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St. John, MO Area Codes

St. John, Missouri (population 6,441) uses area codes 314 and 557.

Area code314
Area code557
Time zoneCentral
Local time now…

St. John has no telephone exchange of its own in NANPA records; it is served by the Ladue exchange about 9.3 km away.

St. JohnSt. LouisOakvilleUniversity CityKirkwoodMehlvilleMaryland HeightsWebster GrovesArnoldAfftonCreve CoeurSpanish LakeConcordSt. John
St. John and nearby cities in area code 314

Carriers with St. John numbers

303 prefixes are assigned to the Ladue exchange: 43% mobile, 23% VoIP and cable, 34% landline.

CarrierPrefixes
AT&T (Southwestern Bell)83
T-Mobile52
Verizon Wireless52
AT&T Mobility27
Verizon Business (MCImetro)19
Onvoy (Sinch)17
AT&T (Teleport)15
Lumen (Level 3)9

Area codes used in St. John

Area codePrefixes serving St. JohnMain carriers in this code
314286AT&T (Southwestern Bell), AT&T Mobility, T-Mobile
55717AT&T Mobility, Onvoy (Sinch), AT&T (Teleport)

St. John phone number prefixes

Numbers starting with these first six digits were originally assigned to the Ladue exchange.

Nearby cities in area code 314

Questions

What is the area code for St. John, MO?
St. John uses 2 area codes: 314 and 557. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.
What time zone is St. John in?
St. John is in the Central time zone.