Where in North America is area code 170?

There is no area code +1 170 in North America (USA, Canada, etc.). North American area codes never begin with 1.

Country code +1 is North America (USA, Canada, etc.), but you need the following three-digit area code to narrow down the location.

• +1 700 = (special carrier-specific numbers, domestic use only)
• +1 701 = North Dakota, USA (entire state)
• +1 702 = Las Vegas, NV, USA
• +1 703 = Arlington, VA, USA
• +1 704 = Charlotte, NC, USA
• +1 705 = Sudbury, ON, Canada
• +1 706 = Athens, GA, USA
• +1 707 = Santa Rosa, CA, USA
• +1 708 = La Grange, IL, USA
• +1 709 = Newfoundland & Labrador, Canada (entire province)

(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 Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)