UK area code 0161 (or +44 161 in international format) is Manchester.A number beginning with 0161 284 is most likely a Virgin Media landline, but could be locat Read more Calling and Area Codes +1 Where is prefix 425 with area code 301? Asked by Wiki User The area code 301 covers the state of Maryland in the United States. Therefore, prefix 425 with area code 301 would also be located in Maryland.