Area Code 231-585 located in ELMIRA, OTSEGO, MI, more detail is as below. Place NPA (Numbering Plan Area) : 231 NXX (Local Number Prefix) : 585 City : ELMIRA County : OTSEGO State : MI (Michigan) NXX Use Type : Landline NXX Intro Version : 1999-07-22 FIPS (Federal Information Processing Standards) : 26137 LATA (Local Access Transport Area) : 348 Rate Center : LAKE NORTH ZIP Code Count : 240 ZIP Code Frequency : 31 ZIP Code : 49730 Other Information NPANXX : 231585 County Population : 0 Switch CLLI (Common Language Location Identifier) : LKNRMIXJDS0 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : PIGEON TELEPHONE CO. OCN (Operating Company Number) : 0721 Coverage Area Name : ELMIRA Latitude : 44.9249 Longitude : -84.8715 ‹ previous : 231-584 next › : 231-585 Telephone Number List 231-585-0000 ~ 231-585-9999