Data from Public Health England, supplemented by the ONS and published by Northumberland County Council shows the Covid-19 rate was 266 per 100,000 on January 18.
There were 852 positive cases in the week up to that date, an increase of 8.67% on the previous week.
Here are the wards with the highest Covid-19 rates.
1. Hexham East
There were 37 positive cases in Hexham East where the rate is 808.4 per 100,000.
2. Berwick West with Ord
There were 25 positive cases in Berwick West with Ord and the rate is 598.8 per 100,000.
3. Cramlington East
There were 22 positive cases in Cramlington East where the rate is 519.6 per 100,000.
4. Prudhoe North
There were 27 positive cases in Prudhoe North where the rate is 502.8 per 100,000.