557 area code: location, overlays and numbers
In St. Louis, Missouri, US telephone area code 557 has served the area since 2022 and shares an overlay with 314.
- Location
- St. Louis, in Missouri
- Service start year
- 2022
- Local time zone
- Uses Central time
- Overlay
- 314
- Calls made locally
- 10-digit dialing
- The rate centres
- 7
- Expected exhaust
- 2060
- Code for the country
- +1 (United States)
Our source is the NANPA public reports: the area code report and the rate-centre report, file dated 11/01/2026. For the exhaust year, see the NANPA projections file 2026-1, dated April 2026. We are not an official NANPA site.
Get your own 557 number
A 557 number is available through two routes. A provider includes a new number with its plan. You select it during sign-up from the numbers the provider holds in the code. A seller offers numbers it already holds at a one-time price, and these listings often feature a pattern. After you choose one, you move the number to a provider.
Providers ranked by first-year cost
| Provider | Cheapest plan | First year | Link |
|---|---|---|---|
 Free app | Basic (Just for me), free | $0 | Open Google Voice |
 Free app | Free plan, free | $0 | Open TextNow |
 Developer API | Pay-as-you-go local number, $1.15 a month | $13.80 | Open Twilio |
 Second-number app | Standard, $3.99 a month billed yearly | $47.99 | Open Burner |
 Toll-free specialist | Solo, $6.99 a month billed yearly | $84 | Open UniTel Voice |
 Second-number app | Deluxe (local number), $6.99 a month billed yearly | $102.88 | Open GoDaddy Conversations (formerly Smartline) |
Sellers offering listed local numbers
| Seller | What it sells | Listed price | Monthly fee | Link |
|---|---|---|---|---|
 Marketplace | Local numbers | From $9 one-time | None stated | Search at Exclusive Digits |
 Marketplace | Local and toll-free | From $9.95 one-time | $2.99 a month | Search at NumberBarn |
 Number broker | Local and toll-free | From $99 one-time | None stated | Search at RingBoost |
 Number broker | Local and toll-free | From $100 one-time | None stated | Search at PhoneNumberExpert |
| 212areacode.comNumber broker | Local numbers | From $150 one-time | None stated | Search at 212areacode.com |
We may receive a referral fee from certain sellers and providers. First-year cost determines the order, which never changes. How we earn
Places in the 557 area code
For 557, NANPA shows 7 rate centres. Each rate centre is a local calling area where numbers are assigned:
Ladue, Oakville, Creve Coeur, Sappington, Kirkwood, Saint Louis, Mehlville.
Area codes that are related
The same area and number pool also includes 314. In this area, any of these codes can supply a new number, so ask for the one you want.
Missouri has other area codes as well: 816, 417, 573, 660, 636, 975, as well as 235.
Our city guides cover St. Louis area codes.
557 area code questions
Which area uses 557?
Area code 557 serves St. Louis, Missouri, and the surrounding St. Louis, MO-IL area.
Which country code does a 557 number use?
+1. The North American Numbering Plan includes 557. For calls from abroad, dial +1 557 followed by the 7-digit number.
What time is it in the 557 area code?
Area code 557 uses Central time.
Who uses a 557 number to make calls?
Anyone with a number in this code may be a home, mobile, local business or caller who fakes a local number. The 557 number shown on your screen indicates where it was assigned, but it does not identify the caller.