The proposals for 1,461 new homes at Fossetts Farm, which would go alongside a new Southend United football stadium, would be included.
While no planning applications are lodged, residents fear more homes on the land will cause chaos for Southend and Rochford.
Christine Austin, co-founder of the Rochford Supporters group, said: “The infrastructure for our roads is inadequate. It’s rural roads taking on 2021 traffic, they are not capable of taking on more traffic.
“They are trying to elongate London into the suburbs. We need to step up and say ‘no, we can’t do it, it’s impossible’.
“When are they going to stop? I don’t think they will at all. All they’re doing is joining up the dots, but it’s like an urban jungle, there’s no pathways between it.”