Boulder County property record for 340 S 43rd St, Boulder, CO 80305
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2.25 ba · 1,736 sqft · built 1957 |
| Lot Size | 0.159 acres (6,930 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $344,000 (Aug 2011) |
| Tax Bill | $4,923 (2025) |
| Deeds & Mortgages | Aug 2017 Mortgage Apr 2020 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 1577-05-4-26-002 |
| Primary APN | 1577-05-4-26-002 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.25 Baths |
| Half Baths | 2 Half Baths |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,736 sqft Living Area |
| 1st Floor Area | 1,736 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1957 |
|---|---|
| Effective Year Built | Effective 1957 |
| Architectural Style | Ranch |
| Exterior Material | Brick Veneer |
| Construction Type | Masonry / Concrete Block |
| Roof Material | Asphalt |
| Lot Area | 6,930 sqft (0.159 acres) |
| Garage Type | Detached |
| Garage Area | 360 sqft |
| Parking Spaces | 1 Parking Space |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0012742 |
|---|---|
| Street Address | 340 S 43RD ST |
| City | BOULDER |
| State | CO |
| Zip | 80305-6006 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 2 BLK 9 MARTIN ACRES 2 |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 05 |
| Legal Subdivision | MARTIN ACRES 2 - BO |
| Legal Block | 9 |
| Legal Lot Number | 2 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 3 |
| Census Block | 3010 |
| Census Tract | 12507 |
Source: Boulder County records, as of September 18, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | 2 Individual Names on Record |
|---|---|
| Mailing Address | 340 S 43RD ST, BOULDER, CO 80305-6006 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Date | Document |
|---|---|
| Aug 15, 2017 | Deed of Trust, Mortgage · Conventional Mortgage NATIONAL BANK OF KANSAS CITY |
| Apr 20, 2020 | Deed of Trust, Mortgage · Conventional Mortgage NATIONAL BANK OF KANSAS CITY |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Aug 30, 2011 · Amount on Record |
| Deed Sale | Aug 30, 2011 · Amount on Record |
| Prior Sale | May 17, 1999 · Amount on Record |
| Deed Document Number | 20113167989 |
| Last Transfer Date | Jun 16, 2014 |
| Transfer Doc | 0003386979 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | BOULDER CO |
| Property Address | 340 S 43RD ST, BOULDER, CO 80305-6006 |
| Transaction Type | Mortgage |
| Record Updated | Feb 5, 2021 |
| Name | Verified Name |
|---|
| Document Number | 0003609018 |
|---|---|
| Date | Aug 15, 2017 |
| Instrument | 3609018 |
| Name | NATIONAL BANK OF KANSAS CITY |
|---|---|
| Type | Bank |
| Address | KANSAS CITY, MO 64114 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Sep 1, 2047 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | BOULDER CO |
| Property Address | 340 S 43RD ST, BOULDER, CO 80305-6006 |
| Transaction Type | Mortgage |
| Record Updated | Feb 5, 2021 |
| Name | Verified Name |
|---|
| Document Number | 0003778398 |
|---|---|
| Date | Apr 20, 2020 |
| Instrument | 3778398 |
| Name | NATIONAL BANK OF KANSAS CITY |
|---|---|
| Type | Bank |
| Address | KANSAS CITY, MO 64114 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 360 Months |
| Due | Apr 1, 2050 |
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 | $51,415 (-0.42%) Land $32,586 Building $18,829 | $826,100 (-) Land $549,200 Building $276,900 | |
| 2025 | $4,923.00 (+2.03%) | $51,631 (-12.03%) Land $34,325 Building $17,306 | $826,100 (-5.7%) Land $549,200 Building $276,900 |
| 2023 | $4,825.00 (+12.21%) | $58,692 (+28.99%) Land $40,227 Building $18,465 | $876,000 (+33.8%) Land $600,400 Building $275,600 |
| 2022 | $4,300.00 | $45,501 Land $29,836 Building $15,665 | $654,700 Land $429,300 Building $225,400 |
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.
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 | 0.03% 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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