Telephone country codes never begin with zero. 00 is a commonly used international access prefix, but not part of the country code.
Assuming that 00 is your international access prefix, you're asking about country code +1, which is North America, including the USA, Canada, and various Caribbean-ish islands. You need the following three digits to narrow down the location.
On the other hand, if your international prefix is 001, then you're asking about country code +38, which is an incomplete country code somewhere in Europe. Again, you need one additional digit to be specific.
To avoid this sort of confusion, it is best to quote an international telephone number beginning with the plus sign and the country code, omitting any access prefix.
(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.)
00937 is Postal code in Puerto Rico
witch area code is this 00937-9441743
00937-0250
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
Country code +57 is Colombia.
Country code 52 is Mexico.
Fiji has telephone country code +679.
Gibraltar is country code +350.
Moldova is country code +373.
Slovenia is country code +386.