what county is johnstown co in
The current total local sales tax rate in Johnstown, CO is 5.900% .The December 2014 total local sales tax rate was also 5.900% . Johnstown, CO is in Weld County. Johnstown is in the following zip codes: 80534.ohnstown, CO Sales Tax Rate. The current total local sales tax rate in Johnstown, CO is 5.900% . The December 2014 total local sales tax rate was also 5.900% .