Adams County, Colorado: Location, Cities, Administration, Judiciary

Adams County is a major residential, industrial and transportation centre in the northern Denver metropolitan area. It combines densely developed suburbs, established cities, freight and manufacturing corridors, agricultural land, fast-growing eastern communities and extensive unincorporated areas.

Brighton is the county seat and the main location for county administration and courts. Other major communities include Thornton, Commerce City, Northglenn, Federal Heights and portions of Westminster, Aurora and Arvada.

Adams County government operates separately from these municipal governments. It manages courts, elections, property administration, law enforcement, detention, public health, human services, roads, planning, emergency management and parks for more than 554,000 residents.

Quick Overview of Adams County

Adams County’s population increased by 6.8% between the April 2020 estimate base and July 2025. It had approximately 207,345 housing units in 2025 and 188,730 households during the 2020–2024 reporting period.

Location and Geographic Structure

Adams County stretches from the northern Denver suburbs eastward across the Colorado plains. It borders Weld County to the north, Morgan and Washington counties to the east, Arapahoe and Denver to the south, and Jefferson and Broomfield counties to the west.

The western part of the county is heavily urbanised. It includes residential neighbourhoods, industrial districts, shopping areas, medical centres and major transport corridors. Eastern Adams County has more agricultural land, open prairie and lower-density communities.

Important transport routes include:

• Interstate 25
• Interstate 70
• Interstate 76
• Interstate 270
• E-470
• S. Highway 36
• S. Highway 85
• S. Highway 6
• State Highway 2
• State Highway 7
• State Highway 79

The county’s location near Denver International Airport, regional motorways and major freight railways makes it an important centre for distribution, warehousing and manufacturing. The Colorado Air and Space Port near Watkins supports aviation, aerospace and commercial-development opportunities.

Cities, Towns and Unincorporated Communities

Adams County contains all or part of ten incorporated municipalities:

• Arvada
• Aurora
• Bennett
• Brighton
• Commerce City
• Federal Heights
• Lochbuie
• Northglenn
• Thornton
• Westminster

Only parts of Arvada, Aurora, Bennett, Lochbuie and Westminster are located in Adams County. Municipal boundaries therefore cross county lines in several places.

Brighton is the county seat. Thornton is the county’s largest population centre, while Commerce City contains major industrial, logistics and residential areas.

Important unincorporated communities include:

• Henderson
• Strasburg
• Watkins
• Welby
• Derby
• Twin Lakes
• Sherrelwood
• Berkley
• North Washington
• Todd Creek

Municipal governments usually manage local police, fire services, neighbourhood streets, zoning, building permits and parks within their boundaries. Adams County performs many of these local-government functions in unincorporated areas.

Population and Housing

Adams County has a comparatively young and culturally diverse population.

Important demographic figures include:

• Residents under 18: 23.3%
• Residents aged 65 or older: 12.5%
• Hispanic or Latino population: 44.7%
• Black population: 4.8%
• Asian population: 5.4%
• Foreign-born residents: 15.6%
• Veterans: 24,314
• Residents speaking another language at home: 29.3%
• Average household size: 2.79 people

Important housing figures include:

• Owner-occupied housing rate: 68.6%
• Median owner-occupied home value: $484,200
• Median gross monthly rent: $1,781
• Housing units in 2025: 207,345
• Residential building permits in 2025: 2,608

Housing conditions vary across the county. The western suburbs contain established neighbourhoods and apartments, while Brighton, Thornton and eastern areas continue to add large residential developments.

Growth has increased demand for affordable housing, road capacity, drainage, schools, healthcare and emergency services.

Education, Income and Workforce

Approximately 85.2% of Adams County residents aged 25 and older have completed high school, while 29% hold a bachelor’s degree or higher.

Other workforce figures include:

• Civilian labour-force participation: 72%
• Median household income: $94,571
• Per-capita income: $42,206
• Residents below the poverty line: 9.8%
• Average travel time to work: 29.8 minutes

Important educational institutions and training providers include community colleges, technical programmes, public school districts and workforce-development organisations.

The county is served by several independent school districts, including Adams 12 Five Star Schools, Brighton School District 27J, Mapleton Public Schools, Westminster Public Schools and portions of other districts.

School districts have their own elected boards, budgets and legal responsibilities. They are not departments controlled by Adams County government.

Economy and Employment

Adams County has a broad economy supported by transportation access, industrial land, healthcare institutions and proximity to Denver.

