Boulder County property record for 390 21st St, Boulder, CO 80302
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.75 ba · 2,575 sqft · built 1955 |
| Lot Size | 0.21 acres (9,125 sqft) |
| Owner | Individual Name on Record |
| Last Sale | $487,000 (Aug 2002) |
| Tax Bill | $8,887 (2025) |
| Flood Zone | Zone X (moderate risk) |
| APN | 1577-06-1-09-001 |
| Primary APN | 1577-06-1-09-001 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.75 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 8 Rooms |
| Stories | 1 Story |
| Building Area | 2,575 sqft Living Area |
| Gross Area | 2,926 sqft |
| 1st Floor Area | 2,575 sqft |
| Basement Area | 351 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1955 |
|---|---|
| Effective Year Built | Effective 1965 |
| Architectural Style | Ranch |
| Exterior Material | Brick Veneer |
| Construction Type | Masonry / Concrete Block |
| Roof Material | Asphalt |
| Lot Area | 9,125 sqft (0.21 acres) |
| Porch | Porch |
| Porch Area | 441 sqft |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0008744 |
|---|---|
| Street Address | 390 21ST ST |
| City | BOULDER |
| State | CO |
| Zip | 80302-8013 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 1 & W 16 2/3 FT OF LOT 2 BLK 17 INTERURBAN PARK |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 06 |
| Legal Subdivision | INTERURBAN PARK - BO |
| Legal Block | 17 |
| Legal Lot Number | 1 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 1 |
| Census Block | 1026 |
| Census Tract | 12505 |
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 | 390 21ST ST, BOULDER, CO 80302-8013 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Aug 19, 2002 · Amount on Record |
| Deed Sale | Aug 19, 2002 · Amount on Record |
| Deed Document Number | 20022320838 |
| 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 | $108,216 (+8.8%) Land $72,434 Building $35,782 | $1,591,400 (-) Land $1,065,200 Building $526,200 | |
| 2025 | $8,887.00 (+14.36%) | $99,463 (-0.91%) Land $66,575 Building $32,888 | $1,591,400 (+6.23%) Land $1,065,200 Building $526,200 |
| 2023 | $7,771.00 (+5.03%) | $100,373 (+15.86%) Land $67,831 Building $32,542 | $1,498,100 (+20.18%) Land $1,012,400 Building $485,700 |
| 2022 | $7,399.00 | $86,632 Land $55,579 Building $31,053 | $1,246,500 Land $799,700 Building $446,800 |
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 moderate risk |
|---|---|
| 500-Year Floodplain | Yes 0.2% annual chance |
| Nearest Special Flood Hazard Area | Zone AE, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on Record median of 15 policies |
| Community Rating System | Class 5 (25% premium discount) |
| Nearby Flood Policies | 15 in force |
| Nearby Flood Claims | 12 (1994–2013) |
| Claims Outside the SFHA | 4 of 12 |
| 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 | Moderate above 67% of the US · above 59% of Colorado |
|---|---|
| Wildfire Likelihood | 0.2% annual chance |
| Exposure | Indirect within 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 481 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 |
| Verizon Fixed Wireless | 300 / 20 |
| LiveWireNet Fixed Wireless | 250 / 100 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: Magnolia Road Internet Cooperative.
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