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Box 20 on your W-2 form is for the name of the locality associated with the local wages, tips, etc. reported in box 18 and the local income tax reported in box 19. If there's a value in box 20, it's usually a city or county name.

When you're filling out your tax return, you'll need to report the local income tax amount from box 19 on the appropriate line of your return. The name in box 20 helps you identify which local tax jurisdiction the taxes were paid to. If you're using tax software, it will guide you where to input this information. If you're filling out the forms manually, you'll need to check your state and local tax instructions to see where to report this.