To faciltiate users, the United States of America is divided into regions known as Area Codes, corresponding to particular geographic telephone dialing areas.
An area code denotes the regional location of a phone number within the United States.
The Area Code table below shows an area codes each.
Area Code 857 listing, by city
@The cities listed with each area code are the major cities for that area code;
| City / State | Area code | Zip Code | County | Iso | |
|---|---|---|---|---|---|
| Allston (Massachusetts) | 857 | 02134 | Suffolk | US-MA | |
| Allston (Massachusetts) | 857 | 02134 | Suffolk | US-MA | |
| Bedford (Massachusetts) | 857 | 01730 | Middlesex | US-MA | |
| Bedford (Massachusetts) | 857 | 01730 | Middlesex | US-MA | |
| Belmont (Massachusetts) | 857 | 02478 | Middlesex | US-MA | |
| Belmont (Massachusetts) | 857 | 02478 | Middlesex | US-MA | |
| Boston (Massachusetts) | 857 | 2203 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02111 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02114 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02115 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02116 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02127 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02128 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02215 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02283 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02114 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02163 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02199 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02133 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02284 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02210 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02116 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02110 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02127 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02111 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02283 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02111 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02114 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02115 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02116 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02127 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02128 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02215 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02283 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02114 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02163 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02199 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02133 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02284 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02210 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02116 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02110 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02127 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02111 | Suffolk | US-MA | |
| Boston (Massachusetts) | 857 | 02283 | Suffolk | US-MA | |
| Brighton (Massachusetts) | 857 | 02135 | Suffolk | US-MA | |
| Brighton (Massachusetts) | 857 | 02135 | Suffolk | US-MA | |
| Brookline (Massachusetts) | 857 | 02445 | Norfolk | US-MA | |
| Brookline (Massachusetts) | 857 | 02446 | Norfolk | US-MA | |
| Brookline (Massachusetts) | 857 | 02445 | Norfolk | US-MA | |
| Brookline (Massachusetts) | 857 | 02446 | Norfolk | US-MA | |
| Cambridge (Massachusetts) | 857 | 02138 | Middlesex | US-MA | |
| Cambridge (Massachusetts) | 857 | 02138 | Middlesex | US-MA | |
| Cambridge (Massachusetts) | 857 | 02139 | Middlesex | US-MA | |
| Cambridge (Massachusetts) | 857 | 02141 | Middlesex | US-MA | |
| Cambridge (Massachusetts) | 857 | 02142 | Middlesex | US-MA | |
| Cambridge (Massachusetts) | 857 | 02138 | Middlesex | US-MA | |
| Cambridge (Massachusetts) | 857 | 02138 | Middlesex | US-MA | |
| Cambridge (Massachusetts) | 857 | 02139 | Middlesex | US-MA | |
| Cambridge (Massachusetts) | 857 | 02141 | Middlesex | US-MA | |
| Cambridge (Massachusetts) | 857 | 02142 | Middlesex | US-MA | |
| Chelsea (Massachusetts) | 857 | 02150 | Suffolk | US-MA | |
| Chelsea (Massachusetts) | 857 | 02150 | Suffolk | US-MA | |
| Dorchester (Massachusetts) | 857 | 02121 | Suffolk | US-MA | |
| Dorchester (Massachusetts) | 857 | 02122 | Suffolk | US-MA | |
| Dorchester (Massachusetts) | 857 | 02121 | Suffolk | US-MA | |
| Dorchester (Massachusetts) | 857 | 02122 | Suffolk | US-MA | |
| Dorchester (Massachusetts) | 857 | 02121 | Suffolk | US-MA | |
| Dorchester (Massachusetts) | 857 | 02122 | Suffolk | US-MA | |
| Dorchester (Massachusetts) | 857 | 02121 | Suffolk | US-MA | |
| Dorchester (Massachusetts) | 857 | 2122 | Suffolk | US-MA | |
| Everett (Massachusetts) | 857 | 02149 | Middlesex | US-MA | |
| Everett (Massachusetts) | 857 | 02149 | Middlesex | US-MA | |
| Hanscom Afb (Massachusetts) | 857 | 01731 | Middlesex | US-MA | |
| Hanscom Afb (Massachusetts) | 857 | 01731 | Middlesex | US-MA | |
| Hyde Park (Massachusetts) | 857 | 02136 | Suffolk | US-MA | |
| Hyde Park (Massachusetts) | 857 | 02136 | Suffolk | US-MA | |
| Jamaica Plain (Massachusetts) | 857 | 02130 | Suffolk | US-MA | |
| Jamaica Plain (Massachusetts) | 857 | 02130 | Suffolk | US-MA | |
| Needham (Massachusetts) | 857 | 02492 | Norfolk | US-MA | |
| Needham (Massachusetts) | 857 | 02492 | Norfolk | US-MA | |
| Needham (Massachusetts) | 857 | 02492 | Norfolk | US-MA | |
| Needham (Massachusetts) | 857 | 2492 | Norfolk | US-MA | |
| Newton (Massachusetts) | 857 | 02458 | Middlesex | US-MA | |
| Newton (Massachusetts) | 857 | 02458 | Middlesex | US-MA | |
| Newtonville (Massachusetts) | 857 | 02460 | Middlesex | US-MA | |
| Newtonville (Massachusetts) | 857 | 02460 | Middlesex | US-MA | |
| Quincy (Massachusetts) | 857 | 02169 | Norfolk | US-MA | |
| Quincy (Massachusetts) | 857 | 02170 | Norfolk | US-MA | |
| Quincy (Massachusetts) | 857 | 02171 | Norfolk | US-MA | |
| Quincy (Massachusetts) | 857 | 02169 | Norfolk | US-MA | |
| Quincy (Massachusetts) | 857 | 02170 | Norfolk | US-MA | |
| Quincy (Massachusetts) | 857 | 02171 | Norfolk | US-MA | |
| Roxbury (Massachusetts) | 857 | 02119 | Suffolk | US-MA | |
| Roxbury (Massachusetts) | 857 | 02119 | Suffolk | US-MA | |
| Somerville (Massachusetts) | 857 | 02143 | Middlesex | US-MA | |
| Somerville (Massachusetts) | 857 | 02144 | Middlesex | US-MA | |
| Somerville (Massachusetts) | 857 | 02145 | Middlesex | US-MA | |
| Somerville (Massachusetts) | 857 | 02143 | Middlesex | US-MA | |
| Somerville (Massachusetts) | 857 | 02144 | Middlesex | US-MA | |
| Somerville (Massachusetts) | 857 | 02145 | Middlesex | US-MA | |
| Watertown (Massachusetts) | 857 | 02472 | Middlesex | US-MA | |
| Watertown (Massachusetts) | 857 | 02472 | Middlesex | US-MA | |
| West Newton (Massachusetts) | 857 | 02465 | Middlesex | US-MA | |
| West Newton (Massachusetts) | 857 | 02465 | Middlesex | US-MA | |
| Winthrop (Massachusetts) | 857 | 02152 | Suffolk | US-MA | |
| Winthrop (Massachusetts) | 857 | 02152 | Suffolk | US-MA |