557 area code
St. Louis area, Central Time.Area code 557 covers St. Louis, La Due, Kirkwood and 4 more places in Missouri, on Central Time. 314 covers the same area.
Right now in St. Louis
Central Time (CST, UTC-6; CDT, UTC-5 in summer)
Calling hours: Every day, 8 AM to 9 PM (the federal rule)
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Where 557 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 557 has 7. Each one's share is how many 557 numbers start there. Its biggest metro area is St. Louis, MO-IL.
- St. Louis43%
- La Due22%
- Kirkwood15%
- Creve Coeur7%
- Mehlville7%
- Sappington5%
Also: Oakville
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 557 number?
Sales calls to homes and cell phones have legal hours, set by the federal rule. Hold every 557 number to them, since you can't tell a work line from a personal cell.
What applies to 557Every day, 8 AM to 9 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
557 and 314
557 went into service on August 12, 2022. 557 and 314 cover the same area, so new numbers can get either code and neighbors can have different area codes. 557 holds 9% of the area's exchanges; 314 holds the most. Local calls take all 10 digits.
- 1947314 overlay
- 2022557 starts
Source: NANPA area code database
Calling a list of 557 numbers?
Paste it into the free phone number validator. It checks every number, finds each one's time zone and sorts the list by who you can call right now.
557 area code FAQ
What area code is 557?
557 is a Missouri area code for St. Louis, La Due, Kirkwood, Creve Coeur and 3 more places.
What time zone is the 557 area code in?
Central Time (CST, UTC-6; CDT, UTC-5 in summer).
Is 314 the same as 557?
Same area, different code. 557 and 314 cover the same area (an overlay), so new numbers can get any of them and local calls take all 10 digits.
What are the calling hours for 557 numbers?
Every day, 8 AM to 9 PM, local time, under the federal rule.
When did the 557 area code start?
On August 12, 2022.
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