People were caught growing cannabis 200 times in Kirklees and Calderdale last year.
But the numbers are falling, according to the figures revealed under the Freedom of Information Act.
Police in Kirklees recorded 116 production of cannabis offences, down from 120 the year before and the lowest number since at least 2011/2012.
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Meanwhile in Calderdale there were 84 offences in 2014/2015, down from 104 the previous year.
Overall, there were 782 cases of the Class B drug being produced in West Yorkshire.
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This was the lowest for any year since 2011/2012 and down from 861 in 2013/14 and from 928 in 2012/13.
Last year officers at 18 English and Welsh police forces said they found 1,252 cannabis farms.
This was down more than a quarter (28.6%) from 1,825 the previous year.
And the figure was down more than two-fifths(43.3%) from their peak of 2,208 in 2011/12.
Across the forces that provided information, there were 6.8 cannabis farms for every 100,000 people last year.
A cannabis farm is defined by the Association of Chief Police Officers as 25 or more plants, at any stage of growth and in a premises adapted for the production of the drug.
This can include equipment such as hydroponics systems, high intensity lighting, ventilation and electricity meters being bypassed.
Many of the finds have been made by police acting on tip-offs from the public.
They have often been alerted by smells coming from the houses or properties concerned.
The West Yorkshire Police helicopter has also been used on occasions to detect large-scale cannabis factories.
It uses heat-sensing equipment to detect the heat generated by the hydroponic equipment.
