other Information NPANXX : 737999 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : FOREMOST TELECOMMUNICATIONS CORPORATION - TX OCN (Operating Company Number) : 319D Latitude : None Longitude : None ‹ previous : 737-932 next › : 740-200 Telephone Number List 737-999-0000 ~ 737-999-9999