Boulder County property record for 4650 Macarthur Ln, Boulder, CO 80303
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2.5 ba · 2,856 sqft · built 1979 |
| Lot Size | 0.04 acres (1,745 sqft) |
| Owner | Individual Name on File |
| Last Sale | $440,000 (Apr 2013) |
| Tax Bill | $4,603 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1463-33-2-12-012 |
| Primary APN | 1463-33-2-12-012 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 6 Rooms |
| Building Area | 2,856 sqft Living Area |
| 1st Floor Area | 944 sqft |
| Upper Floors Area | 968 sqft |
| Basement Area | 944 sqft |
| Finished Basement | 944 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1979 |
|---|---|
| Effective Year Built | Effective 1990 |
| Architectural Style | Townhouse |
| Exterior Material | Wood Shingle |
| Construction Type | Frame |
| Roof Material | Other |
| Lot Area | 1,745 sqft (0.04 acres) |
| Garage Type | Detached |
| Garage Area | 288 sqft |
| Parking Spaces | 1 Parking Space |
| Deck Area | 88 sqft |
| Patio Area | 304 sqft |
| Cooling System | Central |
|---|---|
| Heating Fuel | Electric |
| Account Number | R0077977 |
|---|---|
| Street Address | 4650 MACARTHUR LN |
| City | BOULDER |
| State | CO |
| Zip | 80303-1140 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 12 MACARTHUR PARK |
| Legal Range | 70 |
| Legal Township | 1N |
| Legal Section | 33 |
| Legal Subdivision | MACARTHUR PARK - BO |
| Legal Block | 3 |
| Legal Lot Number | 12 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 3 |
| Census Block | 3003 |
| Census Tract | 12603 |
4650 Macarthur Ln is owned and occupied by an individual who bought it in April 2013.
Source: Boulder County records, as of September 18, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 4650 MACARTHUR LN, BOULDER, CO 80303-1140 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Apr 3, 2013 · Amount on File |
| Deed Sale | Apr 3, 2013 · Amount on File |
| Prior Sale | Sep 12, 1996 · Amount on File |
| Deed Document Number | 20133302254 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 4650 Macarthur Ln was $4,603.
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 | $47,770 (-1.06%) Land $13,097 Building $34,673 | $772,500 (-) Land $262,600 Building $509,900 | |
| 2025 | $4,603.00 | $48,282 Land $16,413 Building $31,869 | $772,500 Land $262,600 Building $509,900 |
| 2023 | $3,924.00 (+8.58%) | $49,131 (+26.21%) Land $20,777 Building $28,354 | $733,300 (+30.92%) Land $310,100 Building $423,200 |
| 2022 | $3,614.00 | $38,927 Land $15,262 Building $23,665 | $560,100 Land $219,600 Building $340,500 |
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 4650 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 4650 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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