The number of reported incidents rose by more than 100 in 2014/15 compared to the previous year.
Of the 489 listed more than 100 also merited an investigation, according to the Health and Safety Executive (HSE).
A reported injury may not meet the criteria for investigation if the person involved did not receive hospital treatment.
Statistics also showed the number of reported injuries among workers has fallen from 64 in 2012/2013 to 56 in 2013/2014 and 51 in 2014/2015.
Northern Ireland MP Jim Shannon, of the Democratic Unionist Party, requested the figures in a recent parliamentary question following a string of serious incidents.
He said: “There have been some fairly horrific accidents this last period of time and I'm keen to get an idea of what government are doing about it.
"The figures show it's not just an occasional thing, it seems to be a more common occurrence.
"Whenever you get on those rides you expect to have the thrill and the excitement of the ride.
"But you expect to get off the other end and go and buy an ice cream, you don't expect to be hung upside down or referred to hospital."
Work and Pensions Minister Penny Mordaunt said the HSE's National Fairground Inspection Team (NFIT) is proactively targeting fairgrounds with known problems this year.
In response to a second parliamentary question about the safety of amusement parks, she said: "NFIT inspectors also investigate accidents and complaints.
"They have a range of options available to hold poor performers to account, including enforcement notices and prosecution for the most serious breaches of the law. Any lessons learned from these investigations are communicated to the industry."