Boulder County property record for 4100 Aurora Ave, Boulder, CO 80303
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 1.75 ba · 1,944 sqft · built 1965 |
| Lot Size | 0.227 acres (9,894 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $50,000 (Apr 1977) |
| Tax Bill | $4,669 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1463-33-3-14-017 |
| Primary APN | 1463-33-3-14-017 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 1.75 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 7 Rooms |
| Building Area | 1,944 sqft Living Area |
| Gross Area | 2,208 sqft |
| 1st Floor Area | 1,240 sqft |
| Basement Area | 704 sqft |
| Finished Basement | 704 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1965 |
|---|---|
| Effective Year Built | Effective 1971 |
| Architectural Style | Split Level |
| Exterior Material | Brick Veneer |
| Construction Type | Masonry / Concrete Block |
| Lot Area | 9,894 sqft (0.227 acres) |
| Garage Type | Attached |
| Garage Area | 264 sqft |
| Parking Spaces | 1 Parking Space |
| Patio Area | 188 sqft |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0010754 |
|---|---|
| Street Address | 4100 AURORA AVE |
| City | BOULDER |
| State | CO |
| Zip | 80303-2540 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 17 BLK 3 PARK EAST |
| Legal Range | 70 |
| Legal Township | 1N |
| Legal Section | 33 |
| Legal Subdivision | PARK EAST - BO |
| Legal Block | 3 |
| Legal Lot Number | 17 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 1 |
| Census Block | 1009 |
| Census Tract | 12608 |
4100 Aurora Ave is owned and occupied by two individuals who acquired it in February 1996.
Source: Boulder County records, as of September 18, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 4100 AURORA AVE, BOULDER, CO 80303-2540 |
| 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 | 2 Names on Deed |
|---|---|
| Last Sale | Apr 26, 1977 · Amount on File |
| Deed Sale | Apr 26, 1977 · Amount on File |
| Prior Sale | Mar 5, 1973 · Amount on File |
| Deed Document Number | 1977219928 |
| Last Transfer Date | Feb 9, 1996 |
| Transfer Doc | 0001584200 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 4100 Aurora Ave was $4,669.
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 | $55,325 (+0.18%) Land $36,285 Building $19,040 | $883,600 (-) Land $603,600 Building $280,000 | |
| 2025 | $4,669.00 | $55,225 Land $37,725 Building $17,500 | $883,600 Land $603,600 Building $280,000 |
| 2023 | $4,749.00 (+16.43%) | $65,379 (+28.51%) Land $44,240 Building $21,139 | $975,800 (+33.31%) Land $660,300 Building $315,500 |
| 2022 | $4,079.00 | $50,875 Land $31,762 Building $19,113 | $732,000 Land $457,000 Building $275,000 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 4100 Aurora Ave in Zone X, an area of minimal flood risk, within 500 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 AE, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on File median of 42 policies |
| Community Rating System | Class 5 (25% premium discount) |
| Nearby Flood Policies | 42 in force |
| Nearby Flood Claims | 8 (2013) |
| Claims Outside the SFHA | 6 of 8 |
| Most Recent Claim | Oct 2013 · other causes |
| 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 4100 Aurora Ave 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 584 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Ayva Networks Fixed Wireless | 2,500 / 2,500 |
| CenturyLink Fiber | 2,000 / 1,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| LiveWireNet Fixed Wireless | 250 / 100 |
May also be available: T-Mobile.
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