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

Arapahoe County is one of Colorado’s largest population, employment and government centres. It stretches from established communities in the southern Denver metropolitan area to fast-growing eastern suburbs, small towns, agricultural land and open plains near the county’s eastern boundary.

Littleton is the county seat and the location of the main county administration building. Aurora is the county’s largest city and contains major residential districts, Buckley Space Force Base and the Anschutz Medical Campus. Centennial, Englewood, Greenwood Village, Sheridan, Glendale and several smaller municipalities are also important parts of the county.

Arapahoe County is governed by a five-member Board of County Commissioners. Unlike counties with an elected executive or an appointed county manager, the Board itself serves as the county’s legislative, governing and administrative body. Independent elected officers manage property assessment, elections, records, law enforcement, tax collection, death investigation and criminal prosecution.

Quick Overview of Arapahoe County

Arapahoe County’s population was estimated at 673,820 in July 2025, representing growth of approximately 2.9% from the April 2020 estimates base. The county contained an estimated 277,485 housing units in 2025 and reported 257,232 households during the 2020–2024 period.

Location and Geographic Structure

Arapahoe County occupies a long east–west corridor in north-central Colorado. The western section is closely integrated with Denver and contains most of the county’s population, housing, employment and transport infrastructure. The central section includes Aurora, Centennial and rapidly developing areas around E-470. Farther east, the landscape changes to agricultural land, ranches, energy facilities, small towns and sparsely populated plains.

Denver and Adams County lie along much of the northern boundary. Douglas County is to the south-west, Elbert County is to the south and Washington and Lincoln counties meet parts of the eastern and south-eastern boundary. The county’s irregular western boundary reflects the development of Denver and the creation or expansion of several municipalities.

• Important geographic and development areas include:
• Littleton, Englewood, Sheridan and the South Platte River corridor
• Greenwood Village, Cherry Hills Village and the Denver Tech Center area
• Centennial and the Interstate 25–E-470 corridors
• Aurora and the Interstate 225 corridor
• The Anschutz Medical Campus and Fitzsimons Innovation Community
• Buckley Space Force Base and surrounding eastern Aurora
• Bennett, Deer Trail and the Interstate 70 corridor
• Unincorporated eastern plains, farms and rural residential areas
• Open-space, creek and trail corridors including the High Line Canal and Cherry Creek system

Interstate 25 is the principal north–south route through the county’s western employment centres. Interstate 225 connects Aurora with Interstate 25 and Interstate 70, while E-470 serves eastern Centennial and Aurora. Interstate 70 crosses the northern and eastern plains towards Bennett and Deer Trail. Other important routes include U.S. Highway 285, State Highway 83, Parker Road, Arapahoe Road, Hampden Avenue, Smoky Hill Road, Quincy Avenue and Gun Club Road.

Cities, Towns and Unincorporated Communities

Arapahoe County contains all or part of 13 incorporated cities and towns:

• Aurora
• Bennett
• Bow Mar
• Centennial
• Cherry Hills Village
• Columbine Valley
• Deer Trail
• Englewood
• Foxfield
• Glendale
• Greenwood Village
• Littleton
• Sheridan

Several municipalities cross county boundaries. Aurora extends into Adams and Douglas counties, Bennett extends into Adams County, Bow Mar extends into Jefferson County and Littleton extends into Douglas and Jefferson counties. Residents should therefore confirm the county and city responsible for a property rather than relying only on its mailing address.

Incorporated municipalities generally operate their own councils, planning systems, building departments, neighbourhood streets, parks and code-enforcement programmes. Police arrangements vary. Aurora, Englewood, Glendale, Greenwood Village and Littleton operate municipal police departments, while Centennial contracts with the Arapahoe County Sheriff’s Office for law-enforcement services.

Unincorporated Arapahoe County includes suburban neighbourhoods near established cities as well as large rural areas east of Aurora. The county provides land-use planning, building review, road and bridge services, code enforcement and sheriff coverage in these areas. A Centennial, Aurora, Littleton or Englewood postal address does not always mean that a property is within that city’s legal boundary.

