Boulder County property record for 320 S 40th St, Boulder, CO 80305
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2.5 ba · 2,664 sqft · built 1956 |
| Lot Size | 0.17 acres (7,397 sqft) |
| Owner | 2 Individual Names on File |
| Tax Bill | $5,451 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1577-05-4-23-007 |
| Primary APN | 1577-05-4-23-007 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 8 Rooms |
| Stories | 2 Stories |
| Building Area | 2,664 sqft Living Area |
| Gross Area | 3,028 sqft |
| 1st Floor Area | 1,152 sqft |
| Upper Floors Area | 504 sqft |
| Basement Area | 1,152 sqft |
| Finished Basement | 1,008 sqft |
| Unfinished Basement | 144 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1956 |
|---|---|
| Effective Year Built | Effective 1987 |
| Exterior Material | Brick Veneer |
| Construction Type | Masonry / Concrete Block |
| Roof Material | Asphalt |
| Lot Area | 7,397 sqft (0.17 acres) |
| Garage Type | Attached |
| Garage Area | 220 sqft |
| Parking Spaces | 1 Parking Space |
| Patio Area | 312 sqft |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0013551 |
|---|---|
| Street Address | 320 S 40TH ST |
| City | BOULDER |
| State | CO |
| Zip | 80305-5418 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 7 BLK 6 MARTIN ACRES 2 |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 05 |
| Legal Subdivision | MARTIN ACRES 2 - BO |
| Legal Block | 6 |
| Legal Lot Number | 7 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 3 |
| Census Block | 3007 |
| Census Tract | 12507 |
Source: Boulder County assessment roll, as of June 15, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 320 S 40TH ST, BOULDER, CO 80305-5418 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Transfer Date | May 27, 1999 |
| Transfer Doc | 0001944028 |
| Record Updated | Sep 20, 2026 |
Source: Boulder County assessment roll, as of June 15, 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 | $68,999 (+8.8%) Land $38,583 Building $30,416 | $1,014,700 (-) Land $567,400 Building $447,300 | |
| 2025 | $5,451.00 (+1.57%) | $63,419 (-12.57%) Land $35,463 Building $27,956 | $1,014,700 (-6.28%) Land $567,400 Building $447,300 |
| 2023 | $5,367.00 (+13.04%) | $72,541 (+24.9%) Land $41,560 Building $30,981 | $1,082,700 (+29.56%) Land $620,300 Building $462,400 |
| 2022 | $4,748.00 | $58,081 Land $30,823 Building $27,258 | $835,700 Land $443,500 Building $392,200 |
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 | 6 in force |
| Nearby Flood Claims | 7 (1979–2022) |
| Claims Outside the SFHA | 5 of 7 |
| Most Recent Claim | Jul 2022 · rainfall accumulation |
| 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.
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 |
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 Fixed Wireless | 2,500 / 2,500 |
| Lumen Technologies Fiber · DSL in parts of the area | 2,000 / 1,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| Live Wire Networks Fixed Wireless | 250 / 100 |
| T-Mobile USA Fixed Wireless | 100 / 20 |
May also be available: AT&T.
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