RANCHO CORDOVA (CBS13) — The City Council on Monday night will weigh in on a ZIP code controversy that has Rancho Cordova officials feeling betrayed by one of their largest employers.

Vice Mayor David Sander will try to stop Aerojet from stamping its new residential development with a Folsom ZIP code instead of Rancho Cordova.

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“We’ve stood through them through thick, through thin, through environmental contamination, through downsizing of their facility,” he tells CBS13’s Koula Gianulias. “And now when they have an opportunity to help us up from the insults they’ve in a way caused, they choose to help another community instead of us.”

Sander suspects the move was made because of higher property values in the neighboring zip code. But an Aerojet spokesman insists it all comes down to mail service and which post office can better accommodate thousands of new homes planned for an unincorporated area.

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“The simple fact is these lands are not in the city of Rancho Cordova, its sphere of influence or in any application for annexation,” spokesman Tim Murphy said. Any map will show just how committed we are to a prosperous future for the City of Rancho Cordova.”

But some locals are still suspicious about Aerojet’s postal plea, which has turned out to be a sensitive issue, perhaps because it’s happened before.

“It’s just like when Gold River didn’t want to be considered Rancho Cordova,” said Rancho resident Dave Struwe.

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The U.S. Postal Service will have the final say in this matter. It is reviewing the request and is expected to make a decision in 30 to 45 days.