Area Code 660-857 located in MILAN, SULLIVAN, MO, more detail is as below. Place NPA (Numbering Plan Area) : 660 NXX (Local Number Prefix) : 857 City : MILAN County : SULLIVAN State : MO (Missouri) NXX Use Type : Landline NXX Intro Version : 1998-01-25 FIPS (Federal Information Processing Standards) : 29211 LATA (Local Access Transport Area) : 524 Rate Center : WINIGAN ZIP Code Count : 14 ZIP Code Frequency : 12 ZIP Code : 63556 Other Information NPANXX : 660857 Switch CLLI (Common Language Location Identifier) : WNGNMOXADS0 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : NORTHEAST MISSOURI RURAL TELEPHONE CO. OCN (Operating Company Number) : 1931 Coverage Area Name : WINIGAN Latitude : 40.0502 Longitude : -92.9023 ‹ previous : 660-857 next › : 660-857 Telephone Number List 660-857-0000 ~ 660-857-9999