Castle Rock, CO Sales Tax Rate
The combined sales tax rate in Castle Rock, Colorado is 8.1% (2.9% state, 1% county and 4.2% city). Calculate the sales tax on any purchase in Castle Rock. Rates effective July 2026.
- State tax
- 2.9%
- County tax (Douglas)
- 1%
- City tax (Castle Rock)
- 4.2%
- Special district tax
- 0%
- Combined rate
- 8.1%