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Colorado · Denver Metro West · Front Range · #108 Most Populous County in the US
Jefferson County, Colorado
Denver's western mountain-edge county - Lakewood, Arvada, Golden, and the Rocky Mountain foothills. Home to Red Rocks Amphitheatre, the Colorado School of Mines, and the gateway to Evergreen and the Rockies. Property tax, courts, probate, and senior services for Jefferson County residents.
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Jefferson County's assessment ratio means effective tax rates are low — but incorrect appraisals still cost money. Ownwell manages the appeal with no upfront cost.
Shelter Info: Multiple shelter locations; Jefferson County Fairgrounds (Golden); contact OEM; Red Cross Colorado
FEMA Region: Region 8
Notes: Denver western suburban and mountain county; Golden is county seat; wildfire risk (EXTREME – Jefferson County’s wildland-urban interface is one of the most challenging in Colorado; 2020 Cal-Wood Fire, 2020 Lefthand Canyon Fire; ongoing catastrophic risk in mountain communities of Evergreen, Conifer, Morrison, Indian Hills, Kittredge; 2021 Marshall Fire originated in Boulder County but threatened Jefferson County; the Denver Mountain Parks – Red Rocks, Genesee – also have wildfire risk); tornado risk (eastern plains portion); flooding (Bear Creek, Turkey Creek, Clear Creek); hailstorms; avalanche risk in the high terrain; I-70 mountain corridor hazards
Roads & Utilities
ROADS & TRANSPORTATION
County Roads: Jefferson County Public Works – (303) 271-5300
Transit: RTD – West Rail Line (W Line – light rail to Lakewood and Golden; terminus at Jefferson County Government Center/Golden station); bus network; Jeffco Transit (Golden area); mountain community shuttles
Airport: Rocky Mountain Metropolitan Airport (Jefferson/Broomfield border – (303) 271-4850; corporate aviation and charter; general aviation; no commercial service)
Notes: I-70 (east-west through Golden – the gateway to the mountains; extremely congested on ski weekends; US-6 parallels the canyon); I-25 (eastern county); US-285 (southwest corridor to Conifer, Bailey, South Park); US-40 (south through Evergreen and toward Bailey); SR-93 (Golden to Boulder); SR-74 (Evergreen area); Jefferson County’s eastern portion is densely suburbanized (Lakewood, Arvada, Wheat Ridge, Westminster portions, Edgewater); the western portion is mountain resort and rural residential
Business & Permits
BUILDING & PERMITS
Office: Jefferson County Planning and Zoning – (303) 271-8700 | jeffco.us/planning-and-zoning
Services: Unincorporated county permits (very extensive – Evergreen, Conifer, Morrison, Indian Hills, Ken Caryl, Columbine Valley areas – large suburban/mountain market); Golden (separate), Lakewood (Colorado’s seventh-largest city – very active, separate), Arvada (separate – very active), Westminster (portions), Wheat Ridge, Edgewater, Mountain View, Bow Mar, Columbine Valley, Morrison, Lakeside separate
Notes: Jefferson County is one of Colorado’s most active building counties; Lakewood and Arvada are significant growing cities; mountain community development is active; wildfire-resistant construction requirements are increasingly enforced; the Jefferson County Open Space purchase program has limited some development; Red Rocks neighborhood and Genesee area development
Veterans Services
VETERANS SERVICES
Office: Jefferson County Veterans Services – (303) 271-4340
VA Medical: Rocky Mountain Regional VAMC (Aurora – (720) 723-7000); accessible via I-70 and I-225; Golden CBOC; Fort Logan National Cemetery (Denver – Jefferson County/Denver border – one of two national cemeteries in Colorado)
Services: Full range; excellent VA access given proximity to Aurora; Fort Logan National Cemetery; Colorado DVA programming
Notes: Excellent VA access; Fort Logan National Cemetery at the Jefferson/Denver County border is one of Colorado’s most significant veteran memorials; large veteran community in Jefferson County; active VSO chapters; Exempla Lutheran Medical Center (Wheat Ridge) has served veteran health needs; Colorado School of Mines (Golden) has veteran student programs
Libraries
LIBRARIES
System: Jefferson County Public Library (JCPL) – (303) 275-6100 | jeffcolibrary.org; 10 branches; Golden Public Library (city separate); Lakewood Public Library (city separate – extensive); Arvada Center (cultural arts complex with library functions)
Branches: Belmar, Columbine, Conifer, Edgewater, Evergreen, Golden (county branch), Lakewood (county branch), Standley Lake, Wheat Ridge
