Area Code 605-236 located in MOUNT VERNON, DAVISON, SD, more detail is as below. Place NPA (Numbering Plan Area) : 605 NXX (Local Number Prefix) : 236 City : MOUNT VERNON County : DAVISON State : SD (South Dakota) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 46035 LATA (Local Access Transport Area) : 640 Rate Center : MT VERNON ZIP Code Count : 339 ZIP Code Frequency : 92 ZIP Code : 57363 Other Information NPANXX : 605236 County Population : 0 Switch CLLI (Common Language Location Identifier) : MTVRSDXA23G MSA CBSA (Core Based Statistical Area) : Mitchell, SD MSA CBSA Code (Core Based Statistical Area) : 33580 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : SANTEL COMMUNICATIONS COOPERATIVE, INC.-SD OCN (Operating Company Number) : 1676 Coverage Area Name : MOUNT VERNON Latitude : 43.7152 Longitude : -98.2556 ‹ previous : 605-236 next › : 605-237 Telephone Number List 605-236-0000 ~ 605-236-9999