Population and Housing

Arapahoe County has a diverse and increasingly urban population. Approximately 22.1% of residents are under 18, while 15.6% are aged 65 or older. Around 24.3% identify as Hispanic or Latino, 11.9% as Black or African American and 7.5% as Asian. Approximately 16.5% of residents are foreign-born.

• Important housing and income figures for 2020–2024 include:
• Owner-occupied housing rate: 64.7%
• Median owner-occupied home value: $561,200
• Median gross monthly rent: $1,891
• Median monthly owner cost with a mortgage: $2,423
• Median household income: $101,087
• Per-capita income: $53,774
• Residents living below the poverty line: 7.8%
• Mean journey to work: 27.1 minutes
• Housing units in 2025: 277,485
• Residential building permits issued in 2025: 3,599

Housing ranges from apartments and older neighbourhoods in Englewood, Littleton and Aurora to planned subdivisions, townhouses, luxury communities, rural residences and farm properties. Continued population growth has increased demand for affordable housing, transport capacity, water and sewer infrastructure, schools, public safety and social services.

Growth patterns differ sharply across the county. Much of western Arapahoe County is already developed, while areas around E-470 and eastern Aurora continue to add homes and employment centres. The eastern plains require a different planning approach because of longer emergency-response distances, limited infrastructure, agricultural activity and dependence on groundwater and rural roads.

Economy and Employment

Arapahoe County has one of Colorado’s largest and most varied local economies. Major sectors include aerospace and defence, healthcare, bioscience, professional services, information technology, finance, retail, hospitality, logistics, construction, education, government and advanced manufacturing.

The county recorded 20,137 employer establishments and 321,810 jobs in 2023. Annual payroll exceeded $24.5 billion. Retail sales reached approximately $15.41 billion in 2022, while healthcare and social assistance organisations generated about $6.90 billion in receipts or revenue.

• Important economic and institutional assets include:
• The Denver Tech Center and surrounding Greenwood Village–Centennial business districts
• Anschutz Medical Campus and Fitzsimons Innovation Community
• UCHealth University of Colorado Hospital and Children’s Hospital Colorado
• Swedish Medical Center and other South Metro healthcare facilities
• Buckley Space Force Base and the regional aerospace and defence sector
• Centennial Airport and aviation-related businesses
• Aurora, Centennial, Englewood and Littleton retail and commercial centres
• Interstate 70, Interstate 225 and E-470 logistics and distribution corridors
• Arapahoe Community College and Community College of Aurora
• Construction, engineering and professional-service firms

Healthcare and bioscience are particularly important because the Anschutz–Fitzsimons area combines hospitals, university medical programmes, research organisations and innovation companies. Aerospace and defence employment is supported by Buckley Space Force Base, defence contractors and aviation businesses around Centennial Airport.

The county’s western communities are closely connected to the wider Denver labour market. Eastern communities also support agriculture, transportation, energy, construction and small businesses. Arapahoe/Douglas Works! provides workforce services to job seekers and employers across the region.

County Administration and Government

Arapahoe County is a statutory Colorado county governed by a five-member Board of County Commissioners. Each commissioner represents a geographic district and is elected to a four-year term. The Board acts as the county’s legislative, governing and administrative body rather than operating under a separate elected executive.

The current commissioners and 2026 Board officers are:

• District 1: Carrie Warren-Gully
• District 2 and finance officer: Jessica Campbell
• District 3 and chair pro tem: Jeff Baker
• District 4 and chair: Leslie Summey
• District 5: Rhonda Fields

The Board adopts the annual budget, approves contracts and county resolutions, manages land-use decisions in unincorporated areas, acts as the County Board of Equalization and appoints residents to advisory boards and commissions. It also hires department directors and the management team for departments that are not controlled by independently elected officials.

Colorado counties can exercise only the authority granted by the state constitution and state law. Municipal governments remain responsible for many local services within city limits, while independent fire, water, sanitation, school, recreation and metropolitan districts provide additional services throughout the county.

