Boulder County property record for 100 31st St, Boulder, CO 80305
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 1.75 ba · 2,394 sqft · built 1955 |
| Lot Size | 0.178 acres (7,730 sqft) |
| Owner | Company Name on Record |
| Last Sale | $335,000 (Sep 2008) |
| Tax Bill | $6,591 (2025) |
| Deeds & Mortgages | Jan 2020 Sale |
| Flood Zone | Zone X (minimal risk) |
| APN | 1577-05-3-16-010 |
| Primary APN | 1577-05-3-16-010 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 1.75 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 9 Rooms |
| Stories | 1 Story |
| Building Area | 2,394 sqft Living Area |
| Gross Area | 2,664 sqft |
| 1st Floor Area | 2,394 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1955 |
|---|---|
| Effective Year Built | Effective 1990 |
| Architectural Style | Ranch |
| Exterior Material | Brick Veneer |
| Construction Type | Masonry / Concrete Block |
| Roof Material | Asphalt |
| Lot Area | 7,730 sqft (0.178 acres) |
| Garage Type | Attached |
| Garage Area | 270 sqft |
| Parking Spaces | 1 Parking Space |
| Patio Area | 288 sqft |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0003158 |
|---|---|
| Street Address | 100 31ST ST |
| City | BOULDER |
| State | CO |
| Zip | 80305 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 12 BLK 13 HIGHLAND PARK 3 |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 05 |
| Legal Subdivision | HIGHLAND PARK 3 - BO |
| Legal Block | 13 |
| Legal Lot Number | 12 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 2 |
| Census Block | 2009 |
| Census Tract | 12507 |
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 | Company Name on Record |
|---|---|
| Mailing Address | PO BOX 1017, BOULDER, CO 80306-1017 |
| Owner Type | Company |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Sep 9, 2008 · Amount on Record |
| Deed Sale | Sep 9, 2008 · Amount on Record |
| Prior Sale | Jul 10, 2008 · Amount on Record |
| Deed Document Number | 20082953989 |
| Prior Transfer Date | Jul 8, 2008 |
| Prior Transfer Doc | 0002953989 |
| Record Updated | Oct 29, 2026 |
| Document Type | Warranty Deed |
|---|---|
| Jurisdiction | BOULDER CO |
| Recording Date | Jan 2, 2020 |
| Property Address | 100 31ST ST, BOULDER, CO 80305 |
| Document Number | 0003758064 |
| Instrument Date | Dec 1, 2019 |
| Instrument | 3758064 |
| Transaction Type | Transfer |
| Record Updated | Sep 22, 2021 |
| Title Company | HERITAGE TITLE CO |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | No Consideration Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | PO BOX 1017, BOULDER, CO 80306-1017 |
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 | $69,537 (+1.83%) Land $27,826 Building $41,711 | $1,092,600 (-) Land $479,200 Building $613,400 | |
| 2025 | $6,591.00 (-0.83%) | $68,288 (-12.91%) Land $29,950 Building $38,338 | $1,092,600 (-6.64%) Land $479,200 Building $613,400 |
| 2024 | $6,646.00 (+1.81%) | ||
| 2023 | $6,528.00 (+14.89%) | $78,411 (+29.84%) Land $35,229 Building $43,182 | $1,170,300 (+34.69%) Land $525,800 Building $644,500 |
| 2022 | $5,682.00 | $60,389 Land $26,681 Building $33,708 | $868,900 Land $383,900 Building $485,000 |
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 | Moderate above 59% of the US · above 44% of Colorado |
|---|---|
| Wildfire Likelihood | 0.2% 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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