4423 Maxwell Ave, Longmont, CO 80503 Property Records

Boulder County property record for 4423 Maxwell Ave, Longmont, CO 80503

Property Summary

Property Type	Single Family Home
Details	4 bd · 3 ba · 3,137 sqft · built 2018
Lot Size	0.114 acres (4,979 sqft)
Owner	2 Individual Names on File
Last Sale	$689,872 (Mar 2019)
Tax Bill	$5,890 (2025)
Deeds & Mortgages	Mar 2019 Sale Mar 2019 Sale + 1 more
Flood Zone	Zone X (minimal risk)
APN	`1315-18-3-14-017`

Property Details

APN / Parcel Number

Primary APN	`1315-18-3-14-017`
Alternative APN	`R0607895`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Total Rooms	8 Rooms
Building Area	3,137 sqft Living Area
Gross Area	3,741 sqft
1st Floor Area	1,729 sqft
Basement Area	1,552 sqft
Finished Basement	1,408 sqft
Unfinished Basement	144 sqft
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 2018
Effective Year Built	Effective 2018
Architectural Style	Duplex Single
Exterior Material	Composition/Composite
Construction Type	Frame
Roof Material	Asphalt
Lot Area	4,979 sqft (0.114 acres)
Garage Type	Attached
Garage Area	460 sqft
Parking Spaces	2 Parking Spaces
Porch	Porch
Porch Area	136 sqft
Patio Area	336 sqft

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Forced Air with A/C

Location & Zoning

Account Number	R0607895
Street Address	4423 MAXWELL AVE
City	LONGMONT
State	CO
Zip	80503-4191
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 17 BLK 4 TRAMONTO REPLAT A
Legal Range	69
Legal Township	2N
Legal Section	18
Legal Subdivision	TRAMONTO REP A
Legal Block	4
Legal Lot Number	17
Jurisdiction	BOULDER CO
Township / Civil Division	LONGMONT
Census Block Group	1
Census Block	1005
Census Tract	13214

Owner

4423 Maxwell Ave is owned and occupied by two individuals who bought it in March 2019.

Source: Boulder County records, as of September 18, 2026

Owner of Record	2 Individual Names on File
Mailing Address	4423 MAXWELL AVE, LONGMONT, CO 80503-4191
Occupancy	Owner Occupied
Owner Type	Individual

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Deeds, Mortgages & Sale History

Date	Document
Mar 12, 2019	Grant Deed, Subdivision Related Transfer LAND TITLE GUARANTEE
Mar 12, 2019	Grant Deed, Transfer LAND TITLE GUARANTEE
Jun 11, 2018	Loan Modification, Mortgage · Line of Credit VECTRA BK/CO

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Mar 12, 2019 · Amount on File
Deed Sale	Mar 12, 2019 · Amount on File
Deed Document Number	20193701697
Record Updated	Oct 29, 2026

March 2019: Grant Deed, Subdivision Related Transfer

Document Type	Grant Deed
Jurisdiction	BOULDER CO
Recording Date	Mar 12, 2019
Property Address	4423 MAXWELL AVE, LONGMONT, CO 80503-4191
Document Number	0003701698
Instrument Date	Mar 11, 2019
Instrument	3701698
Transaction Type	Subdivision Related Transfer
Record Updated	Mar 21, 2019
Title Company	LAND TITLE GUARANTEE

Transaction

Tax	$0.00
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	4423 MAXWELL AVE LONGMONT CO 805034191, LONGMONT, CO 80503-4191

March 2019: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	BOULDER CO
Recording Date	Mar 12, 2019
Property Address	4423 MAXWELL AVE, LONGMONT, CO 80503-4191
Document Number	0003701697
Instrument Date	Mar 11, 2019
Instrument	3701697
Transaction Type	Transfer
Record Updated	Mar 22, 2019
Title Company	LAND TITLE GUARANTEE

Transaction

Amount	Amount on Record
Tax	$68.99
Amount Accuracy	Confirmed
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants with Right of Survivorship
Address	4423 MAXWELL AVE LONGMONT CO 805034191, LONGMONT, CO 80503-4191

June 2018: Loan Modification, Mortgage

Document Type	Loan Modification
Jurisdiction	BOULDER CO
Recording Date	Jun 11, 2018
Property Address	4423 MAXWELL AVE, LONGMONT, CO 80503-4191
Instrument Date	May 15, 2018
Instrument	3659798
Transaction Type	Mortgage
Record Updated	Jun 22, 2018

Transaction

Tax	$0.00
Additional	Multiple Parcels

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Company
Address	4557 MAXWELL AVE LONGMONT CO 805034192, LONGMONT, CO 80503-4192

Mortgage

Document Number	0003659798
Date	Jun 11, 2018
Instrument	3659798

Lender

Name	VECTRA BK/CO
Type	Bank
Address	2000 S COLORADO BLVD # 2-1200, DENVER, CO 80222-7933

Agreement

Type	Line of Credit
Amount	Amount on Record

Interest

Rate Type	Adjustable Rate

Tax Assessment & Valuation

The 2025 property tax bill for 4423 Maxwell Ave was $5,890.

Source: Boulder County assessment roll, as of September 18, 2026

Property Jurisdictions

Type	Name
State	Colorado
County	Boulder County
Municipality	Longmont City
Unified School District	St. Vrain Valley School District RE 1J (PK - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$56,290 (+0.32%) Land $4,358 Building $51,932	$897,800 (-) Land $134,100 Building $763,700
2025	$5,890.00	$56,112 Land $8,381 Building $47,731	$897,800 Land $134,100 Building $763,700
2023	$4,919.00 (+9%)	$55,824 (+22.39%) Land $8,911 Building $46,913	$833,200 (+26.95%) Land $133,000 Building $700,200
2022	$4,513.00	$45,613 Land $6,811 Building $38,802	$656,300 Land $98,000 Building $558,300

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.

Flood

FEMA maps place 4423 Maxwell Ave in Zone X, an area of minimal flood risk.

Source: FEMA National Flood Hazard Layer, effective October 14, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it
Community Rating System	Class 5 (25% premium discount)
Nearby Flood Policies	5 in force

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.

Wildfire

Wildfire risk around 4423 Maxwell Ave is moderate, ranking above 46% of the US, with a 0.09% annual chance of wildfire.

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire Risk	Moderate above 46% of the US · lower than 70% of Colorado
Wildfire Likelihood	0.09% annual chance
Exposure	None beyond ember reach

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water System	CITY OF LONGMONT serves 104,178 people · EPA ID CO0107485
Water Source	Surface water
Last State Inspection	Sep 2025
Lead	2 ppb (2023–2025) action level 15 ppb

Violations Reported to EPA

Water Quality	None last 10 years
Treatment and Procedure	None last 10 years
Monitoring and Reporting	None last 3 years

Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.

Internet Providers

Source: FCC Broadband Data Collection, based on 298 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
NextLight Fiber	10,000 / 10,000
Xfinity Cable	1,200 / 35
CenturyLink DSL · Fiber in parts of the area	140 / 20

May also be available: Verizon.

Cell Coverage

5G (outdoors only) and 4G LTE

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