More than 5170 vouchers have been created for the Dubbo electorate in the first six months of this year, up on the 4622 created for the same period last year, the NSW government reports.

It comes as parents are encouraged to make the most of the Active Kids program's benefits being doubled.

From July 1 a second $100 Active Kids voucher for 2019 is available for each school-enrolled child and then from 2020 two vouchers will be available for the calendar year.

The NSW government invested an extra $40 million to expand the program.

Treasurer Dominic Perrottet said the money helped parents pay registration costs for sport and recreation, so children could participate and stay active all year round.

"Families across NSW keep telling me how much the Active Kids vouchers help them manage the cost of living," he said.

Since the Active Kids program was launched in 2018, more than one million vouchers have been redeemed and more than $100 million saved by NSW families, the government reports.

Minister for Sport John Sidoti said it was a big win for NSW when more kids could participate in sport because of the government's drive to take down the barriers to expensive registration costs.

From January to June in NSW there was an overall increase of 13 per cent in the number of Active Kids' vouchers created, including a 17 per cent rise in vouchers created for girls after an influx of registrations for dance, gymnastics, tennis and swimming Active Kids providers.

From January to June in the Dubbo electorate, the top 10 activities were soccer, rugby league, netball, rugby union, multisport, swimming, dance, active recreation, martial arts and athletics respectively.

In the first six months of 2018 the most popular sports were soccer, rugby league, netball, rugby union, gymnastics, dance, swimming, hockey, active recreation and martial arts respectively.