FULL ARCHIVE FOR WILLIAM BYRON NUMBER CARDS FROM PREVIOUS SEASONS STARTING IN 2017.
NASCAR
| CUP | XFINITY | TRUCKS | IRACING |
| N/A | 2017 | #9 | N/A | N/A |
| 2018 | #24 | N/A | N/A | N/A |
| 2019 | #24 | N/A | N/A | N/A |
| 2020 | #24 | N/A | N/A | N/A |
| 2021 | #24 | N/A | 2021 | #27 | N/A |
| 2022 | #24 | 2022 | #88, #17 | 2022 | #7 | N/A |
| 2023 | #24 | 2023 | #17 | 2023 | #51 | N/A |
| 2024 | #24 | 2024 | #17 | N/A | N/A |
| 2025 | #24 | 2025 | #17 | 2025 | #07 | N/A |
OPEN WHEEL
| FORMULA 1 | INDYCAR | ||
| N/A | N/A |
OTHER
| ARCA | CLASSICS | LATE MODELS | DIRT SPRINTS |
| N/A | N/A | 2016, 2023, 2024 | N/A |
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