Area Code 318-340 located in MONROE, OUACHITA, LA, more detail is as below. Place NPA (Numbering Plan Area) : 318 NXX (Local Number Prefix) : 340 City : MONROE County : OUACHITA State : LA (Louisiana) NXX Use Type : Landline NXX Intro Version : 1996-01-10 FIPS (Federal Information Processing Standards) : 22073 LATA (Local Access Transport Area) : 486 Rate Center : MONROE ZIP Code Count : 245 ZIP Code Frequency : 27 ZIP Code : 71202 Other Information NPANXX : 318340 County Population : 0 Switch CLLI (Common Language Location Identifier) : MONRLAMADS0 MSA CBSA (Core Based Statistical Area) : Monroe, LA MSA CBSA Code (Core Based Statistical Area) : 33740 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL OCN (Operating Company Number) : 9419 Coverage Area Name : MONROE Latitude : 32.5035 Longitude : -92.1135 ‹ previous : 318-339 next › : 318-340 Telephone Number List 318-340-0000 ~ 318-340-9999