Pest controllers have been called out hundreds of times in Kettering, Corby and East Northamptonshire this year.
East Northants has had the highest number of call-outs since April this year with 523 in total, of which 326 of these were for rats and 164 for wasps.
There were 387 call-outs for the same period in Kettering, including 94 for rats, 211 for wasps and 25 for fleas.
They also had 10 call-outs for bedbugs and four for house dust mites.
Figures for Corby show there were 313 call-outs, with 179 for wasps, 71 for rats and 30 for mice.
They also had 20 call-outs for fleas, six for ants and four for bedbugs.
Figures for previous years show that East Northants had the highest number of call-outs in recent years in the north of the county, recording 1,220 call-outs in 2011/12.
The same year saw 649 call-outs in Kettering, 540 in Corby and 217 in Wellingborough.
The data, obtained through a Freedom of Information request by the Northants Telegraph, reveals there have been some call-outs for cockroaches in recent years but only in Kettering.
While there have been no such calls so far this year, there was one call-out in 2014/15, 2012/13, 2011/12 and two in 2013/14.
Data from the other three authorities does not specify any call-outs for cockroaches.
Rats have taken the top spot in Wellingborough and East Northants since 2011/12, although it has been wasps claiming the number one position in Corby and Kettering.
Other pests who have required the attention of the pest controller in the past few years include moles and Pharoah’s ants in Kettering, bees and cluster flies in Corby, and ants in East Northants.