Services: Books, e-books, public computers, Wi-Fi, genealogy, Colorado history (outstanding), maker spaces, recording studios, digital labs, children’s programs; JCPL is consistently excellent
Notes: JCPL is one of Colorado’s finest county library systems – well-funded, innovative, and with outstanding facilities; the Colorado history and genealogy collections are exceptional; Belmar Library (Lakewood) serves a large urban community; Evergreen and Conifer branches serve the mountain communities; Edgewater’s branch serves a diverse working-class community; Golden’s library (on the Colorado School of Mines campus area) reflects the city’s engineering and scientific culture
Parks & Recreation
PARKS & RECREATION
County Parks: Jefferson County Open Space – (303) 271-5925 | jeffco.us/open-space; 55,000+ acres of open space; one of the finest county open space systems in Colorado and the US; Deer Creek Canyon Park; South Valley Park; Apex Park and Recreation District; North Table Mountain Park; White Ranch Park; Staunton State Park; Elk Meadow Park; Alderfer/Three Sisters Park; Maxwell Falls; Lair O’ the Bear Park; Hildebrand Ranch
State Parks: Chatfield State Park (Jefferson/Douglas County – most visited state park in Colorado); Roxborough State Park (Jefferson/Douglas – red rock wilderness)
Denver Mountain Parks (owned by Denver but in Jefferson County): Red Rocks Park and Amphitheater (the world’s finest outdoor music venue – see Denver County file); Genesee Park; Lookout Mountain (Buffalo Bill Museum and Grave); Echo Lake; Summit Lake on Mount Evans
Federal: Arapaho/Jefferson National Forests; Dinosaur Ridge (Morrison – the world’s most famous dinosaur tracksite visible in roadcut; where the 1877 fossil bones discovery launched one of the most significant paleontological periods in US history)
City: Colorado School of Mines (Golden – one of the finest engineering and science universities in the US; campus overlooking Golden with the “M” on Mount Zion); Buffalo Bill Museum and Grave (Lookout Mountain – the grave and museum overlooking Denver honor the famous showman; the view from Lookout Mountain is one of the finest in the Front Range); Coors Brewery (Golden – one of the world’s largest single-site breweries; free tours available; the Clear Creek valley’s pure water was the original reason for the brewery’s location; Golden was the territorial capital of Colorado in 1862); Clear Creek (excellent whitewater in the Clear Creek Canyon – Class IV-V kayaking; family-friendly tubing in Golden)
Notes: Jefferson County’s recreational assets are extraordinary in their density and quality; Red Rocks Amphitheater (in the Denver Mountain Parks within Jefferson County) is widely considered the world’s finest outdoor music venue; Dinosaur Ridge is genuinely significant – the roadcut along C-470 in Morrison exposes dinosaur bones in situ (right in the rock), visible to any visitor, alongside the famous Stegosaurus tracks and Morrison Formation stratigraphy that changed paleontology; Coors Brewery (now Molson Coors) dominates the Clear Creek valley above Golden with its distinctive brewery smell – free tours include tasting; Lookout Mountain’s Buffalo Bill grave and museum honors the showman with a remarkable panoramic view; Jefferson County Open Space’s 55,000 acres of trails, parks, and wildlife habitat provide exceptional outdoor recreation access for 500,000+ Jefferson County residents
GIS & Maps
GIS & MAPS
GIS Portal: Jefferson County GIS – jeffco.us/gis | (303) 271-5300; DRCOG regional GIS; USGS geological maps; Red Rocks geological mapping; wildfire hazard maps; Jefferson County Open Space trail maps
Notes: Active and well-developed GIS system; wildfire hazard zone mapping is critical; Open Space trail and boundary mapping; Denver Mountain Parks boundary mapping; I-70 traffic and incident monitoring; Dinosaur Ridge geological maps; mountain community parcel and address GIS
Animal Services
ANIMAL SERVICES
Shelter: Jefferson County Animal Control – (303) 271-5070; Foothills Animal Shelter (Golden – (303) 278-7575 | foothillsanimalshelter.org)
Services: Stray intake, adoptions, owner surrenders, spay/neuter, microchipping; wildlife management (mountain lions – very active in mountain communities; black bears; coyotes throughout suburban areas; deer everywhere)
