1. Numerical data is right-aligned 2. Textual data is left-aligned 3. Headers are aligned with their data 3½. Don’t use center alignment.
Design Better Data Tables
Matthew Ström

Numerical data that you want to compare mathematically should be right-aligned. But numbers that represent categories (SKU, medical code)are often (but not always) easier to scan if left-aligned. Sometimes the leading numbers may be the most significant and the number of digits is not important. Or consider zip codes, where the data may contain standard zip and zip+4 entries. Right alignment would be difficult to scan.

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