The Seasteading Institute says it hopes the floating microcountries will allow for experimentation with new ideas which current governments are too large to try.
Seasteading communication director Joe Quirk says the floating cities create room for "start-up governments".
"When you consider that nearly half the world's surface is a blank slate, unclaimed by existing governments, you see the potential in creating a thousand start-up governments in the sea," he said.
"Seasteading comes from a very Silicon Valley perspective, that basically we don't think 193 national governments represent the range of ideas that 7 billion creative people have produced.
"We think we need a sort of start-up sector for the government, a sort of Silicon Valley of the sea, where 21st century ideas for governance can be tried.