3140 Jefferson St, Boulder, CO 80304 Property Records

Boulder County property record for 3140 Jefferson St, Boulder, CO 80304

Property Summary

Property Type	Single Family Home
Details	2 bd · 1 ba · 1,209 sqft · built 1957
Lot Size	0.155 acres (6,759 sqft)
Owner	2 Individual Names on File
Last Sale	$490,000 (May 2007)
Tax Bill	$6,091 (2025)
Flood Zone	Zone X (minimal risk)
APN	`1463-19-3-16-005`

Property Details

APN / Parcel Number

Primary APN	`1463-19-3-16-005`
Alternative APNs	`R0003998` `0003998`

Interior

Bedrooms	2 Beds
Full Baths	1 Bath
Total Rooms	5 Rooms
Stories	1 Story
Building Area	1,209 sqft Living Area
Gross Area	2,366 sqft
1st Floor Area	1,040 sqft
Basement Area	1,040 sqft
Finished Basement	169 sqft
Unfinished Basement	871 sqft
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 1957
Effective Year Built	Effective 1973
Architectural Style	Ranch
Exterior Material	Brick Veneer
Construction Type	Masonry / Concrete Block
Roof Material	Asphalt
Lot Area	6,759 sqft (0.155 acres)
Garage Type	Attached
Garage Area	286 sqft
Parking Spaces	1 Parking Space
Porch	Porch
Porch Area	286 sqft
Patio Area	100 sqft

Utilities, Heating & Cooling

Heating System	Forced Air with A/C

Location & Zoning

Account Number	R0003998
Street Address	3140 JEFFERSON ST
City	BOULDER
State	CO
Zip	80304-2639
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 5 LESS W 2 FT BLK 1 BONSALL
Legal Range	70
Legal Township	1N
Legal Section	19
Legal Subdivision	BONSALL - BO
Legal Block	1
Legal Lot Number	5
Jurisdiction	BOULDER CO
Township / Civil Division	BOULDER
Census Block Group	2
Census Block	2009
Census Tract	12106

Owner

Source: Boulder County records · APN 1463-19-3-16-005

Assessment roll updated June 15, 2026 · Last verified June 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record	2 Individual Names on File
Mailing Address	3140 JEFFERSON ST, BOULDER, CO 80304-2639
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Last Sale	May 01, 2007 · Amount on Record
Deed Sale	May 01, 2007 · Amount on Record
Prior Sale	Jul 19, 2001 · Amount on Record
Deed Document Number	20072852816
Last Transfer Date	Mar 06, 2020
Transfer Doc	0003777992
Record Updated	Sep 20, 2026

Tax Assessment & Valuation

Source: Boulder County records · Assessment roll updated June 15, 2026 · Last verified June 2026

Property Jurisdictions

Type	Name
State	Colorado
County	Boulder County
Municipality	Boulder City
Unified School District	Boulder Valley School District RE-2 (PK - 12)

Tax Bill & Assessment History

Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$68,592 (+8.8%) Land $58,045 Building $10,547	$1,008,700 (-) Land $853,600 Building $155,100
2025	$6,091.00 (+3.84%)	$63,044 (-10.89%) Land $53,350 Building $9,694	$1,008,700 (-4.47%) Land $853,600 Building $155,100
2023	$5,866.00 (+15.61%)	$70,745 (+31.4%) Land $56,494 Building $14,251	$1,055,900 (+36.3%) Land $843,200 Building $212,700
2022	$5,074.00	$53,841 Land $42,645 Building $11,196	$774,700 Land $613,600 Building $161,100

Flood & Wildfire

Source: FEMA National Flood Hazard Layer as of October 14, 2026 · FEMA NFIP claims and policies as of September 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026

Flood

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on Record median of 50 policies
Community Rating System	Class 5 (25% premium discount)
Nearby Flood Policies	50 in force
Nearby Flood Claims	3 (2013)
Claims Outside the SFHA	3 of 3
Most Recent Claim	Sep 2013 · Severe Storms, Flooding, Landslides, And Mudslides
Claims by Event	Severe Storms, Flooding, Landslides, And Mudslides, Sep 2013 · 3 claims

Wildfire

Wildfire Risk	Low lower than 80% of the US · lower than 91% of Colorado
Wildfire Likelihood	0.01% annual chance
Exposure	Direct burnable vegetation at the parcel

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Internet Providers

Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026

Provider	Max Down / Up (Mbps)
Ayva Fixed Wireless	2,500 / 2,500
Xfinity Cable	2,000 / 250
Verizon Fixed Wireless	300 / 20
Live Wire Networks Fixed Wireless	250 / 100
Lumen Technologies DSL · Fiber in parts of the area	140 / 20
T-Mobile USA Fixed Wireless	100 / 20
AT&T Fixed Wireless	100 / 20

Based on FCC filings for 483 locations within half a mile of this property.

Drinking Water

Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026

Water System	CITY OF BOULDER serves 166,080 people
Water Source	Surface water
Last State Inspection	Sep 2024
Lead	2 ppb (2023–2025) action level 15 ppb

Violations Reported to EPA

Water Quality	Haloacetic acids resolved · Jul 2017
Treatment and Procedure	None last 10 years
Monitoring and Reporting	1 last 3 years

Results are for the whole water system as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.