Latest data from Northumberland County Council, published by Public Health England, reveals the countywide rate is 309.7 for the week to August 21. There were 992 positive cases over the same period.
However, there are varying rates within the county with parts of the south-east recording higher case numbers.
Here are the 16 areas of Northumberland with the highest rates.
There were 28 positive cases in Blyth's Croft ward where the rate is 601.2.
There were 28 positive cases in Blyth's Isabella ward where the rate is 590.1.
3. Bedlington West
There were 24 positive cases in Bedlington West where the rate is 536.8.
4. Berwick North
There were 21 positive cases in Berwick North where the rate is 457.3.
Photo: Jane Coltman