Boulder County property record for 521 Hill St, Boulder, CO 80302
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 1 ba · 2,069 sqft · built 1919 |
| Lot Size | 0.896 acres (39,035 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $260,650 (Apr 2012) |
| Tax Bill | $3,790 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1459-12-0-08-007 |
| Primary APN | 1459-12-0-08-007 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 8 Rooms |
| Stories | 1 Story |
| Building Area | 2,069 sqft Living Area |
| 1st Floor Area | 1,606 sqft |
| Upper Floors Area | 463 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1919 |
|---|---|
| Effective Year Built | Effective 1998 |
| Exterior Material | Logs |
| Construction Type | Frame |
| Lot Area | 39,035 sqft (0.896 acres) |
| Shed | 1 Shed |
| Total Buildings | 2 Buildings |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0023776 |
|---|---|
| Street Address | 521 HILL ST |
| City | BOULDER |
| State | CO |
| Zip | 80302-8709 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | H |
| Legal Description | LOTS 1-4 & 11-14 BLK 10 GOLD HILL IDS 23777-8 COMBINED HERE ID 24779 COMB HERE/APPEAL 5/96 & LESS 345 SQ FT M/L LOT 11 PER BDY LINE AGREEMENT REC # 2823721 |
| Legal Range | 72 |
| Legal Township | 1N |
| Legal Section | 12 |
| Legal Subdivision | GOLD HILL - MT |
| Legal Block | 10 |
| Legal Lot Number | 3 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BALD MOUNTAIN |
| Census Block Group | 2 |
| Census Block | 2025 |
| Census Tract | 13703 |
Source: NPS National Register of Historic Places, as of August 1, 2026
| Historic District | Within the Gold Hill Historic District listed 1989 · 38 contributing resources · NRIS 89000979 |
|---|
Federal listing alone does not restrict alterations; local historic district rules, which this data does not cover, may apply.
521 Hill St is owned and occupied by two individuals who bought it in April 2012.
Source: Boulder County records, as of September 18, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 521 HILL ST, BOULDER, CO 80302-8709 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Apr 13, 2012 · Amount on File |
| Deed Sale | Apr 13, 2012 · Amount on File |
| Prior Sale | Mar 7, 1997 · Amount on File |
| Deed Document Number | 20123216543 |
| Prior Transfer Date | Apr 11, 2012 |
| Prior Transfer Doc | 0003216188 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 521 Hill St was $3,790.
Source: Boulder County assessment roll, as of September 18, 2026
| Type | Name |
|---|---|
| State | Colorado |
| County | Boulder County |
| Unified School District | Boulder Valley School District RE-2 (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $39,156 (-2.08%) Building $39,156 | $639,800 (-) Land $52,600 Building $587,200 | |
| 2025 | $3,790.00 | $39,988 Land $3,288 Building $36,700 | $639,800 Land $52,600 Building $587,200 |
| 2023 | $3,570.00 (+8.51%) | $45,299 (+27.07%) Land $3,893 Building $41,406 | $676,100 (+31.82%) Land $58,100 Building $618,000 |
| 2022 | $3,290.00 | $35,648 Land $2,641 Building $33,007 | $512,910 Land $38,000 Building $474,910 |
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.
FEMA maps place 521 Hill St in Zone X, an area of minimal flood risk, though there have been 3 flood claims nearby since 2013.
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 | 7 in force |
| 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 521 Hill St is extreme, ranking above 95% of the US, with a 1% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Extreme above 95% of the US · above 98.2% of Colorado |
|---|---|
| Wildfire Likelihood | 1% annual chance |
| Exposure | Direct burnable vegetation |
Insurers in high-risk areas may require mitigation or decline coverage; check availability before making an offer.
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: FCC Broadband Data Collection, based on 34 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Ayva Networks Fixed Wireless | 2,500 / 2,500 |
| Visionary Broadband Fixed Wireless | 200 / 20 |
| CenturyLink DSL | 100 / 10 |
May also be available: Xfinity.
4G LTE (outdoors only), no 5G reported
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