Boulder County property record for 423 Concord Ave, Boulder, CO 80304
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2 ba · 2,602 sqft · built 1900 |
| Lot Size | 0.156 acres (6,800 sqft) |
| Owner | Individual Name on Record |
| Tax Bill | $11,261 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1461-25-1-02-005 |
| Primary APN | 1461-25-1-02-005 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 11 Rooms |
| Stories | 2 Stories |
| Building Area | 2,602 sqft Living Area |
| 1st Floor Area | 1,222 sqft |
| Upper Floors Area | 704 sqft |
| Basement Area | 676 sqft |
| Finished Basement | 676 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1900 |
|---|---|
| Effective Year Built | Effective 1980 |
| Architectural Style | A-Frame |
| Exterior Material | Wood Shingle |
| Construction Type | Frame |
| Roof Material | Asphalt |
| Lot Area | 6,800 sqft (0.156 acres) |
| Garage Type | Detached |
| Garage Area | 240 sqft |
| Parking Spaces | 1 Parking Space |
| Porch | Porch |
| Porch Area | 126 sqft |
| Deck Area | 222 sqft |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0007088 |
|---|---|
| Street Address | 423 CONCORD AVE |
| City | BOULDER |
| State | CO |
| Zip | 80304-3918 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOTS 9-10 BLK 11 MAXWELL ADDITION - AMENDED PLAT OF BLOCKS 10 11 12 & 13 |
| Legal Range | 71 |
| Legal Township | 1N |
| Legal Section | 25 |
| Legal Subdivision | MAXWELLS - BO |
| Legal Block | 11,10 |
| Legal Lot Number | 9 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 1 |
| Census Block | 1022 |
| Census Tract | 12101 |
Source: Boulder County records, 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 | Individual Name on Record |
|---|---|
| Mailing Address | 2300 EMERALD RD, BOULDER, CO 80304-0914 |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Oct 6, 1992 |
| Deed Sale | Oct 6, 1992 |
| Deed Document Number | 19921227024 |
| Last Transfer Date | Aug 22, 2001 |
| Transfer Doc | 0002191148 |
| 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 | $128,499 (+8.8%) Land $110,112 Building $18,387 | $1,889,700 (-) Land $1,619,300 Building $270,400 | |
| 2025 | $11,261.00 (-0.21%) | $118,106 (-10.95%) Land $101,206 Building $16,900 | $1,889,700 (-4.54%) Land $1,619,300 Building $270,400 |
| 2023 | $11,285.00 (+20.48%) | $132,633 (+33.62%) Land $110,188 Building $22,445 | $1,979,600 (+38.61%) Land $1,644,600 Building $335,000 |
| 2022 | $9,367.00 | $99,260 Land $71,175 Building $28,085 | $1,428,200 Land $1,024,100 Building $404,100 |
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 |
| Flood Insurance Cost | Premium on Record median of 12 individual policies |
| Community Rating System | Class 5 (25% premium discount) |
| Nearby Flood Policies | 16 units insured incl. 4 condo units |
| Nearby Flood Claims | 3 (2013) |
| Claims Outside the SFHA | 3 of 3 |
| Most Recent Claim | Sep 2013 · Severe Storms, Flooding, Landslides, And Mudslides |
| 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 | High above 77% of the US · above 78% of Colorado |
|---|---|
| Wildfire Likelihood | 0.4% annual chance |
| Exposure | Indirect within ember reach |
| Adjoins Burnable Land | Yes |
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 684 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 |
| LiveWireNet Fixed Wireless | 250 / 100 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless | 100 / 20 |
May also be available: Verizon.
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