Boulder County property record for 4644 Macarthur Ln, Boulder, CO 80303
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1.75 ba · 1,914 sqft · built 1979 |
| Lot Size | 0.042 acres (1,846 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $129,000 (Sep 1989) |
| Tax Bill | $3,575 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1463-33-2-12-014 |
| Primary APN | 1463-33-2-12-014 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1.75 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 6 Rooms |
| Building Area | 1,914 sqft Living Area |
| Gross Area | 2,858 sqft |
| 1st Floor Area | 944 sqft |
| Upper Floors Area | 970 sqft |
| Basement Area | 944 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1979 |
|---|---|
| Effective Year Built | Effective 1979 |
| Architectural Style | Townhouse |
| Exterior Material | Wood Shingle |
| Construction Type | Frame |
| Lot Area | 1,846 sqft (0.042 acres) |
| Garage Type | Detached |
| Garage Area | 288 sqft |
| Parking Spaces | 1 Parking Space |
| Porch | Porch |
|---|---|
| Porch Area | 24 sqft |
| Deck Area | 112 sqft |
| Patio Area | 328 sqft |
| Cooling System | Central |
|---|---|
| Heating Fuel | Electric |
| Account Number | R0077979 |
|---|---|
| Street Address | 4644 MACARTHUR LN |
| City | BOULDER |
| State | CO |
| Zip | 80303-1140 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 14 MACARTHUR PARK |
| Legal Range | 70 |
| Legal Township | 1N |
| Legal Section | 33 |
| Legal Subdivision | MACARTHUR PARK - BO |
| Legal Block | 3 |
| Legal Lot Number | 14 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 3 |
| Census Block | 3003 |
| Census Tract | 12603 |
4644 Macarthur Ln is owned and occupied by two individuals who acquired it in September 2003.
Source: Boulder County records, as of September 18, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 4644 MACARTHUR LN, BOULDER, CO 80303-1140 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Sep 14, 1989 · Amount on File |
| Deed Sale | Sep 14, 1989 · Amount on File |
| Prior Sale | Aug 11, 1986 · Amount on File |
| Deed Document Number | 19891003441 |
| Last Transfer Date | Sep 8, 2003 |
| Transfer Doc | 0002501904 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 4644 Macarthur Ln was $3,575.
Source: Boulder County assessment roll, as of September 18, 2026
| Type | Name |
|---|---|
| State | Colorado |
| County | Boulder County |
| Municipality | Boulder City |
| Unified School District | Boulder Valley School District RE-2 (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $42,834 (-2.08%) Land $13,608 Building $29,226 | $699,900 (-) Land $270,100 Building $429,800 | |
| 2025 | $3,575.00 | $43,744 Land $16,881 Building $26,863 | $699,900 Land $270,100 Building $429,800 |
| 2023 | $2,994.00 (+10.28%) | $45,064 (+24.52%) Land $21,366 Building $23,698 | $672,600 (+29.17%) Land $318,900 Building $353,700 |
| 2022 | $2,715.00 | $36,189 Land $15,700 Building $20,489 | $520,700 Land $225,900 Building $294,800 |
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.
FEMA maps place 4644 Macarthur Ln in Zone X, an area of minimal flood risk, within 100 ft of a high-risk flood zone.
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 |
|---|---|
| Nearest Special Flood Hazard Area | Zone AO, within 100 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on File median of 31 policies |
| Community Rating System | Class 5 (25% premium discount) |
| Nearby Flood Policies | 31 in force |
| Nearby Flood Claims | 7 (2000–2013) |
| Claims Outside the SFHA | 5 of 7 |
| Most Recent Claim | Sep 2013 · Severe Storms, Flooding, Landslides, And Mudslides |
| Claims by Event |
|
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.
The area around 4644 Macarthur Ln has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | CITY OF BOULDER serves 166,080 people · EPA ID CO0107152 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Sep 2024 |
| Lead | 2 ppb (2023–2025) action level 15 ppb |
| 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, not water tested at this address; lead at the tap also depends on the building's own pipes.
Source: FCC Broadband Data Collection, based on 103 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Ayva Networks Fixed Wireless | 2,500 / 2,500 |
| Xfinity Cable · Fiber in parts of the area | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| LiveWireNet Fixed Wireless | 250 / 100 |
| AT&T Fixed Wireless | 100 / 20 |
May also be available: CenturyLink.
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