Vado in Roma instead of vado a Roma might sound like a small slip, but to a native speaker it sounds distinctly off. Here’s the rule that settles it — and it applies far beyond just Rome.
It’s vado a Roma. Cities always take the preposition a, never in.
The rule splits cleanly by size of place: cities use a, countries and regions use in.
Islands split by size too, but the other way round from what you might expect: small islands take a, large islands take in.
Three specific places always take a, with no exceptions: casa (“home”), scuola (“school”), and teatro (“theatre”).
A longer list of everyday places also uses a — but combined with the definite article, so you’ll usually see it contracted: al ristorante, al bar, al supermercato, al mercato, al cinema, alla stazione, alla posta, all’aeroporto, al lavoro, al mare (“to the restaurant, the bar, the supermarket, the market, the cinema, the station, the post office, the airport, work, the beach”).
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Some very common places genuinely don’t follow the city/country logic above, and just need to be memorized:
There’s no shortcut here — these are worth learning as fixed phrases rather than trying to derive them from a rule.
Once you’ve got the city/country split down, the rest is mostly a matter of memorizing the handful of exceptions.
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