Sales tax in Douglas County, Colorado
There is no single sales tax rate in Douglas County. It runs from 4% to 8.75% depending on the exact address, because cities and special districts inside the county levy their own on top of the 2.9% state rate. The 2.9% state rate applies everywhere in the county; everything above that depends on where you are standing. These rates were read from Colorado's own published schedule and checked on September 9, 2026. The rate in each of the 7 cities is in the table below.
What is the sales tax rate in Douglas County?
| Colorado state rate | 2.9% |
|---|---|
| Douglas County rate | 1% |
| Lowest combined rate in the county | 4% |
| Highest combined rate in the county | 8.75% |
The combined figures are the lowest and highest totals anywhere in Douglas County, so the rows above do not add up to them.
What is the sales tax rate in each city in Douglas County?
Colorado publishes the rate for every city it taxes. These are the combined rates, state and local together, as listed in Colorado's own rate file. Where a city shows a range, a special district covers only part of it, so the rate depends on the exact address.
| City or community | July 1 to December 31, 2026 |
|---|---|
| Aurora | 8.75% |
| Castle Pines | 7.75% |
| Castle Rock | 8.1% |
| FranktownThe rate depends on the address, from 4% to 5%: 4% with Scientific and Cultural Facilities District sales tax (0.1%); 5% with Regional Transportation District sales tax (1%) and Scientific and Cultural Facilities District sales tax (0.1%). | 4% to 5% |
| Highlands RanchThe rate depends on the address, from 4% to 5%: 4% with Scientific and Cultural Facilities District sales tax (0.1%); 5% with Regional Transportation District sales tax (1%) and Scientific and Cultural Facilities District sales tax (0.1%). | 4% to 5% |
| Larkspur | 7.9% |
| Lincoln Station Local Improvement District (Littleton mailing area)No city sales tax of its own. | 5.5% |
| LittletonThe rate depends on the address, from 7.75% to 8.75%: 7.75% with a 3.75% city tax and Scientific and Cultural Facilities District sales tax (0.1%); 8.75% with a 3.75% city tax, Regional Transportation District sales tax (1%) and Scientific and Cultural Facilities District sales tax (0.1%). For part of Littleton the state's file prints 7%, using an out of date city rate; Littleton's own tax page gives the city rate that makes it 7.75%, which is the figure shown here. | 7.75% to 8.75% |
| Lone TreeThe rate depends on the address, from 7.8125% to 8.31%: 7.8125% with a 2.8125% city tax, Regional Transportation District sales tax (1%) and Scientific and Cultural Facilities District sales tax (0.1%); 8.31% with a 2.81% city tax, Regional Transportation District sales tax (1%), Scientific and Cultural Facilities District sales tax (0.1%) and Local Improvement District sales tax (0.5%). The town of Lone Tree's own page gives a 2.5% city sales tax rate, which would make its combined rate 7.5% (8% in the local improvement district code). The state file's City component is 2.8125% (2.81% in the local improvement district code), for a combined 7.8125% to 8.31% here. Lone Tree is self collected home rule, so the state reports this rate but does not set it; one of the two sources is stale. | 7.8125% to 8.31% |
| LouviersNo city sales tax of its own. | 4% |
| ParkerThe rate depends on the address, from 7% to 8%: 7% with a 3% city tax and Scientific and Cultural Facilities District sales tax (0.1%); 8% with a 3% city tax, Regional Transportation District sales tax (1%) and Scientific and Cultural Facilities District sales tax (0.1%). | 7% to 8% |
| SedaliaNo city sales tax of its own. | 4% |
| Unincorporated Douglas CountyThe rate depends on the address, from 4% to 5.5%: 4% with Scientific and Cultural Facilities District sales tax (0.1%); 5% with Regional Transportation District sales tax (1%) and Scientific and Cultural Facilities District sales tax (0.1%); 5.5% with Scientific and Cultural Facilities District sales tax (0.1%) and Health Services District sales tax (1.5%). | 4% to 5.5% |
Source: Colorado rate file for July 1 to December 31, 2026, from Colorado's official rate page.
How much sales tax is that on a purchase in Douglas County?
At 4%, a $100 purchase carries $4.00 in sales tax and a $1,000 purchase $40.00, at the lowest rate in the county. At the highest, 8.75%, the same purchases carry $8.75 and $87.50. That is general merchandise; Colorado taxes some categories, often groceries, differently, as the note below explains.
Among Colorado's 64 counties, Douglas County's lowest rate ranks 39th highest. See every Colorado county.
Sales tax in counties next to Douglas County
Douglas County borders 5 counties. The lowest rate next door is 3.25% in Arapahoe County, CO, which is $7.50 less on a $1,000 purchase than the lowest rate in Douglas County.
| County | Combined sales tax |
|---|---|
| El Paso County, CO | 5.13% to 9.03% |
| Jefferson County, CO | 4.5% to 8.75% |
| Douglas County, CO (this county) | 4% to 8.75% |
| Elbert County, CO | 3.9% to 7.9% |
| Teller County, CO | 3.9% to 8.4% |
| Arapahoe County, CO | 3.25% to 8.05% |
Why the rate here is not the whole story
Colorado charges 2.9 percent statewide and then stacks a county rate, city rates and special district rates whose boundaries do not follow county lines, so a single rate for the whole county does not exist. The county itself levies 1 percent countywide. The floor of 4 percent is at Franktown, where the Scientific and Cultural Facilities District also applies. The ceiling of 8.75 percent is at Aurora, on top of the Regional Transportation District and the Scientific and Cultural Facilities District. That ceiling is set by a self collected home rule jurisdiction, which administers its own sales tax and can change it on a date the state file does not carry, so confirm it with the jurisdiction or the state lookup before charging it.
How do I find the exact rate for an address in Douglas County?
Use Colorado's own address lookup. In Douglas County the rate depends on the address, anywhere from 4% to 8.75%.
Who has to collect sales tax in Douglas County?
Any seller with a physical presence in Colorado collects at the rate for the address of the sale; a remote seller does once it passes Colorado's economic nexus threshold. Colorado sales tax covers the statewide rules and what is exempt.
Work out your own numbers
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Sales tax calculator
Tax on a specific purchase at this county's rate, and the total you will actually pay.
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Do you have to collect?
Whether your sales into Colorado cross its economic nexus threshold. A different question from the rate.
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Property tax in Douglas County
The other local tax: effective rate and median bill for this county.
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Sales tax by county
Every US county, and how Colorado compares with the rest of the country.
Sources
- Douglas County rates: Colorado Department of Revenue, DR 1002 Colorado Sales/Use Tax Rates combined with DR 0800 jurisdiction codes, Colorado_Jurisdiction_Codes_Rates_July-Dec2026.xlsx, edition effective July 1 2026 through December 31 2026, https://tax.colorado.gov/sites/tax/files/documents/Colorado_Jurisdiction_Codes_Rates_July-Dec2026.xlsx
- Collected and verified September 9, 2026. Confidence: P on the rate components, S on the range (P read on a primary agency page, S strong but indirect, U unverified).