Area Code 231-290 located in INDIAN RIVER, CHEBOYGAN, MI, more detail is as below. Place NPA (Numbering Plan Area) : 231 NXX (Local Number Prefix) : 290 City : INDIAN RIVER County : CHEBOYGAN State : MI (Michigan) NXX Use Type : Landline NXX Intro Version : 1999-07-22 FIPS (Federal Information Processing Standards) : 26031 LATA (Local Access Transport Area) : 348 Rate Center : INDIAN RIV ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 49749 Other Information NPANXX : 231290 County Population : 0 Switch CLLI (Common Language Location Identifier) : TRCYMICICM2 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : NEW CINGULAR WIRELESS PCS, LLC - IL OCN (Operating Company Number) : 6534 Coverage Area Name : INDIAN RIVER Latitude : 45.4171 Longitude : -84.6150 ‹ previous : 231-288 next › : 231-291 Telephone Number List 231-290-0000 ~ 231-290-9999