In accordance with the committee's request, the Price Tower in Oklahoma and the Marin County Civic Center in California were removed from the original nomination list of 10.
The other private houses on the list – some of which now function as museums – include the Frederick C Robie House (Illinois), Hollyhock House (California), and the Herbert and Katherine Jacobs House (Wisconsin).
Unity Temple in Oak Park rounds-off the collection of eight projects, which were chosen because they "have figured prominently in shaping the course of architecture". The owners of all the properties are participating voluntarily.
"The collection of Wright buildings represents the first modern architecture nomination from the United States to the World Heritage List," said a statement from The Frank Lloyd Wright Building Conservancy.
The Chicago-based organisation coordinated the revised nomination, which was submitted by the National Park Service on 20 November 2018.
The review is scheduled to be held early July 2019 in Baku, Azerbaijan, during the World Heritage Convention session.
Private organisation International Council of Monuments and Sites (ICOMOS) will recommend whether or not the nomination should be listed, ahead of the committee's decision.
The 150th anniversary of Wright's birth was celebrated across the United States last year. An exhibition of his drawings and models opened at New York's MoMA, while open-house events and parties took place at several of the architect's notable buildings.
Dezeen marked the occasion by profiling his most important projects – the majority of which made the UNESCO nomination, but with others including the Johnson Wax Headquarters and the now-demolished Imperial Hotel in Tokyo.
Main image of Frank Lloyd Wright's Hollyhock House is by Joshua White, courtesy of Anne McCaddon.