Area Code 573-439 located in MONROE CITY, MONROE, MO, more detail is as below. Place NPA (Numbering Plan Area) : 573 NXX (Local Number Prefix) : 439 City : MONROE CITY County : MONROE State : MO (Missouri) NXX Use Type : Landline NXX Intro Version : 1996-01-10 FIPS (Federal Information Processing Standards) : 29137 LATA (Local Access Transport Area) : 520 Rate Center : PHILA ZIP Code Count : 54 ZIP Code Frequency : 9 ZIP Code : 63456 Other Information NPANXX : 573439 County Population : 0 Switch CLLI (Common Language Location Identifier) : PHLAMOXADS0 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : MARK TWAIN RURAL TELEPHONE CO. OCN (Operating Company Number) : 1914 Coverage Area Name : PHILADELPHIA Latitude : 39.8406 Longitude : -91.7509 ‹ previous : 573-439 next › : 573-439 Telephone Number List 573-439-0000 ~ 573-439-9999