Major economic sectors include:

• Logistics and distribution
• Manufacturing
• Construction
• Healthcare
• Retail
• Food production
• Aviation and aerospace
• Energy
• Agriculture
• Professional services
• Public administration

The county had 11,319 employer establishments and approximately 207,227 jobs in 2023. Total annual payroll was about $13.23 billion.

Commerce City and the Interstate 76 corridor support industrial, energy and distribution activity. Thornton, Northglenn and Westminster contain major retail, medical and service employers.

The Anschutz Medical Campus, located in the Adams County portion of Aurora, is a major centre for healthcare, education and medical research. Eastern Adams County continues to attract aviation, logistics and industrial projects.

Agriculture remains important outside the main urban area. Farms and rural land produce crops, livestock and other agricultural products while also preserving the county’s historic connection with farming.

County Administration and Government

Adams County is governed by a five-member Board of County Commissioners. Each commissioner represents a geographic district.

The current Board consists of:

• District 1 and Chair: Julie Duran Mullica
• District 2 and Vice Chair: Kathy Henson
• District 3: Emma Pinter
• District 4: Steve O’Dorisio
• District 5: Lynn Baca

Julie Duran Mullica and Kathy Henson were unanimously selected as chair and vice chair for 2026.

The Board of County Commissioners is responsible for:

• Adopting the annual county budget
• Passing county ordinances
• Approving contracts
• Managing county property
• Establishing administrative policies
• Funding public safety
• Supporting courts and detention
• Planning roads and drainage
• Making land-use decisions
• Appointing the County Manager
• Appointing advisory boards
• Supporting health and human-service programmes

The Board normally conducts its public hearings at the Adams County Government Center, 4430 South Adams County Parkway in Brighton.

County Manager

Dionne Stroter serves as Adams County Manager. She was selected for the permanent position effective 1 July 2025 after previously serving as deputy and interim county manager.

The County Manager is appointed by and accountable to the Board of County Commissioners. She serves as the county’s senior professional administrator.

Her responsibilities include:

• Implementing Board policies
• Managing daily county operations
• Preparing and administering the budget
• Coordinating county departments
• Supervising appointed department directors
• Advising commissioners
• Managing strategic priorities
• Monitoring organisational performance
• Coordinating capital projects
• Supporting emergency operations
• Managing relationships with regional partners

The County Manager oversees more than 2,500 county employees and an annual budget exceeding $800 million.

Jeff Holliday serves as Deputy County Manager and assists with administrative coordination and delivery of county services.

County Budget

The Board of County Commissioners adopted a $876,553,642 budget for 2026.

The budget supports:

• Sheriff and detention operations
• Public works and roads
• Human services
• Public health
• Parks and open space
• Planning and development
• Emergency management
• County facilities
• Information technology
• Community-safety programmes
• Elected county offices

Budget preparation is coordinated by the Budget and Finance Department, County Manager, elected officials and department directors. Final spending authority rests with the Board of County Commissioners.

Other Important Elected Officials

Several Adams County offices are independently elected and do not report to the County Manager in the same way as regular department directors.

1. Assessor

Thomas Swingle serves as Adams County Assessor.

The Assessor’s Office identifies, records and values real estate and qualifying personal property. It also manages valuation notices, exemptions and property-assessment appeals.

2. Clerk and Recorder

Josh Zygielbaum serves as County Clerk and Recorder.

The office is responsible for:

• Elections
• Voter registration
• Recording property documents
• Marriage licences
• Motor-vehicle titles
• Vehicle registration
• Maintaining public records

Court records are maintained by the Colorado Judicial Branch rather than the County Clerk and Recorder.

3. Treasurer and Public Trustee

Alex Villagran serves as Treasurer and Public Trustee.

The office collects and distributes property taxes, manages county funds, processes releases of deeds of trust and administers foreclosure responsibilities assigned by Colorado law.

4. Coroner

Monica Broncucia-Jordan serves as Chief Coroner for Adams and Broomfield counties.

The Coroner’s Office investigates qualifying deaths and determines their cause and manner.

Judiciary and Court System

Adams County is part of Colorado’s 17th Judicial District, which includes Adams and Broomfield counties.

Current judicial leadership includes:

• Chief Judge: Kyle Seedorf
• Court Executive: Patricia Kmitta
• District Attorney: Brian S. Mason

Chief Judge Kyle Seedorf is the administrative head of the judicial district. His duties include case-management oversight, court administration, personnel coordination and ensuring that court operations are conducted efficiently.

