| 60 | BT Tower Neodymium U.S. Route 66 |
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| 600x | Boeing 747 |
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| 61 | Promethium Upsilon Andromedae |
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| 618 | Golden ratio |
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| 62 | AK-47 Samarium |
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| 620 | The Magic Flute |
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| 626 | Requiem (Mozart) |
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| 63 | Europium |
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| 639 | Afrikaans Bengali language Dutch language English language Esperanto French language German language Hebrew language Portuguese language Russian language Sanskrit Spanish language |
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| 64 | Commodore 64 Gadolinium Linux StarCraft Super Mario 64 |
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| 64bit | Linux |
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| 64ds | Super Mario 64 |
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| 64x4 | Super Mario 64 |
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| 65 | Cretaceous–Tertiary extinction event Cystic fibrosis Terbium |
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| 6543 | Cat's Eye Nebula |
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| 66 | Arctic Circle Dysprosium U.S. Route 66 |
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| 67 | Holmium The Supremes |
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| 68 | Erbium Normal distribution |
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| 69 | Thulium |
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| 693 | Allosaurus |
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| 6row | Barley |
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| 6th | 6th century Britney Spears George Gordon Byron, 6th Baron Byron James I of England Saturn Symphony No. 6 (Beethoven) Yom Kippur War |
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