The results reiterate Northland's "cannabis capital" reputation.
"I'd be very surprised if [other regions] get anything anywhere near that," he said.
Ripping out of thousands of cannabis plants and discovering crops hidden in odd places was all in a day's work for police working the annual operation.
"They love it," Mr Miller said of his officers.
"A lot of it is the unknown ... It can be dangerous, but you're always finding associated crime as well."
Police recovered $109,000 worth of stolen property during the operation.
A particularly memorable discovery among the 14 indoor grows found was the Matapouri chicken coop bust.
"A few years earlier he [the grower] had dug it out with a digger, built an underground container, covered it over and put a chook house on top," Mr Miller said.
No chickens were present in the coop.
The dark side of the busts came where there were children at the raided properties, he said.
Police involved Child, Youth and Family after a two-year-old was found at an address that was also home to more than 50 morphine-compound pills and a number of syringes.
It was one of three CYF referrals made this year.
"It's not an environment children should be brought up in," Mr Miller said.
Dangers to officers included booby traps and possum traps protecting outdoor grow operations.
Operation Dee consisted of seven phases - three of which included the execution of 20 search warrants, while during others police flew over "traditional growing areas", spraying and killing as many plants as possible. Plants ranged in size from tiny seedlings to 3-metre whoppers.
When questioned about the most prolific areas, Mr Miller said: "I shouldn't say the entire Northland area, should I? The traditional areas tend to be west of Kaikohe, and the areas around Kaitaia."
Last year's operation netted just over 67,000 plants, up on 46,224 the year before.
However, the busts did not only target marijuana. A methamphetamine lab was also shut down, with 101.7 grams of the Class A substance seized.
"Labs have become more mobile and the crooks get better at hiding those sorts of things from us."
As the discourse towards marijuana use appeared to be softening in New Zealand, Mr Miller said he still believed the drug caused a lot of harm.
"I think cannabis causes more harm in our young people. Meth is well-documented as to the harm it causes users - but it tends to be more in adults.
"I think people start with cannabis and move on to the harder drugs," he said.
The Guardian Australia and New Zealand's Spinoff news site have recently reported there is a cannabis shortage .
"We've got a shortage? We might be doing some good then," Mr Miller said.
As for the growers themselves, Mr Miller said there was an element of resignation when officers busted in.
"We've had people who have grown for years ... comment to us that 'yes, I thought you'd come and get me one day'."
Factbox:
* Cannabis plants: 68,499
* Arrests: 124
* Warrants: 20
* Firearms seized: 41
* Indoor grow operations: 14
* Methamphetamine seized: 101.7 grams
* Meth labs: 1
* Morphine sulphate tablets: 56
* Tinnies: 35
* Dried cannabis head: 8kg
* Dried cannabis leaf: 5kg
* Stolen property recovered: $109,000
* Cash seized: $71,765
* Child, Youth and Family referrals: 3
* Infringement offence notices: 63
