How many people live in Newcastle?

Answer 1

You need to be more specific, which Newcastle?

There is a Newcastle Upon Tyne, England with a population of about 292,200.

There is a Newcastle, Australia with a population of about 288,732.

There is a New Castle, Delaware with a population of about 5,285.

There is a New Castle, Pennsylvania with a a population of about 23,273.

There is a New Castle, Illinois with a population of about 18,114.

There is a Newcastle, Washington with a population of about 10, 380.

There is a Newcastle, Oklahoma with a population of about 7,685.

I can literally just go off and name dozens of other cities called Newcastle, so in order to thoroughly answer your question, we need a country, or state, etc.