Boulder County property record for 4860 Sioux Dr, Boulder, CO 80303
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1.75 ba · 1,744 sqft · built 1959 |
| Lot Size | 0.26 acres (11,316 sqft) |
| Owner | Company Name on File |
| Last Sale | $693,500 (Jan 2018) |
| Tax Bill | $5,360 (2025) |
| Deeds & Mortgages | Jan 2018 Sale |
| Flood Zone | Zone AE (high risk) |
| APN | 1577-04-3-01-016 |
| Primary APN | 1577-04-3-01-016 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1.75 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 7 Rooms |
| Stories | 1 Story |
| Building Area | 1,744 sqft Living Area |
| Gross Area | 2,224 sqft |
| 1st Floor Area | 1,744 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1959 |
|---|---|
| Effective Year Built | Effective 1969 |
| Architectural Style | Ranch |
| Exterior Material | Brick Veneer |
| Construction Type | Masonry / Concrete Block |
| Lot Area | 11,316 sqft (0.26 acres) |
| Garage Type | Attached |
| Garage Area | 480 sqft |
| Parking Spaces | 2 Parking Spaces |
| Patio Area | 468 sqft |
| Cooling System | Central |
|---|---|
| Heating System | Forced Air with A/C |
| Account Number | R0015332 |
|---|---|
| Street Address | 4860 SIOUX DR |
| City | BOULDER |
| State | CO |
| Zip | 80303-3824 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 16 BLK 6 KEEWAYDIN |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 04 |
| Legal Subdivision | KEEWAYDIN - BO |
| Legal Block | 6 |
| Legal Lot Number | 16 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 1 |
| Census Block | 1006 |
| Census Tract | 12511 |
4860 Sioux Dr is owned by a company that bought it in January 2018.
Source: Boulder County records, as of September 18, 2026
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | 350 PONCA PL, BOULDER, CO 80303-3828 |
| Owner Type | Company |
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 | Name on Deed |
|---|---|
| Last Sale | Jan 23, 2018 · Amount on File |
| Deed Sale | Jan 23, 2018 · Amount on File |
| Prior Sale | Nov 19, 1981 |
| Deed Document Number | 20183637451 |
| Record Updated | Oct 29, 2026 |
| Document Type | Warranty Deed |
|---|---|
| Jurisdiction | BOULDER CO |
| Recording Date | Jan 23, 2018 |
| Property Address | 4860 SIOUX DR, BOULDER, CO 80303-3824 |
| Document Number | 0003637451 |
| Instrument Date | Jan 22, 2018 |
| Instrument | 3637451 |
| Transaction Type | Transfer |
| Record Updated | Jan 30, 2018 |
| Title Company | LAND TITLE GUARANTEE |
| Amount | Amount on Record |
|---|---|
| Tax | $69.35 |
| Amount Accuracy | Confirmed |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Company |
| Address | 4860 SIOUX DR BOULDER CO 803033824, BOULDER, CO 80303-3824 |
The 2025 property tax bill for 4860 Sioux Dr was $5,360, up 1.1% from the year before.
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 | $55,488 (+0.2%) Land $46,267 Building $9,221 | $886,000 (-) Land $750,400 Building $135,600 | |
| 2025 | $5,360.00 (+1.11%) | $55,375 Land $46,900 Building $8,475 | $886,000 Land $750,400 Building $135,600 |
| 2024 | $5,301.00 (+1.82%) | ||
| 2023 | $5,206.00 (+14.97%) | $63,107 (+31.58%) Land $56,206 Building $6,901 | $941,900 (+36.49%) Land $838,900 Building $103,000 |
| 2022 | $4,528.00 | $47,962 Land $40,400 Building $7,562 | $690,100 Land $581,300 Building $108,800 |
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.
FEMA maps place 4860 Sioux Dr in Zone AE, a high-risk flood area; flood insurance is required for federally backed loans.
Source: FEMA National Flood Hazard Layer, effective October 14, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone AE high risk |
|---|---|
| 100-Year Floodplain | Yes 1% annual chance |
| Floodway | No |
| Base Flood Elevation | Varies along the reach; see FIRM |
| Flood Insurance Requirement | Required federally backed loans |
| Flood Insurance Cost | Premium on File median of 67 individual policies |
| Community Rating System | Class 5 (25% premium discount) |
| Nearby Flood Policies | 174 units insured incl. 107 condo units |
| Nearby Flood Claims | 107 (1982–2023) |
| Claims Outside the SFHA | 83 of 107 |
| Most Recent Claim | Sep 2023 · rainfall accumulation |
| 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 4860 Sioux Dr is low, with a 0.01% annual chance of wildfire.
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 | 0.01% 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 331 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Ayva Networks Fixed Wireless | 2,500 / 2,500 |
| 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: AT&T, CenturyLink.
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