Missouri currently utilizes 7 area codes. When first established by AT&T and the Bell System in 1947, 314 covered eastern Missouri including St. Louis and 816 covered northwestern Missouri including Kansas City. The most recently added was 557 in 2022 as an overlay to 314. Today, 816 is the most populated with an estimated 1.3 million of the state's 6 million residents.
Timezone:Central
Timezone:Central
Timezone:Central
557 is an overlay for area code 314.
Timezone:Central
Timezone:Central
Timezone:Central
Timezone:Central