Notes: Mountain lion encounters in Evergreen, Conifer, Indian Hills, and Morrison are regular – the ponderosa pine/mule deer habitat in the foothills is ideal lion territory; Foothills Animal Shelter is a well-regarded humane society; Evergreen Lake wintering bald eagles attract enormous crowds; black bear management is significant in mountain community neighborhoods; coyote management in suburban Lakewood and Arvada is ongoing; Red Rocks Park mountain lion sightings occur regularly
Environmental & Waste
ENVIRONMENTAL / WASTE MANAGEMENT
Solid Waste: Jefferson County – (303) 271-5750; city collection programs; Rocky Flats (federal facility – see below)
Recycling: ColoradoRecycles compliance; active recycling in Lakewood and other cities; mountain community recycling programs; HHW events
Environmental: Colorado DPHE; Bear Creek Watershed Council; Clear Creek watershed; Rocky Flats National Wildlife Refuge (the former nuclear weapons production facility at the Jefferson/Boulder County border; plutonium pit production for US nuclear weapons from 1952-1989; a 1969 fire spread plutonium contamination and there have been ongoing concerns about contamination levels; the site was cleaned up and opened as a wildlife refuge in 2007; the cleanup and post-cleanup monitoring are among the most controversial environmental management decisions in Colorado history); USFS (Arapaho/Jefferson NF)
Notes: Rocky Flats is one of the most controversial environmental management sites in Colorado – the former plutonium pit production facility was cleaned up from 1995-2005 at a cost of $7 billion; the Department of Energy declared it clean and it was opened as a wildlife refuge; however, many scientists and community members argue the cleanup was inadequate and that plutonium contamination levels remain above safe levels for human exposure; the surrounding communities of Arvada, Westminster, and Superior are within the potential exposure zone; ongoing monitoring continues; Jefferson County Open Space’s extensive trail acquisition program has provided the county with extraordinary recreational assets but the land management and wildfire risk in the Open Space is a significant ongoing challenge; Clear Creek canyon’s water quality (affected by historic gold mining in the upper watershed – see Clear Creek County) is an ongoing concern; Jefferson County’s rapid growth creates stormwater management challenges in Bear Creek and other watersheds
About Jefferson County
Jefferson County – known locally as “Jeffco” – is Denver’s western collar, stretching from the urban flatlands of Lakewood and Arvada at Denver’s western edge up into the Rocky Mountain foothills and the Front Range communities of Golden, Evergreen, Conifer, Morrison, and Genesee. The county seat, Golden, is a small historic city at the mouth of Clear Creek Canyon – home to the Colorado School of Mines (one of the world’s leading engineering and applied science universities), Coors Brewing Company (the largest single-site brewery in the world), and the Buffalo Bill Museum and Grave atop Lookout Mountain. Red Rocks Amphitheatre, carved into the geological formations above Morrison, is one of the most celebrated outdoor music venues in the world.
Jefferson County was one of Colorado’s 17 original territorial counties created in 1861. The county’s western terrain includes portions of the Pike National Forest, Arapaho National Forest, the Mount Evans corridor (Mount Blue Sky, recently renamed, reaching 14,265 feet), and numerous Front Range open space parks – reflecting Jefferson County’s historic investment in open space preservation (the county has been purchasing open space since 1972 and now holds over 53,000 acres).
The county’s economy reflects its dual character: suburban Denver services, retail, and healthcare (Exempla Lutheran Medical Center, Children’s Hospital Colorado West) in the flatlands; outdoor recreation, tourism, and mountain-based living in the foothills. County government is a five-member Board of County Commissioners with an elected Assessor, Clerk and Recorder, Sheriff, Treasurer, Coroner, and District Attorney.
All Services
Browse every category and topic available for this county.
Colorado assesses all real property at 100% of actual (market) value and applies a 6.25% residential assessment rate to determine the assessed value for millage rate calculation. Jefferson County’s biennial reappraisal occurs in odd-numbered years – the 2025 reappraisal is based on sales from July 1, 2022 through June 30, 2024. The 2025 values govern both tax years 2025 and 2026. Tax year 2026 is an “intervening year” – only properties with changes (new construction, demolition, change of use) receive a new NOV; all others retain their 2025 value.