The main court facility is the Adams County Justice Center, located at 1100 Judicial Center Drive in Brighton.

1. District Court

District Court handles:

• Felony criminal cases
• Major civil lawsuits
• Divorce and family cases
• Juvenile matters
• Probate
• Mental-health proceedings
• Property disputes
• Other cases assigned by Colorado law

2. County Court

County Court generally handles:

• Misdemeanours
• Traffic matters
• Civil cases within the statutory financial limit
• Small claims
• Protection orders
• Preliminary stages of felony cases

Municipal courts operated by cities handle selected local ordinance and traffic cases.

The District Attorney’s Office, led by Brian S. Mason, prosecutes state criminal cases across Adams and Broomfield counties.

Public Safety and Detention

Gene Claps serves as Adams County Sheriff.

The Sheriff’s Office provides:

• Patrol in unincorporated areas
• Criminal investigations
• County jail operations
• Court security
• Civil-process service
• Emergency response
• Victim assistance
• Specialised law-enforcement services
• Community-safety programmes

Incorporated cities generally operate their own police departments. The Sheriff nevertheless performs countywide responsibilities involving detention, courts and civil enforcement.

Fire protection is provided through municipal departments and independent fire-protection districts. The county’s Office of Emergency Management coordinates preparation, response and recovery for wildfires, severe winter weather, flooding, hazardous incidents and other emergencies.

Public Health and Human Services

The Adams County Health Department is governed by the Adams County Board of Health.

Dr Kelly Weidenbach serves as Executive Director.

The Health Department manages programmes involving:

• Disease monitoring
• Immunisation
• Environmental health
• Maternal and family health
• Public-health nursing
• Emergency preparedness
• Community-health education
• Restaurant and facility inspections

Adams County Human Services administers programmes involving:

• Food assistance
• Medicaid-related eligibility
• Colorado Works
• Child welfare
• Adult Protective Services
• Employment support
• Child-care assistance
• Services for older adults and vulnerable families

The county also works with community organisations to support housing stability, behavioural health and homelessness response.

Roads, Planning and Transportation

Adams County Public Works manages transportation and drainage infrastructure in unincorporated areas.

Its responsibilities include:

• Road maintenance
• Bridge projects
• Snow and ice removal
• Traffic engineering
• Drainage systems
• Stormwater management
• Construction projects
• Right-of-way permits
• Road-safety programmes

Cities maintain most local streets within their boundaries. The Colorado Department of Transportation manages state highways and interstate routes.

Public transport is primarily provided through the Regional Transportation District. Services include buses and commuter rail connecting western Adams County with Denver and other metropolitan communities.

The county’s Community and Economic Development Department manages planning, building permits, development review and code compliance in unincorporated areas.

Parks and Open Space

Adams County manages regional parks, trails and open-space properties.

Important facilities include:

• Riverdale Regional Park
• Riverdale Golf Courses
• Rotella Park
• South Platte River Trail connections
• Open-space and natural-resource areas
• Fairgrounds and community-event facilities

County park rangers support visitor safety, environmental education, wildlife response and conservation. Separate municipal and recreation districts operate additional parks and facilities across the county.

Frequently Asked Questions

Q1. Is Adams County the same government as Brighton or Thornton?

A: No. Brighton and Thornton have their own councils, police departments, planning offices and municipal services. Adams County is a separate government responsible for courts, elections, records and services in unincorporated areas.

Q2. Who currently manages Adams County government?

A: Dionne Stroter is the County Manager and directs the county’s appointed departments. Julie Duran Mullica serves as Board chair, while Kathy Henson serves as vice chair.

Q3. Which office handles property values, deeds and tax payments?

A: The Assessor determines property values. The Clerk and Recorder records deeds and mortgages. The Treasurer and Public Trustee collects property taxes and manages foreclosure-related duties.

Q4. Which court handles a case in Adams County?

A: District Court handles felonies, major civil disputes, family cases and probate. County Court handles misdemeanours, traffic matters, small claims and lower-value civil cases. Municipal courts handle selected city offences.

Q5. Which agency provides police services in unincorporated Adams County?

The Adams County Sheriff’s Office is the main law-enforcement agency for unincorporated communities. Incorporated cities generally operate their own police departments.