Administrative Leadership

Arapahoe County does not use a conventional county-manager or county-executive system. Administrative authority is shared by the Board of County Commissioners, the Commissioners’ Office, department directors and independently elected constitutional officers. The Board therefore remains directly responsible for broad administrative policy and departmental oversight.

Michelle Halstead serves as Director of the Commissioners’ Office. The office supports Board meetings, policy coordination, public information, legislative work, communications and administrative services. The director is not a county manager with independent authority over every county office.

Major county departments and administrative areas include:

• Finance and budget administration
• Public Works and Development
• Human Services
• Public Health
• Community Resources
• Open Spaces
• Facilities and Fleet Management
• Human Resources
• Information Technology
• Emergency Management
• County Attorney and civil legal services
• Communications and administrative services

The county’s adopted 2026 budget totals approximately $667.5 million. Its principal priorities include public safety, roads and bridges, housing, health and human services, staffing, capital maintenance and long-term financial reserves.

Other Important County Officials

Current elected and appointed office-holders include:

• Assessor: PK Kaiser
• Clerk and recorder: Joan Lopez
• Coroner: Dr. Casey P. Bitting
• District attorney: Amy Padden
• Sheriff: Tyler Brown
• Treasurer and public trustee: Michael R. Westerberg
• Interim county attorney: John Christofferson

Assessor PK Kaiser discovers, classifies and values taxable real and personal property. Treasurer and Public Trustee Michael Westerberg collects property taxes, distributes revenue to taxing authorities and performs statutory public-trustee functions involving deeds of trust and foreclosures.

Clerk and Recorder Joan Lopez administers elections and voter registration, records deeds and other permanent documents and provides motor-vehicle and licensing services. Sheriff Tyler Brown leads the Sheriff’s Office, including patrol, detention, civil-process, investigations, emergency communications and contracted law-enforcement services.

District Attorney Amy Padden leads criminal prosecution for Colorado’s 18th Judicial District, which has consisted only of Arapahoe County since January 14, 2025. The County Attorney’s Office is separate from the District Attorney and handles civil legal advice, county litigation, contracts, land-use matters and representation of Human Services.

Dr. Casey P. Bitting was appointed county coroner in June 2026 and took office on July 2, 2026. The Coroner’s Office investigates qualifying deaths, determines cause and manner of death and performs forensic pathology and medicolegal functions.

Judiciary and Court System

Arapahoe County forms Colorado’s 18th Judicial District. The district was established in 1962 and formerly included Douglas, Elbert and Lincoln counties. Those three counties entered the new 23rd Judicial District on January 14, 2025, leaving the 18th Judicial District focused entirely on Arapahoe County.

Judge Michelle Amico serves as chief judge. Jenni Turnidge serves as court executive, Audrey Smith as deputy court executive and Shana Kloek as clerk of court and registrar. The judicial district has district court judges, county court judges and magistrates, with two principal court locations.

The main court facilities are:

• Arapahoe County Justice Center, 7325 South Potomac Street, Centennial
• Arapahoe County Courthouse, 1790 West Littleton Boulevard, Littleton
• District Court has general jurisdiction over:
• Felony criminal cases
• Major civil disputes
• Divorce, child custody and family-law matters
• Probate, estate and guardianship proceedings
• Juvenile matters
• Mental-health and civil-commitment proceedings
• Appeals and other cases assigned by Colorado law

County Court generally handles misdemeanours, traffic offences, small claims, lower-value civil cases, evictions and protection-order matters. Municipal courts in Aurora, Englewood, Glendale, Greenwood Village, Littleton and other cities hear qualifying ordinance violations and municipal cases.

The Clerk of Court maintains judicial records and accepts filings, but it is part of the Colorado Judicial Branch rather than the Arapahoe County Clerk and Recorder’s Office. Residents requesting court documents should therefore contact the state court system, not the county recording division.

