Boulder County property record for 2321 4th St, Boulder, CO 80302
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 2 ba · 2,280 sqft · built 1911 |
| Lot Size | 0.145 acres (6,300 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $70,000 (Jun 1980) |
| Tax Bill | $12,443 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1461-25-3-04-009 |
| Primary APN | 1461-25-3-04-009 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 7 Rooms |
| Stories | 2 Stories |
| Building Area | 2,280 sqft Living Area |
| Gross Area | 2,544 sqft |
| 1st Floor Area | 1,547 sqft |
| Upper Floors Area | 733 sqft |
| Basement Area | 264 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1911 |
|---|---|
| Effective Year Built | Effective 1988 |
| Architectural Style | A-Frame |
| Exterior Material | Wood Shingle |
| Construction Type | Frame |
| Roof Material | Asphalt |
| Lot Area | 6,300 sqft (0.145 acres) |
| Porch | Porch |
| Porch Area | 140 sqft |
| Deck Area | 69 sqft |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0004038 |
|---|---|
| Street Address | 2321 4TH ST |
| City | BOULDER |
| State | CO |
| Zip | 80302-4711 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOTS 16-17 BLK 1 MAPLETON PARK |
| Legal Range | 71 |
| Legal Township | 1N |
| Legal Section | 25 |
| Legal Subdivision | MAPLETON PARK - BO |
| Legal Block | 1 |
| Legal Lot Number | 16 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 1 |
| Census Block | 1015 |
| Census Tract | 12101 |
2321 4th St is owned and occupied by two individuals who bought it in June 1980.
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 File |
|---|---|
| Mailing Address | 2321 4TH ST, BOULDER, CO 80302-4711 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Jun 20, 1980 · Amount on File |
| Deed Sale | Jun 20, 1980 · Amount on File |
| Prior Sale | Jun 20, 1980 |
| Deed Document Number | 1980400091 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 2321 4th St was $12,443.
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 | $144,031 (+5.32%) Land $101,395 Building $42,636 | $2,188,100 (-) Land $1,561,100 Building $627,000 | |
| 2025 | $12,443.00 | $136,757 Land $97,569 Building $39,188 | $2,188,100 Land $1,561,100 Building $627,000 |
| 2023 | $11,791.00 (+10.13%) | $146,931 (+20.2%) Land $100,011 Building $46,920 | $2,193,000 (+24.69%) Land $1,492,700 Building $700,300 |
| 2022 | $10,706.00 | $122,237 Land $75,477 Building $46,760 | $1,758,800 Land $1,086,000 Building $672,800 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 2321 4th St in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
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 |
|---|---|
| Nearest Special Flood Hazard Area | Zone A, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on File 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.
Wildfire risk around 2321 4th St is high, ranking above 82% of the US, with a 0.8% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | High above 82% of the US · above 85% of Colorado |
|---|---|
| Wildfire Likelihood | 0.8% annual chance |
| Exposure | Direct burnable vegetation |
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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