Data published by Northumberland County Council reveals the rate was 45.49 positive cases per 100,000 on March 30.
There were 146 positive cases across the county in the week to that date.
While large parts of the county have recorded no recent cases, there are pockets with higher rates.
Here are the 13 areas of Northumberland with the highest rates of Covid-19.
There were 20 positive cases in Lynemouth ward where the rate is 445.6 per 100,000.
2. Cramlington South East
There were seven positive cases in Cramlington South East where the rate is 153.9.
3. Prudhoe South
There were eight positive cases in Prudhoe South where the rate is 142.1.
4. Seaton with Newbiggin West
There were seven positive cases in Seaton with Newbiggin West where the rate is 134.7.