Latest data from Public Health England, published by Northumberland County Council, reveals there were 100 positive cases recorded on June 21.
There were 446 positive cases recorded in the week to June 21 and the infection rate for the same period was 139.3 positive cases per 100,000 population.
Here are the 19 areas of Northumberland with the highest rates.
There were 17 positive cases in Blyth's Isabella ward where the rate is 358.3.
2. Kitty Brewster
There were 22 positive cases in Blyth's Kitty Brewster ward where the rate is 338.9.
3. Ponteland West
There were 12 positive cases in Ponteland West where the rate is 297.0.
4. Bedlington West
There were 12 positive cases in Bedlinton West where the rate is 268.4.