One person in the Southern Highlands has 124 guns registered to their name. Another has 89 registered guns.
These figures have been revealed by toomanyguns.org which identifies the number of gun owners and registered guns per postcode.
The private firearms ownership data was obtained through a Freedom of Information application to NSW Police by the NSW Greens.
There are 810,023 registered firearms in NSW, with more than 100 postcodes that have more than 2000 guns and six postcodes that contain more than 10,000 guns.
Field and Stream Bowral owner Craig Golding said registered firearms owners had multiple guns for several reasons.
"If they're target shooting, they could have rifles for small-bore target shooting, high-powered target shooting, clay target shooting and pistol shooting," Mr Golding said.
"If you're talking about hunting, depending on the species they hunt, they'll require a different firearm for each species and the same as pest control."
Mr Golding said registered firearms owners in the Southern Highlands were typically "farmers and sportspeople".
"In the Southern Highlands we're largely regional so a lot of our firearm owners are farmers," he said.
"We have two strong shooting clubs being the Berrima District Clay Target Club and the Hill Top Rifle Range. We also have a very active hunting club in the Wingecarribee Hunters and Anglers Club. The sport of shooting is well-established down here."
Mr Golding said in previous years, the number of women with registered firearms has increased, particularly for sporting reasons.
One of Mr Golding's customers, Moss Vale property owner Rowie Kelly, said she wanted to register for a gun for feral animal control in order to protect her animals and income.
"We live on a property and we have feral foxes. We're concerned about our sheep," she said.
Last month Shooters, Fishers and Farmers MLC Robert Borsak voiced his support for a proposal to allow property owners to shoot deer without a game licence on private property.
"It is important for farmers to be free to control game and feral animals on private property and we would encourage them to contact their local Sporting Shooters' Association of Australia (SSAA) branches or local hunting clubs for volunteer conservation hunters to help in this control program," Mr Borsak said.
"However, this must be done humanely. We certainly don't want to see deer being shot with pea-rifles and left to die a lingering death.
"The deer culled should also be used either for pet food or human consumption, they should not be wasted, it's the healthiest, cleanest meat imaginable."
The toomanyguns.org website states The Greens "accept that there are people in the community who have a genuine reason to own a gun".
"Farmers on rural properties often require firearms for euthanising injured stock or controlling wild invasive animals. Target shooting at a registered gun club is also a long-recognised and legitimate sport," The Greens said.
"Members of a shooting club and farmers may reasonably be able to establish a need for a number of guns to address their different needs. However it is impossible to see how any one citizen can establish a "genuine" or "good reason" to have dozens, or even hundreds of guns.
"In the interests of community safety it is time this loophole in the firearms laws was closed so that once any gun owner owns at least five guns that they have to establish a separate and extraordinary reason for owning each additional gun.
"Properly administered this reform would significantly reduce the number of firearms in our community."
How many guns are in your suburb?
2575: Alpine, Aylmerton, Balaclava, Bangadilly, Barrallier, Braemar, Bullio, Colo Vale, High Range, Hill Top, Joadja, Mittagong, Mandemar, Mount Lindsey, Wanganderry, Wattle Ridge, Welby, Willow Vale, Wollondilly, Woodlands and Yerrinbool.
In the 2575 postcode, there are 641 registered firearms owners out of a population of about 14,020. Out of these 641 registered firearms owners, there are 2974, with an average 4.63 registered firearms per registered firearms owner. The largest number of guns held by one registered owner excluding collectors is 124.
2576: Bong Bong, Bowral, Burradoo, East Bowral, East Kangaloon, Glencoe, Glenquarry, Kangaloon, Kelston and Milton Park.
In the 2576 postcode, there are 296 registered firearms owners out of the 12,723 people. There are 1328 registered firearms with an average of 4.48 registered firearms per registered owners. The largest number of guns held by one registered owner excluding collectors is 89.
2577: Avoca, Barren Grounds, Belanglo, Berrima, Box Hill, Burrawang, Buxton, Calwalla, Canyonleigh, Elmwood, Fitzroy Falls, Hoddles Cross Roads, Jellore, Manchester Square, Medway, Meryla, Moss Vale, Mount Murray, Myra Vale, New Berrima, Paddys River, Pheasant Ground, Robertson, Sutton Forest, Werai, Wildes Meadow and Yarrunga.
In the 2577 postcode, there are 829 registered firearms owners out of the 14,635 residents. Of these 829 owners, there are 3612 registered firearms, an average of 4.35 per owner. The highest number of guns held by one registered owner excluding collectors is 69.
In the 2578 postcode, there are 92 registered firearms owners out of 2423 people. There is an average of 4.92 registered firearms per owner, with 453 registered firearms in total. The largest number of guns held by one registered owner is 19.
2579: Boronga, Exeter, Penrose, Rosedale and Wingello.
In the postcode 2579, there are 377 registered firearms owners out of a population of 3598 people. The largest number of guns held by one registered owner is 36, with a ratio of 4.08 guns per registered owner - a total of 1540 registered guns in the postcode.