Boulder County property record for 640 S 43rd St, Boulder, CO 80305
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2.25 ba · 2,176 sqft · built 1959 |
| Lot Size | 0.168 acres (7,312 sqft) |
| Owner | Individual Name on Record |
| Last Sale | $157,000 (Mar 1994) |
| Tax Bill | $4,207 (2025) |
| Deeds & Mortgages | Jun 2017 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 1577-08-1-04-010 |
| Primary APN | 1577-08-1-04-010 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.25 Baths |
| Half Baths | 2 Half Baths |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 2,176 sqft Living Area |
| 1st Floor Area | 1,136 sqft |
| Basement Area | 1,040 sqft |
| Finished Basement | 1,040 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1959 |
|---|---|
| Effective Year Built | Effective 1964 |
| Architectural Style | Ranch |
| Exterior Material | Brick Veneer |
| Construction Type | Masonry / Concrete Block |
| Roof Material | Asphalt |
| Lot Area | 7,312 sqft (0.168 acres) |
| Garage Type | Carport |
| Garage Area | 220 sqft |
| Carport | Carport |
| Carport Area | 220 sqft |
| Parking Spaces | 1 Parking Space |
| Porch | Porch |
| Porch Area | 64 sqft |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0014280 |
|---|---|
| Street Address | 640 S 43RD ST |
| City | BOULDER |
| State | CO |
| Zip | 80305-6012 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 10 BLK 4 MARTIN ACRES 3 |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 05 |
| Legal Subdivision | MARTIN ACRES 3 - BO |
| Legal Block | 4 |
| Legal Lot Number | 10 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 3 |
| Census Block | 3002 |
| 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 | 640 S 43RD ST, BOULDER, CO 80305-6012 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Mar 28, 1994 · Amount on Record |
| Deed Sale | Mar 28, 1994 · Amount on Record |
| Prior Sale | Oct 9, 1990 · Amount on Record |
| Deed Document Number | 19941409457 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | BOULDER CO |
| Property Address | 640 S 43RD ST, BOULDER, CO 80305-6012 |
| Transaction Type | Mortgage |
| Record Updated | Feb 5, 2021 |
| Name | Verified Name |
|---|
| Document Number | 0003596513 |
|---|---|
| Date | Jun 7, 2017 |
| Instrument | 3596513 |
| Name | SYNERGY ONE LENDING |
|---|---|
| Type | Lending Institution |
| Address | SAN DIEGO, CA 92108 |
| Type | FHA Mortgage |
|---|---|
| Amount | Amount Recorded |
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 | $50,048 (-0.65%) Land $27,948 Building $22,100 | $806,000 (-) Land $481,000 Building $325,000 | |
| 2025 | $4,207.00 (+1.15%) | $50,376 (-12.71%) Land $30,063 Building $20,313 | $806,000 (-6.43%) Land $481,000 Building $325,000 |
| 2024 | $4,159.00 (+1.76%) | ||
| 2023 | $4,087.00 (+15.55%) | $57,713 (+29.22%) Land $35,523 Building $22,190 | $861,400 (+34.05%) Land $530,200 Building $331,200 |
| 2022 | $3,537.00 | $44,661 Land $26,445 Building $18,216 | $642,600 Land $380,500 Building $262,100 |
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 | 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 67% of the US · lower than 84% of Colorado |
|---|---|
| Wildfire Likelihood | 0.04% annual chance |
| Exposure | Indirect 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 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.
Search by:
By searching, you agree to: Terms • Privacy • Disclosures