Boulder County property record for 431 Seward St, Lyons, CO 80540
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1 ba · 1,152 sqft · built 1903 |
| Lot Size | 0.24 acres (10,471 sqft) |
| Owner | Individual Name on Record |
| Tax Bill | $4,501 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1203-18-1-08-006 |
| Primary APN | 1203-18-1-08-006 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 5 Rooms |
| Stories | 2 Stories |
| Building Area | 1,152 sqft Living Area |
| Gross Area | 1,662 sqft |
| 1st Floor Area | 756 sqft |
| Upper Floors Area | 396 sqft |
| Interior Walls | Plaster |
| Year Built | Built 1903 |
|---|---|
| Effective Year Built | Effective 1903 |
| Architectural Style | A-Frame |
| Exterior Material | Wood Shingle |
| Construction Type | Frame |
| Roof Material | Asphalt |
| Lot Area | 10,471 sqft (0.24 acres) |
| Garage Type | Attached |
| Garage Area | 510 sqft |
| Parking Spaces | 2 Parking Spaces |
| Porch | Porch |
| Porch Area | 54 sqft |
| Heating System | Forced Air with A/C |
|---|
| Account Number | R0050330 |
|---|---|
| Street Address | 431 SEWARD ST |
| City | LYONS |
| State | CO |
| Zip | 80540-5046 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 10 BLK 1 NORTONVILLE |
| Legal Range | 70 |
| Legal Township | 3N |
| Legal Section | 18 |
| Legal Subdivision | NORTONVILLE - LY |
| Legal Block | 1 |
| Legal Lot Number | 10 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | LONGMONT |
| Census Block Group | 3 |
| Census Block | 3001 |
| Census Tract | 13601 |
Source: NPS National Register of Historic Places, as of August 1, 2026
| Historic District | Within the Lyons Sandstone Buildings listed 1980 · 13 contributing resources · NRIS 80000880 |
|---|
Federal listing alone does not restrict alterations; local historic district rules, which this data does not cover, may apply.
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 | PO BOX 374, LYONS, CO 80540-0374 |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Jun 20, 1962 |
| Deed Sale | Jun 20, 1962 |
| Deed Document Number | 1962702162 |
| Record Updated | Sep 20, 2026 |
Source: Boulder County assessment roll, as of June 15, 2026
| Type | Name |
|---|---|
| State | Colorado |
| County | Boulder County |
| Municipality | Lyons Town |
| Unified School District | St. Vrain Valley School District RE 1J (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $35,992 (+8.8%) Land $5,372 Building $30,620 | $529,300 (-) Land $79,000 Building $450,300 | |
| 2025 | $4,501.00 (+5.81%) | $33,082 (-16.17%) Land $4,938 Building $28,144 | $529,300 (-10.14%) Land $79,000 Building $450,300 |
| 2024 | $4,254.00 (+1.36%) | ||
| 2023 | $4,197.00 (+25.43%) | $39,463 (+45.37%) Land $4,583 Building $34,880 | $589,000 (+50.79%) Land $68,400 Building $520,600 |
| 2022 | $3,346.00 | $27,147 Land $4,198 Building $22,949 | $390,600 Land $60,400 Building $330,200 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
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 |
|---|---|
| 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 38 policies |
| Nearby Flood Policies | 38 in force |
| Nearby Flood Claims | 62 (1978–2013) |
| Claims Outside the SFHA | 4 of 62 |
| Most Recent Claim | Dec 2013 · other causes |
| 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 | High above 75% of the US · above 73% of Colorado |
|---|---|
| Wildfire Likelihood | 0.3% 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 | TOWN OF LYONS serves 2,990 people · EPA ID CO0107496 |
|---|---|
| Water Source | Purchased surface water from CITY OF LONGMONT |
| Last State Inspection | Nov 2022 |
| Lead | Under 1 ppb (2023–2025) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None 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 177 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Lyons Communications Fiber · Cable · Fixed Wireless | 1,000 / 1,000 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless | 100 / 20 |
May also be available: Rise Broadband.
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