"Rainbow organisations are quite underfunded and the statistics would help us highlight to those in control of funding that there is a huge need in our community," RaindowYOUTH executive director Frances Arms told Fairfax.
"The data you get from the census is incomparable."
In the 2018 General Social Survey, Statistics New Zealand will include a question on sexual orientation that will ask "which of the following options best describe how you think of yourself".
The list of possible answers includes "Heterosexual or straight, gay or lesbian, bisexual, or other".
Shaw hopes more accurate sexual orientation data will become available in the near future.