Boulder County property record for 520 S 40th St, Boulder, CO 80305
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1 ba · 1,840 sqft · built 1957 |
| Lot Size | 0.165 acres (7,174 sqft) |
| Owner | Individual Name on Record |
| Tax Bill | $4,204 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1577-08-1-07-033 |
| Primary APN | 1577-08-1-07-033 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 5 Rooms |
| Stories | 2 Stories |
| Building Area | 1,840 sqft Living Area |
| Gross Area | 2,724 sqft |
| 1st Floor Area | 1,296 sqft |
| Upper Floors Area | 544 sqft |
| Basement Area | 884 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1957 |
|---|---|
| Effective Year Built | Effective 1961 |
| Exterior Material | Brick Veneer |
| Construction Type | Masonry / Concrete Block |
| Lot Area | 7,174 sqft (0.165 acres) |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0014470 |
|---|---|
| Street Address | 520 S 40TH ST |
| City | BOULDER |
| State | CO |
| Zip | 80305-5903 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 33 BLK 7 MARTIN ACRES 3 |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 05 |
| Legal Subdivision | MARTIN ACRES 3 - BO |
| Legal Block | 7 |
| Legal Lot Number | 33 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 3 |
| Census Block | 3005 |
| Census Tract | 12508 |
Source: Boulder County records, as of September 18, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Individual Name on Record |
|---|---|
| Mailing Address | 520 S 40TH ST, BOULDER, CO 80305-5903 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Aug 8, 1980 |
| Deed Sale | Aug 8, 1980 |
| Deed Document Number | 1980406899 |
| Record Updated | Oct 29, 2026 |
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 | $50,014 (-0.66%) Land $27,635 Building $22,379 | $805,500 (-) Land $476,400 Building $329,100 | |
| 2025 | $4,204.00 (+2.46%) | $50,344 (-13.05%) Land $29,775 Building $20,569 | $805,500 (-6.79%) Land $476,400 Building $329,100 |
| 2023 | $4,103.00 (+17.26%) | $57,901 (+29.73%) Land $35,188 Building $22,713 | $864,200 (+34.57%) Land $525,200 Building $339,000 |
| 2022 | $3,499.00 | $44,633 Land $26,195 Building $18,438 | $642,200 Land $376,900 Building $265,300 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 80% of the US · lower than 91% of Colorado |
|---|---|
| Wildfire Likelihood | 0.01% annual chance |
| Exposure | None beyond 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 678 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 · DSL in parts of the area | 2,000 / 1,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| LiveWireNet Fixed Wireless | 250 / 100 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: AT&T.
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