Ms Greenberg said Featherston has "always provided a Winz office" since the department was first formed from the merger of Social Welfare and employment agencies in 1998.
"They've been there for over 17 years," she said.
"My understanding is (that) they were reviewing the need to have these offices anyway -- that's part of the mix ... It's a real shame we can't offer those sorts of services in Featherston, when there's such a diverse population."
Ms Greenberg said the office has been closed anyway since the shootings and people have adapted, "but that doesn't mean it hasn't affected them personally".
"It really puts South Wairarapa at a disadvantage, having to travel to Masterton."
The closure of Featherston and the other offices happened after Tully shot dead Peggy Noble, 67, and Leigh Cleveland, 55, in the Ashburton Winz offices on September 1, 2014.
Tully was found guilty on March 9, following a jury trial. His sentencing is pending.