Boulder County property record for 1601 Mariposa Ave, Boulder, CO 80302
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 1.75 ba · 1,838 sqft · built 1941 |
| Lot Size | 0.238 acres (10,349 sqft) |
| Owner | Company Name on File |
| Last Sale | $1,450,000 (Aug 2023) |
| Tax Bill | $7,805 (2025) |
| Deeds & Mortgages | Aug 2023 Sale Mar 2021 Transfer |
| Flood Zone | Zone X (moderate risk) |
| APN | 1577-06-2-06-004 |
| Primary APN | 1577-06-2-06-004 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1.75 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 1,838 sqft Living Area |
| Gross Area | 2,143 sqft |
| 1st Floor Area | 987 sqft |
| Basement Area | 987 sqft |
| Finished Basement | 851 sqft |
| Unfinished Basement | 136 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1941 |
|---|---|
| Effective Year Built | Effective 1970 |
| Architectural Style | Ranch |
| Exterior Material | Wood Shingle |
| Construction Type | Frame |
| Roof Material | Asphalt |
| Lot Area | 10,349 sqft (0.238 acres) |
| Porch | Enclosed Porch |
|---|---|
| Porch Area | 169 sqft |
| Deck Area | 408 sqft |
| Shed | 1 Shed |
| Total Buildings | 2 Buildings |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0003686 |
|---|---|
| Street Address | 1601 MARIPOSA AVE |
| City | BOULDER |
| State | CO |
| Zip | 80302-7926 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 7 & W 1/2 LOT 8 & VAC ALLEY ADJ BLK 9 FLORAL PARK |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 06 |
| Legal Subdivision | FLORAL PARK & WEIHOFEN RESUB - BO |
| Legal Block | 9 |
| Legal Lot Number | 7 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 1 |
| Census Block | 1009 |
| Census Tract | 12505 |
1601 Mariposa Ave is owned by a company that bought it in August 2023.
Source: Boulder County records, as of September 18, 2026
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | PO BOX 7249, BOULDER, CO 80306-7249 |
| Owner Type | Company |
| Vesting | Limited Liability Company |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Aug 28, 2023 | Special Warranty Deed, Transfer LAND TITLE GUARANTY COMPANY IN, LAND TITLE GUARANTEE COMPANY |
| Mar 23, 2021 | Intrafamily Transfer, Transfer |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Aug 28, 2023 · Amount on File |
| Deed Sale | Aug 28, 2023 · Amount on File |
| Prior Sale | May 4, 1981 · Amount on File |
| Deed Document Number | 20234019548 |
| Prior Transfer Date | Mar 18, 2021 |
| Prior Transfer Doc | 0003870126 |
| Record Updated | Oct 29, 2026 |
| Document Type | Special Warranty Deed |
|---|---|
| Jurisdiction | BOULDER CO |
| Recording Date | Aug 28, 2023 |
| Property Address | 1601 MARIPOSA AVE, BOULDER, CO 80302-7926 |
| Document Number | 0004019548 |
| Map Reference | DOC 47776 |
| Instrument Date | Aug 25, 2023 |
| Instrument | 4019548 |
| Transaction Type | Transfer |
| Record Updated | Sep 27, 2023 |
| Title Company | LAND TITLE GUARANTY COMPANY IN, LAND TITLE GUARANTEE COMPANY |
| Amount | Amount on Record |
|---|---|
| Tax | $145.00 |
| Amount Accuracy | Full Amount Stated |
| Additional |
|
| Name | Verified Name |
|---|---|
| Address | 1601 MARIPOSA AVE, BOULDER, CO 80302-7926 |
| Name | Verified Name |
|---|---|
| Address | PO BOX 7249, BOULDER, CO 80306-7249 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | BOULDER CO |
| Recording Date | Mar 23, 2021 |
| Property Address | 1601 MARIPOSA AVE, BOULDER, CO 80302-7926 |
| Document Number | 0003870126 |
| Map Reference | MB 825 PG 409 |
| Instrument Date | Mar 18, 2021 |
| Instrument | 3870126 |
| Transaction Type | Transfer |
| Record Updated | Mar 31, 2022 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants with Right of Survivorship |
| Address | 1601 MARIPOSA AVE, BOULDER, CO 80302-7926 |
The 2025 property tax bill for 1601 Mariposa Ave was $7,805.
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 | $83,388 (+2.92%) Land $72,379 Building $11,009 | $1,296,300 (-) Land $1,134,400 Building $161,900 | |
| 2025 | $7,805.00 | $81,019 Land $70,900 Building $10,119 | $1,296,300 Land $1,134,400 Building $161,900 |
| 2023 | $6,387.00 (+4.47%) | $83,482 (+14.69%) Land $72,239 Building $11,243 | $1,246,000 (+18.97%) Land $1,078,200 Building $167,800 |
| 2022 | $6,114.00 | $72,790 Land $59,186 Building $13,604 | $1,047,340 Land $851,600 Building $195,740 |
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 1601 Mariposa Ave in Zone X, an area of moderate flood risk, within 100 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 moderate risk |
|---|---|
| 500-Year Floodplain | Yes 0.2% annual chance |
| Nearest Special Flood Hazard Area | Zone AE, within 100 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on File 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.
Wildfire risk around 1601 Mariposa Ave is moderate, ranking above 67% of the US, with a 0.3% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 67% of the US · above 60% of Colorado |
|---|---|
| Wildfire Likelihood | 0.3% annual chance |
| Exposure | Indirect within ember reach |
| Adjoins Burnable Land | Yes |
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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