New Zealand Police said the site was fully operational and it was up to each district whether they wanted to take part.
A spokeswoman said the most wanted page is "just one tool available" for officers trying to track people down.
"Districts may also decide to use other online mediums such as district, area or police community Facebook pages," she said.
"This decision will be made by determining which is the best channel to reach those that may have information regarding that individual."
Christchurch Police, for example, prefer to use their own facebook page to get the public's help in finding offenders, even though one cheeky man left a string of comments on his own 'wanted' page while on the run, before being arrested months later.
The national most wanted site was launched in June last year. When it kicked off, National Crime Manager Detective Superintendent Rod Drew said the site would give police a "much broader audience of people with potential information about those we're looking for".
Local media and Police Ten 7 would still be used to help find offenders, but Mr Drew said criminals can move about quickly, so having a national site gave the police "extra eyes out there".
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- Police districts using the 'most wanted' website:
Counties Manukau, Waikato, Eastern, Central and Wellington.
- Those not using it:
Auckland, Northland, Waitemata, Bay of Plenty, Tasman, Canterbury and Southern.