Where is 175 area code?

There is no area code 175 in North America (country code +1 = USA, Canada, etc.); North American area codes never begin with 1.

There are a few area codes matching +1 75X, but you need the next digit:

• +1 754: Ft. Lauderdale, FL, USA
• +1 757: Norfolk, VA, USA
• +1 758: St. Lucia (island nation in the Caribbean)

In the UK, there are several area codes that match +44 175X (or 0175X in domestic format):

• +44 1750: Selkirk
• +44 1751: Pickering
• +44 1752: Plymouth
• +44 1753: Slough
• +44 1754: Skegness
• +44 1756: Skipton
• +44 1757: Selby
• +44 1758: Pwllheli
• +44 1759: Pocklington

There may be other countries where 175 is a valid domestic area code.

(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)