Front Range
Boulder County
Property taxes, marriage licenses, vehicle services, and many public records run through Boulder County. Permits and local rules may sit with a town or city instead, so match the office to the exact address.
Official county shortcuts
Take the task to the office that handles it
These links go straight to the official county or regional office shown. Check that page for current documents, hours, appointments, fees, and address-specific instructions. A city may run its own permit office.
Property tax snapshot
Typical property tax in Boulder County
The average total mill levy across Boulder County was about 92.0 mills for tax year 2023 — above the statewide average of about 81 mills. On a $500,000 home, that comes to roughly $3,048 a year, using Colorado's 2026 residential rules: 7.05% on school mills, and 6.8% on the rest after the local actual-value adjustment.
This is the county average across all tax areas. Your parcel's actual mill levy depends on its exact tax area — a metro or special district can add many mills on top — so confirm the real number with the county assessor.
Sales tax: the state charges 2.9% and Boulder County adds 0.99%, for 3.89% before any city or special district. See Colorado sales tax rates ->
Source: Colorado Division of Property Taxation, 53rd Annual Report (2023) — Average Levies by County.
Incorporated places in this county
These cities and towns touch Boulder County. Some cross a county line. Every name opens a direct place page, and selected places include a fuller local guide.
Get to know Boulder County
The history, land, and character behind the place.
Outdoors and wildfire
Brainard Lake needs a reservation to park, not just an early start
Brainard Lake Recreation Area west of Ward uses a paid timed-entry reservation to park inside the gate during its summer season, with day-use options for those on foot or bike.
Read note ->Outdoors and wildfire
Eldorado Canyon State Park: a tight canyon with a weekend entry plan
Eldorado Canyon State Park near Boulder is a small, busy canyon known for sandstone climbing and creek fishing, and it uses timed vehicle entry on summer weekends.
Read note ->Water and land
Some of Boulder County's tap water starts on the other side of the Divide
Many northern Front Range communities, including parts of Boulder County, receive some of their water from the Colorado-Big Thompson Project, which moves water under the Continental Divide to the eastern slope.
Read note ->Outdoors and wildfire
Eldora: Boulder County's Hometown Ski Mountain
Past Nederland sits Boulder County's only downhill ski area, a compact mountain with surprising bite, a strong Nordic center, and an uncertain new future under possible town ownership.
Read note ->Money and taxes (20)
Money and taxes
A Boulder County value appeal is about the Assessor's value
A Boulder County value appeal challenges the Assessor's number for your parcel, not the whole tax bill, so bring value evidence.
Read note ->Money and taxes
Boulder County property tax starts with two offices
Two Boulder County offices run property tax: the Assessor sets value and exemptions, the Treasurer collects payment.
Read note ->Home and property (20)
Home and property
On the Boulder County foothills edge, defensible space comes before the smoke
Homes along the Boulder County foothills sit in the wildland-urban interface, where creating defensible space around the structure is part of normal ownership.
Read note ->Home and property
In the Boulder County foothills, the creek and the hillside both carry hazard
Steep foothills drainages in Boulder County can produce debris and mud flows in heavy rain, sometimes well beyond the mapped floodplain.
Read note ->Water and land (15)
Water and land
A Boulder County private well starts with a state permit record
A private well's rules live in a state permit, not a county file, so look it up through the Division of Water Resources first.
Read note ->Water and land
A ditch on Boulder County land is not the same as a water right
A ditch crossing your land is a physical feature, not proof you own a right to the water flowing in it.
Read note ->Outdoors and wildfire (19)
Outdoors and wildfire
In the Boulder foothills, bears follow the trash
Black bears are common where Boulder County meets the mountains, and most conflicts trace back to trash and other food smells, so securing attractants is part of living here.
Read note ->Outdoors and wildfire
The Boulder Creek Path is the town's front porch on the water
A 5.5-mile creekside path threads downtown Boulder, the library, and city parks, carrying commuters, tubers, and anglers from the canyon mouth out past 55th Street.
Read note ->Cars and driving (4)
Cars and driving
A Boulder County private car sale may need fresh emissions
A Boulder County private car sale needs the right title, emissions, and paperwork in hand before the buyer can register it.
Read note ->Cars and driving
Boulder County registration renewals usually skip the counter
Routine Boulder County registration renewals go online, by mail, drop box, or kiosk, not over the office counter.
Read note ->Local rules (16)
Local rules
Boulder County land-use rules apply outside the cities and towns
The Boulder County Land Use Code governs unincorporated land only; a parcel inside a city or town starts with that local code instead.
Read note ->Local rules
Short-term rentals in unincorporated Boulder County need a license
Renting a place in unincorporated Boulder County for under 30 days at a time needs a county license first.
Read note ->History and culture (12)
History and culture
Boulder started as a supply town for gold miners in 1859
The city of Boulder began in 1859 as a base where miners outfitted before heading into the mountains, and it took its name from Boulder Creek.
Read note ->History and culture
Boulder County's mountain towns grew up around mining
Many of Boulder County's foothills and mountain communities trace their start to the hard-rock mining era, a story preserved at sites like Nederland and Caribou.
Read note ->Nearby counties
Other Front Range counties — rules, rates, and districts shift across county lines.