Public Safety and Emergency Services

The Arapahoe County Sheriff’s Office is the principal law-enforcement agency for unincorporated areas. It also provides countywide detention, civil-process, warrant, court-security, emergency-communications and investigative functions. The City of Centennial contracts with the Sheriff’s Office for municipal law-enforcement services.

Other incorporated cities maintain their own police departments or local arrangements. Fire protection and emergency medical response are provided through municipal fire departments and independent fire protection districts, including large regional agencies serving the western and suburban portions of the county.

• Important emergency-planning hazards include:
• Severe thunderstorms, hail and tornadoes
• Flash flooding and drainage emergencies
• Grass fires and wildland–urban interface fires
• Winter storms, extreme cold and blizzards
• Extreme heat and poor air quality
• Hazardous-material and industrial incidents
• Transport and aviation emergencies
• Public-health emergencies and disease outbreaks

Emergency Management coordinates preparedness, public warning, continuity planning and disaster response with municipalities, fire districts, hospitals, school systems, state agencies, utilities and community organisations. The contrast between dense urban areas and remote eastern plains requires different emergency-response and communications strategies.

Infrastructure, Transport and Public Services

Arapahoe County Public Works and Development provides planning, engineering, building, road, bridge, stormwater, floodplain and code-enforcement services. Its land-use and building authority generally applies to unincorporated Arapahoe County rather than incorporated municipalities.

Major county responsibilities and services include:

• Road, bridge, drainage and traffic-system maintenance in county jurisdiction
• Planning, zoning and subdivision review in unincorporated areas
• Building plan review, permits and inspections in unincorporated areas
• Floodplain, stormwater and environmental regulation
• Human Services and child- and adult-protection programmes
• Public-health clinics, disease control and environmental health
• Housing, workforce, veteran and older-adult services
• Open-space acquisition, trails and recreation grants
• Elections, motor-vehicle services and recorded documents
• Property assessment and tax collection
• Emergency management, detention and sheriff services

The county’s transport network is shared among Arapahoe County, municipalities, the Colorado Department of Transportation, E-470 Public Highway Authority and the Regional Transportation District. RTD light-rail and commuter-rail services connect portions of Aurora, Centennial, Englewood, Greenwood Village and Littleton with Denver and other metropolitan destinations.

Centennial Airport is a major general-aviation airport serving corporate, charter, training, medical and private aviation. Denver International Airport, located immediately north of the county in the City and County of Denver, is the principal commercial passenger airport for residents and businesses.

Arapahoe County Public Health began operating as a standalone county department in 2023. It provides communicable-disease control, immunisation, maternal and family health, environmental health, food safety and community-health programmes. Open Spaces supports parks, trails, conservation projects and municipal grants through voter-approved funding.

Frequently Asked Questions

Q: How can a resident confirm whether an address is inside a city or in unincorporated Arapahoe County?

A: A mailing address may use Aurora, Centennial, Littleton or another city name even when the property is outside that city’s legal boundary. Residents can use the county address and parcel information system to confirm the municipality, commissioner district, taxing authorities and service jurisdiction before requesting a permit or reporting a road or code problem.

Q: Who issues a building permit in Arapahoe County?

A: An incorporated city or town normally issues permits within its own boundaries. Arapahoe County Public Works and Development handles building permits, inspections, zoning and land-use matters in unincorporated areas. The responsible office therefore depends on the property’s legal jurisdiction.

Q: Are property valuation and property-tax collection handled by the same office?

A: No. The Assessor’s Office determines the taxable value and classification of property. The Treasurer and Public Trustee collects property taxes and distributes the money to the county, schools, cities and towns and special districts.

Q: Where should someone request Arapahoe County court records?

A: Court records are maintained by the Clerk of Court within the Colorado Judicial Branch. They are not maintained by the elected Arapahoe County Clerk and Recorder, whose responsibilities include elections, recorded property documents, licences and motor-vehicle services.

Q: Does Arapahoe County have a county manager?

A: No conventional county manager or elected county executive directs the entire government. The five-member Board of County Commissioners is the governing and administrative body. Department directors manage daily operations, while independent elected officials control their own statutory offices.