Most foreign visitors to holiday parks came from the UK (21 per cent), Australia (18 per cent), and Germany (15 per cent).
The study also found that campervan travellers were of high value to holiday parks, spending an average of $183.82 per person per day.
"Holiday parks make a significant economic contribution to their local community, the research found," HAPNZ chief executive Fergus Brown said.
"Parks employ staff, purchase supplies, spend on facility maintenance, and pay marketing and professional services fees," he said.
"Holiday parks provide a genuine authentic New Zealand holiday experience. The sector is heartened to see a change from parks being sold for redevelopment to new parks being established, with developments in Glenorchy and Hokitika being recent examples."