There is no area code 173 in North America (USA, Canada, etc.). North American area codes cannot begin with '1'.
+173 as an international prefix is telephone country code +1 (North America), but is an incomplete area code. You need the three digits after country code +1 to narrow down the location any further.
There are other countries that may have a domestic area code 173 or similar, but it's impossible to tell which one you might be asking about.
The country code and area code of Noorden, Netherlands is 31, (0)173.
The country code and area code of Goshogawara- Aomori, Japan is 81, (0)173.
Code 173 indicates the oxygen sensor is telling the computer that the engine is running rich.
The area of Ussuriysk is 173 square kilometers.
The area of Queanbeyan is 173 square kilometers.
The area of Montescaglioso is 173 square kilometers.
The area of Potenza is 173 square kilometers.
The area of Kaferkahel is 173 square kilometers.
The area of Gmina Wisznice is 173 square kilometers.
The area of Koura District is 173 square kilometers.
The area of Guadeloupe National Park is 173 square kilometers.
The area of Bang Lamung District is 173 square kilometers.