The Shire of Northam has a strong ethnic connection to the United Kingdom with 76.4% of the population identifying themselves of Australian, English, Irish or Scottish heritage.  By contrast in WA 66.6% of the population list these ancestral backgrounds, and across the Nation, the figure is 65.2% (ABS 2011).

The highest percentage of ancestry in the Northam Shire outside the United Kingdom is Germany, at 2.6%.