The Jefferson County Assessor at 100 Jefferson County Parkway, Golden (303-271-8600) mails Notices of Valuation (NOVs) on or before May 1 of reappraisal years. Jefferson County uses the standard Colorado protest period for its size category – the appeal window is May 1 through June 9. File early; the final days are busy and delays occur.
The appeal process:
File your appeal by June 9 – online, by mail (must be postmarked by June 9), in person, or by phone appointment with an Assessor appraiser. Explain why you believe the value is incorrect and provide comparable sales from within the July 1, 2022–June 30, 2024 study period. The Assessor uses a comparable sales search tool on the Jeffco website – review the sales data used for your property before filing.
The Assessor issues a Notice of Determination (NOD) by August 15. If unsatisfied, appeal to the Jefferson County Board of Equalization (CBOE) by September 15. After the CBOE, choose within 30 days: Colorado Board of Assessment Appeals (BAA), District Court, or arbitration.
Intervening year (2026) appeals: Even in 2026 – when most properties don’t receive a new NOV – property owners may still appeal the 2025 value if they believe it is incorrect. Contact the Assessor’s office for the intervening year appeal procedure.
Senior exemptions:
– Standard Colorado Senior Exemption: Age 65 or older, primary residence, 10+ consecutive years of ownership and occupancy – exempts 50% of first $200,000 of actual value. State reimburses the county. Apply through the Assessor. No income limit.
– Qualified Senior Primary Residence Classification (2025–2026): New Colorado program allowing seniors who moved and lost their prior senior exemption to have it temporarily reinstated. Apply by March 15 (applications accepted through July 15 but without appeal rights after March 15).
– 100% Disabled Veteran Exemption: Also available through the Assessor.
Colorado has no state estate tax and no state inheritance tax. Tax bills mailed January; pay in full by April 30 or in two installments (February 28 and June 16).
OWNWELL CTA: Jefferson County’s 2025 reappraisal covers both 2025 and 2026 – appeal before June 9 to protect two tax years. Senior exemption has no income limit but requires 10 years of ownership and occupancy. Ownwell manages the appeal with no upfront cost.
Recommended
Jefferson County's 2025 reappraisal covers both 2025 and 2026 - appeal before June 9 to protect two tax years. Senior exemption has no income limit but requires 10 years of ownership and occupancy. Ownwell manages the appeal with no upfront cost.
Courts & Legal
Courts & Legal
The Jefferson County District Court at 100 Jefferson County Parkway, Golden (303-271-6145) handles all civil, criminal, family, and probate matters. Probate Court is part of the District Court – contact 720-772-2500. The Jefferson County Clerk and Recorder at the same address (303-271-8168) maintains all land records – deeds, mortgages, and recorded documents – and vital records. Records are searchable at jeffco.us.
Colorado probate is governed by the Colorado Uniform Probate Code (CRS Title 15). Colorado has no state estate tax and no state inheritance tax. Colorado recognizes Transfer on Death deeds for real property. For joint tenancy, recording a certified death certificate removes the deceased owner from title; for tenants in common, probate or legal process is required.
Mountain property considerations: Jefferson County’s foothills and mountain communities have unique property considerations including wildfire risk (Jefferson County is in one of Colorado’s highest wildfire-risk areas), well and septic systems rather than municipal utilities, private road maintenance agreements, and access easements. These factors can affect both assessed value and insurability – document any access, utility, or condition issues when preparing an appeal.
Senior Services: The Jefferson County Department of Human Services – Aging and Adult Services (303-275-2200) and the Denver Regional Council of Governments (DRCOG) Area Agency on Aging (303-480-6700) coordinate senior programming, home-delivered meals, transportation, SHIP Medicare counseling, caregiver support, and connections to Colorado Medicaid long-term care programs. Jefferson County’s Senior Resource Center operates multiple senior centers in Lakewood, Arvada, and Golden.
Marriage & Vital Records
Marriage licenses, divorce records, and birth & death certificates are handled by the following office(s):
CLERK & RECORDER (Deeds, Marriage Licenses, Elections)
100 Jefferson County Pkwy., Golden, CO 80419
(303) 271-8100
Genealogy
County-level record sources
Jefferson County District Court (marriage licenses, will and estate case files – see Probate section above). Gilpin and Jefferson County Vital Records, 800 Jefferson County Parkway, Golden, CO 80419, (303) 271-6450.
