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.
1. Blyth Isabella
There were five positive cases in Blyth's Isabella ward where the rate is 105.4 positive cases per 100,000.
2. Berwick East
The rate in Berwick East is 82.6.
3. Bedlington Central
The rate in Bedlington Central is 57.0.
The rate in Plessey is 51.8.