Where in North America is area code 947?

No such code in North America.

Country code +94 is Sri Lanka.

(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.)
In North America (USA, Canada, etc.), area code +1 946 is unassigned.

Country code +94 is Sri Lanka.