304 may refer to:

• The year 304 or the year 304 BC.
• Area code 304, in West Virginia
• 304 (number), the natural number
• 304 (card game), a card game popular in Sri Lanka and Tamil Nadu
• 304 Olga, a main-belt asteroid
• Peugeot 304, a small family car
• SAE 304 stainless steel, the most common type of stainless steel,
• HTTP 304
• 304, a fictional class battlecruiser in the Stargate series.
• 0304 (with intentional leading zero), an album by Jewel
• "304 woman," a slang term meaning a promiscuous woman. When 304 is typed into a hand-held calculator then turned upside down, the symbols resemble the word "hoe", which is an American term for a whore.
• Rocafonda, a neigbourhood in Mataró with the postcode 08304 . Footballer Lamine Yamal celebrates goals by gesturing the number 304 to recognise the neighbourhood.

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