Local societies
Foothills Genealogical Society of Colorado, P.O. Box 150382, Lakewood, CO 80215-0382, (303) 935-9192 – covers Clear Creek, Gilpin, Jefferson, and Park Counties as one regional resource.
Columbine Genealogical & Historical Society, Jefferson County, CO
Probate & Estate
Losing someone and having to deal with courts and paperwork at the same time is hard. This section won’t make that easier, but it should tell you what to expect, what it costs, and where to go – so at least you’re not walking in blind.
Where to go
Jefferson Combined Court – District Court (Probate Division) 100 Jefferson County Parkway, Golden, CO 80401 (720) 772-2500 Hours: Monday–Friday, 8:00 a.m.–4:30 p.m.
Step 1: figure out which path applies
Colorado follows the Uniform Probate Code, one of the more streamlined, less court-intensive systems in the country.
Small Estate Affidavit (personal property) – for estates where personal property totals less than roughly $86,000 (twice the “exempt property” amount under C.R.S. § 15-11-403, which adjusts annually for inflation – always confirm the current year’s figure with the court). Available starting 10 days after the death. No court filing required; present the affidavit (Form JDF 999) directly to whoever holds the property.
Summary Administration for small real property – a separate, roughly parallel threshold applies to real property equity. This route does require a court filing.
Informal Probate – the standard path for most estates with a will or clear heirs and no disputes. Handled largely by the court Registrar with minimal hearings.
Formal Probate – required for contested wills, disputed appointments, or complicated estates.
If using the small estate affidavit (personal property)
Wait at least 10 days after the death.
Confirm the fair market value of the decedent’s property (less liens) doesn’t exceed the current statutory threshold, and that no probate has already been opened.
Complete Form JDF 999, Collection of Personal Property by Affidavit.
Present it, along with a certified death certificate, to the bank or institution holding the property – no court filing needed.
If filing for informal or formal probate
File the appropriate application with the Jefferson County District Court: Form JDF 910 (with a will) or JDF 908 (without one). For formal probate, file JDF 920 or the intestate equivalent. Filing fee is $199.
The court (or Registrar, for informal cases) appoints a personal representative and issues Letters Testamentary or Letters of Administration.
In informal probate, the personal representative then manages the estate largely independently.
Creditors have 4 months from first publication of notice to file claims.
The estate closes once debts are paid and assets are distributed.
What it costs
Small estate affidavit: no court filing fee.
Informal or formal probate filing fee: $199.
Personal representative compensation: “reasonable compensation” – no fixed statutory percentage.
No Colorado state estate tax or inheritance tax.
Probate filings, estate administration, and guardianship matters are handled by the following office(s):
Public Safety & Arrests
Arrest records, inmate search, and law enforcement services are handled by the following office(s):
SHERIFF
200 Jefferson County Pkwy., Golden, CO 80401
(303) 271-0211
Elections & Voting
Voter registration, polling locations, and elections information are handled by the following office(s):
CLERK & RECORDER (Deeds, Marriage Licenses, Elections)
100 Jefferson County Pkwy., Golden, CO 80419
(303) 271-8100
Health & Human Services
Offices & Contacts
Health services, social services, and assistance programs are handled by the following office(s):
Health Dept
(303) 232-6301
Human Services
(303) 271-4700
CO Benefits / PEAK
(800) 536-5298
Public Health Information
PUBLIC HEALTH
Office: Jefferson County Public Health – (303) 271-5700 | jeffco.us/public-health
Services: Comprehensive county health department; immunizations; WIC; STI/HIV testing; behavioral health; environmental health; restaurant inspections; wildfire smoke health monitoring
Hospital: St. Anthony Hospital (Lakewood – Level II trauma; major hospital); Exempla Lutheran Medical Center (Wheat Ridge); St. Mary’s Medical Center (Grand Junction); UCHealth Highlands Ranch (southern); Lakewood Kaiser Permanente
Notes: Jefferson County has strong hospital infrastructure; St. Anthony is a major regional hospital with Level II trauma; behavioral health demand is significant in both the mountain communities (isolation, substance use) and the suburban communities; wildfire trauma recovery (mountain community wildfire victims); the mountain communities face unique health challenges from isolation and limited provider access; mountain community EMS response times are long
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