Front Range
Adams County
Property taxes, marriage licenses, vehicle services, and many public records run through Adams 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 Adams County
The average total mill levy across Adams County was about 115.9 mills for tax year 2023 — above the statewide average of about 81 mills. On a $500,000 home, that comes to roughly $3,814 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 Adams County adds 0.75%, for 3.65% 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 Adams County. Some cross a county line. Every name opens a direct place page, and selected places include a fuller local guide.
Get to know Adams County
The history, land, and character behind the place.
Water and land
Along the South Platte in Adams County, irrigation water is its own question
Many older parcels in farming Adams County carry canal or ditch irrigation water that is separate from the household water that comes out of the tap.
Read note ->Outdoors and wildfire
The South Platte Heritage Corridor is Adams County's river spine
A 17-mile South Platte stretch from Commerce City to Brighton, framed around nature, culture, farming, restoration, and recreation.
Read note ->Outdoors and wildfire
The Clear Creek Trail gives southwest Adams County a creek corridor
Clear Creek's Adams County trail runs nine miles from the South Platte confluence toward Sheridan, threading lakes and older neighborhoods.
Read note ->Outdoors and wildfire
Barr Lake near Brighton is one of the Front Range's best birding spots
Barr Lake State Park in Adams County is a Colorado state park known for birds, with a parks pass and a few simple access rules to plan around.
Read note ->Money and taxes (23)
Money and taxes
Adams County property tax starts with two different county offices
Two Adams County offices split the work: the Assessor values and classifies property; the Treasurer bills, collects, and distributes the tax.
Read note ->Money and taxes
An Adams County tax lien certificate is not house keys
Buying a tax lien certificate in Adams County is a recorded lien, not possession, use, access, or improvement rights to the property.
Read note ->Home and property (23)
Home and property
In unincorporated Adams County, check permits before the project starts
The county handles permits for unincorporated Adams County, but cities inside it often run their own building departments.
Read note ->Home and property
An Adams certificate of occupancy is a project finish line
In Adams County a Certificate of Occupancy is the final paper step that marks a permitted space as ready to use.
Read note ->Water and land (18)
Water and land
Adams County private well water should be tested by a certified lab
A private well in Adams County is unregulated and yours to test; clear water proves nothing without a certified-lab result.
Read note ->Water and land
Adams County septic work starts with the Health Department
Septic work in Adams County runs through the Health Department, which reviews the design and permits installs, repairs, and use.
Read note ->Outdoors and wildfire (15)
Outdoors and wildfire
Pelican Ponds is a South Platte open-space stop in Thornton
Pelican Ponds is a 200-acre open space on the South Platte's west bank in Thornton, with trails, fishing, nature play, and disc golf.
Read note ->Outdoors and wildfire
Ken Mitchell gives Brighton a local lake-and-open-space landmark
Ken Mitchell Lake, boardwalk pier, and open space give Brighton a city-scale water landmark of its own, apart from Barr Lake State Park.
Read note ->Cars and driving (18)
Cars and driving
Adams County Motor Vehicle does not issue driver licenses
Adams County Motor Vehicle handles your vehicle record, but driver's licenses and IDs are the state DMV's job, not the county's.
Read note ->Cars and driving
Adams dealer purchases wait for Title Complete before plates
After a Colorado dealer sale, plates wait on the Title Complete Notice — the county issues it once title processing finishes.
Read note ->Local rules (22)
Local rules
In unincorporated Adams County, new oil and gas sites need a county permit too
New oil and gas facilities on unincorporated Adams County land go through the county's own Oil and Gas Facility permit review, in addition to state approval from the Energy and Carbon Management Commission.
Read note ->Local rules
Adams County code complaints start with the city-limit question
Adams County Code Compliance handles weeds, trash, junk, and inoperable vehicles only on zoned land in unincorporated areas, not inside cities.
Read note ->History and culture (23)
History and culture
Brighton's old courthouse explains why the county seat landed there
Adams County split from Arapahoe in 1902 and chose Brighton as its seat in 1904, building the first courthouse at 4th and Bridge.
Read note ->History and culture
Brighton City Museum keeps the local paper trail close to home
Brighton City Museum holds documents, photos, newspapers, maps, and diaries of Adams County history, open for research by appointment.
Read note ->Nearby counties
Other Front Range counties — rules, rates, and districts shift across county lines.