Area Code 309-554 located in LACON, MARSHALL, IL, more detail is as below. Place NPA (Numbering Plan Area) : 309 NXX (Local Number Prefix) : 554 City : LACON County : MARSHALL State : IL (Illinois) NXX Use Type : Landline NXX Intro Version : 2006-06-01 FIPS (Federal Information Processing Standards) : 17123 LATA (Local Access Transport Area) : 368 Rate Center : LACON ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 61540 Other Information NPANXX : 309554 County Population : 0 Switch CLLI (Common Language Location Identifier) : PEORILPJXSX MSA CBSA (Core Based Statistical Area) : Peoria, IL MSA CBSA Code (Core Based Statistical Area) : 37900 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL OCN (Operating Company Number) : 846F Coverage Area Name : LACON Latitude : 41.0213 Longitude : -89.4090 ‹ previous : 309-553 next › : 309-556 Telephone Number List 309-554-0000 ~ 309-554-9999