Area Code 289-291 located in OAKVILLE, , ON, more detail is as below. Place NPA (Numbering Plan Area) : 289 NXX (Local Number Prefix) : 291 City : OAKVILLE State : ON (Ontario) NXX Use Type : Landline NXX Intro Version : 2006-02-16 LATA (Local Access Transport Area) : 851 ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. Other Information NPANXX : 289291 County Population : 24871 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Coverage Area Name : OAKVILLE Latitude : 43.4585 Longitude : -79.6685 ‹ previous : 289-290 next › : 289-292 Telephone Number List 289-291-0000 ~ 289-291-9999