Williamson, IL Sales Tax Rate

The combined sales tax rate in Williamson, Illinois is 6.6% (6.25% state and 0.35% city). Calculate the sales tax on any purchase in Williamson. Rates effective January 2009.

State tax

6.25%

County tax (Madison)

0%

City tax (Williamson)

0.35%

Special district tax

0%

Combined rate

6.6%

Source: Illinois Department of Revenue, sales tax rate files incl. address addendum (effective Aug 1, 2026). Effective January 2009.