Boulder County property record for 840 Union Ave, Boulder, CO 80304
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 3.5 ba · 3,453 sqft · built 1962 |
| Lot Size | 0.165 acres (7,193 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $1,075,000 (Jun 2015) |
| Tax Bill | $11,659 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1461-13-1-46-001 |
| Primary APN | 1461-13-1-46-001 |
|---|---|
| Alternative APN |
|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 3.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 9 Rooms |
| Stories | 2 Stories |
| Building Area | 3,453 sqft Living Area |
| 1st Floor Area | 1,692 sqft |
| Upper Floors Area | 1,761 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1962 |
|---|---|
| Effective Year Built | Effective 2001 |
| Architectural Style | A-Frame |
| Exterior Material | Wood Shingle |
| Construction Type | Frame |
| Roof Material | Asphalt |
| Lot Area | 7,193 sqft (0.165 acres) |
| Garage Type | Carport |
| Garage Area | 495 sqft |
| Carport | Carport |
| Carport Area | 495 sqft |
| Parking Spaces | 2 Parking Spaces |
| Porch | Porch |
| Porch Area | 120 sqft |
| Deck Area | 190 sqft |
| Cooling System | Central |
|---|---|
| Heating System | Forced Air with A/C |
| Account Number | R0601934 |
|---|---|
| Street Address | 840 UNION AVE |
| City | BOULDER |
| State | CO |
| Zip | 80304-0709 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 3A GWEN REPLAT A |
| Legal Range | 71 |
| Legal Township | 1N |
| Legal Section | 13 |
| Legal Subdivision | GWEN REPLAT A |
| Legal Block | 1 |
| Legal Lot Number | 3A |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 1 |
| Census Block | 1007 |
| Census Tract | 12104 |
Source: Boulder County records · APN 1461-13-1-46-001
Assessment roll updated June 15, 2026 · Last verified June 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 | PO BOX 20217, BOULDER, CO 80308-3217 |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Jun 01, 2015 · Amount on Record |
| Deed Sale | Jun 01, 2015 · Amount on Record |
| Prior Sale | Feb 20, 2014 · Amount on Record |
| Deed Document Number | 20153449043 |
| Record Updated | Sep 20, 2026 |
Source: Boulder County records · Assessment roll updated June 15, 2026 · Last verified June 2026
| Type | Name |
|---|---|
| State | Colorado |
| County | Boulder County |
| Municipality | Boulder City |
| Unified School District | Boulder Valley School District RE-2 (PK - 12) |
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.
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $133,042 (+8.8%) Land $68,728 Building $64,314 | $1,956,500 (-) Land $1,010,700 Building $945,800 | |
| 2025 | $11,659.00 (+0.26%) | $122,282 (-11.61%) Land $63,169 Building $59,113 | $1,956,500 (-5.25%) Land $1,010,700 Building $945,800 |
| 2023 | $11,629.00 (+19.54%) | $138,348 (+32.06%) Land $68,936 Building $69,412 | $2,064,900 (+36.98%) Land $1,028,900 Building $1,036,000 |
| 2022 | $9,728.00 | $104,765 Land $55,232 Building $49,533 | $1,507,400 Land $794,700 Building $712,700 |
Source: FEMA National Flood Hazard Layer, Boulder County (08013C), as of October 14, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 080130121041, as of September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition, as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Nearest Special Flood Hazard Area | Zone A, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on Record median of 58 individual policies |
| Community Rating System | Class 5 (25% premium discount) |
| Nearby Flood Policies | 63 units insured incl. 5 condo units |
| Nearby Flood Claims | 14 (2013–2015) |
| Claims Outside the SFHA | 6 of 14 |
| Most Recent Claim | May 2015 · Severe Storms, Tornadoes, Flooding, Landslides, And Mudslides |
| Claims by Event |
|
| Wildfire Risk | Moderate above 64% of the US · above 54% of Colorado |
|---|---|
| Wildfire Likelihood | 0.2% annual chance |
| Exposure | Indirect within ember reach |
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: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026
| Provider | Max Down / Up (Mbps) |
|---|---|
| Ayva Fixed Wireless | 2,500 / 2,500 |
| Xfinity Cable | 2,000 / 250 |
| Live Wire Networks Fixed Wireless | 250 / 100 |
| T-Mobile USA Fixed Wireless | 100 / 20 |
May also be available: AT&T, Lumen Technologies.
Based on FCC filings for 460 locations within half a mile of this property.
5G (outdoors only) and 4G LTE
Source: EPA Safe Drinking Water Information System, water system CO0107152, as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | CITY OF BOULDER serves 166,080 people |
|---|---|
| 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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.
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