"He's completed the Census, so he's been counted and is free to go," Judge McDonald said.
An SNZ spokeswoman said three of the 19 prosecuted had yet to be found while the other 14 cases were still to go before the courts. The only area with more impending prosecutions than Northland is Auckland, with 21.
However, she said, while 19 were being prosecuted in the region, far more Northlanders may have failed to fill out the Census. SNZ did not prosecute everybody who failed to fill out their Census form.
Census 2013 general manager Sarah Minson said Statistics NZ continued to encourage people to complete their forms if the did not do so on Census night - March 5, 2013.
Ms Minson said since Census night SNZ had done everything possible to encourage people to participate but, as a last resort, might prosecute people who refuse to fill in their forms or provide false information.
"When deciding to prosecute someone for not completing their Census form we use the following criteria ... Whether an offence has been committed; whether there is sufficient legally admissible evidence to prove the charge beyond reasonable doubt; the seriousness of the offence and the personal circumstances of the individual."
In 2006, after the previous Census, SNZ prosecuted 72 people, resulting in 41 convictions.