Boulder County property record for 305 31st St, Boulder, CO 80305
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1 ba · 988 sqft · built 1955 |
| Lot Size | 0.228 acres (9,931 sqft) |
| Owner | Individual Name on Record |
| Last Sale | $310,000 (Jun 2003) |
| Tax Bill | $4,203 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1577-05-2-10-031 |
| Primary APN | 1577-05-2-10-031 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 988 sqft Living Area |
| Gross Area | 1,248 sqft |
| 1st Floor Area | 988 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1955 |
|---|---|
| Effective Year Built | Effective 1980 |
| Architectural Style | Ranch |
| Exterior Material | Combination |
| Construction Type | Frame |
| Roof Material | Asphalt |
| Lot Area | 9,931 sqft (0.228 acres) |
| Garage Type | Attached |
| Garage Area | 260 sqft |
| Parking Spaces | 1 Parking Space |
| Patio Area | 299 sqft |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0008560 |
|---|---|
| Street Address | 305 31ST ST |
| City | BOULDER |
| State | CO |
| Zip | 80305-3404 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 31 BLK 10 HIGHLAND PARK 1 |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 05 |
| Legal Subdivision | HIGHLAND PARK 1 - BO |
| Legal Block | 10 |
| Legal Lot Number | 31 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 2 |
| Census Block | 2005 |
| 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 | Individual Name on Record |
|---|---|
| Mailing Address | 305 31ST ST, BOULDER, CO 80305-3404 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Jun 26, 2003 · Amount on Record |
| Deed Sale | Jun 26, 2003 · Amount on Record |
| Prior Sale | Apr 30, 1998 · Amount on Record |
| Deed Document Number | 20032462321 |
| Record Updated | Oct 29, 2026 |
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 | $50,000 (-0.66%) Land $32,177 Building $17,823 | $805,300 (-) Land $543,200 Building $262,100 | |
| 2025 | $4,203.00 (-10.46%) | $50,331 (-13.3%) Land $33,950 Building $16,381 | $805,300 (-7.05%) Land $543,200 Building $262,100 |
| 2023 | $4,694.00 (+11.82%) | $58,049 (+28.4%) Land $39,932 Building $18,117 | $866,400 (+33.19%) Land $596,000 Building $270,400 |
| 2022 | $4,198.00 | $45,209 Land $30,246 Building $14,963 | $650,500 Land $435,200 Building $215,300 |
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 | 9 in force |
| Nearby Flood Claims | 1 (2013) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Sep 2013 · Severe Storms, Flooding, Landslides, And Mudslides |
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 | 0.02% 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 294 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 | 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 |
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