Boulder County property record for 355 S 43rd St, Boulder, CO 80305
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 2 ba · 2,304 sqft · built 1957 |
| Lot Size | 0.175 acres (7,620 sqft) |
| Owner | Individual Name on File |
| Last Sale | $1,120,000 (Jun 2023) |
| Tax Bill | $6,021 (2025) |
| Deeds & Mortgages | Jun 2023 Sale |
| Flood Zone | Zone X (minimal risk) |
| APN | 1577-05-4-25-025 |
| Primary APN | 1577-05-4-25-025 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 2 Baths |
| Half Baths | 2 Half Baths |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 2,304 sqft Living Area |
| Gross Area | 2,744 sqft |
| 1st Floor Area | 1,152 sqft |
| Basement Area | 1,372 sqft |
| Finished Basement | 1,152 sqft |
| Unfinished Basement | 220 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1957 |
|---|---|
| Effective Year Built | Effective 1995 |
| Architectural Style | Ranch |
| Exterior Material | Brick Veneer |
| Construction Type | Masonry / Concrete Block |
| Roof Material | Asphalt |
| Lot Area | 7,620 sqft (0.175 acres) |
| Garage Type | Attached |
| Garage Area | 220 sqft |
| Parking Spaces | 1 Parking Space |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0010528 |
|---|---|
| Street Address | 355 S 43RD ST |
| City | BOULDER |
| State | CO |
| Zip | 80305-6005 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 25 BLK 8 MARTIN ACRES 2 |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 05 |
| Legal Subdivision | MARTIN ACRES 2 - BO |
| Legal Block | 8 |
| Legal Lot Number | 25 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 3 |
| Census Block | 3009 |
| Census Tract | 12507 |
355 S 43rd St is owned by an individual who bought it in June 2023.
Source: Boulder County records, as of September 18, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | PO BOX 676, NEDERLAND, CO 80466-0676 |
| Owner Type | Individual |
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 | Jun 1, 2023 · Amount on File |
| Deed Sale | Jun 1, 2023 · Amount on File |
| Prior Sale | Dec 8, 2000 · Amount on File |
| Deed Document Number | 20234009400 |
| Prior Transfer Date | Jan 23, 2001 |
| Prior Transfer Doc | 0002117336 |
| Record Updated | Oct 29, 2026 |
| Document Type | Special Warranty Deed |
|---|---|
| Jurisdiction | BOULDER CO |
| Recording Date | Jun 1, 2023 |
| Property Address | 355 S 43RD ST, BOULDER, CO 80305-6005 |
| Document Number | 0004009400 |
| Instrument Date | May 31, 2023 |
| Instrument | 4009400 |
| Transaction Type | Transfer |
| Record Updated | Jun 21, 2023 |
| Title Company | LAND TITLE |
| Amount | Amount on Record |
|---|---|
| Tax | $112.00 |
| Amount Accuracy | Full Amount Stated |
| Additional |
|
| Name | Verified Name |
|---|---|
| Address | 355 S 43RD ST, BOULDER, CO 80305-6005 |
| Name | Verified Name |
|---|---|
| Address | 375 S 44TH ST, BOULDER, CO 80305-6015 |
The 2025 property tax bill for 355 S 43rd St was $6,021.
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 | $63,947 (+1.26%) Land $34,401 Building $29,546 | $1,010,400 (-) Land $575,900 Building $434,500 | |
| 2025 | $6,021.00 | $63,150 Land $35,994 Building $27,156 | $1,010,400 Land $575,900 Building $434,500 |
| 2023 | $5,216.00 (+12.46%) | $64,085 (+28.3%) Land $42,183 Building $21,902 | $956,500 (+33.09%) Land $629,600 Building $326,900 |
| 2022 | $4,638.00 | $49,950 Land $31,289 Building $18,661 | $718,700 Land $450,200 Building $268,500 |
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 355 S 43rd St in Zone X, an area of minimal flood risk, though there have been 7 flood claims nearby since 1979.
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.
Wildfire risk around 355 S 43rd St is low, with a 0.03% annual chance of wildfire.
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 | 0.03% 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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