Area Code 519-204 located in LONDON, , ON, more detail is as below. Place NPA (Numbering Plan Area) : 519 NXX (Local Number Prefix) : 204 City : LONDON State : ON (Ontario) NXX Use Type : Landline NXX Intro Version : 2005-10-13 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 : 519204 County Population : 35533 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Coverage Area Name : LONDON Latitude : 42.9841 Longitude : -81.2513 ‹ previous : 519-203 next › : 519-205 Telephone Number List 519-204-0000 ~ 519-204-9999