The phrase "seaside city" is correct and usable in written English.
You can use it to refer to any city near the ocean. For example, "Portland is a beautiful seaside city in Oregon."
Dili, a ramshackle seaside city, remained calm.
He went to high school at Perth, a seaside city.
People ferreted out her mother's address, in the seaside city of Qingdao, and vandalized their home.
Seaside, city, Clatsop county, northwestern Oregon, U.S., on the Pacific Coast, south of Astoria.
Mr Mottaki also opened a new consulate in the seaside city of Batumi, an increasingly popular destination for Iranian tourists.
She remembers visiting her grandparents in the Israeli seaside city of Ashkelon in 2006.
Meanwhile in Israel, sirens wailed over mostly empty streets in the seaside city of Ashkelon.
Samir, our driver, does both on the way to the seaside city of Lenkoran.
"Rise up!" he beseeched a crowd of thousands crammed last week into a field in this seaside city.
At ski resorts above the seaside city, huge segments of metal piping and cable lie strewn around near hotels.
Often called the Jewel of the Adriatic, this seaside city features marble streets, Renaissance fountains and white sand beaches.
