Latest data from Public Health England, published by Northumberland County Council, reveals there were 49 confirmed positive cases in the week to April 29.
The rate is 15.3 positive cases per 100,000.
Here are the 11 areas of Northumberland with the highest rates.
5. Berwick West with Ord
The rate in Berwick West with Ord is 47.9.
The rate in Ashington's Haydon ward is 45.0.
The rate in Blyth's Cowpen ward is 44.5.
The rate in Stakeford ward is 44.2.