Natrona County property record for 321 Riverview Ave, Mills, WY 82644
| Property Type | Mixed Use Commercial Office / Residential |
|---|---|
| Details | 2,400 sqft · built 1947 |
| Lot Size | 0.257 acres (11,200 sqft) |
| Owner | Company Name on File |
| Tax Bill | $1,404 (2026) |
| Flood Zone | Zone X (moderate risk) |
| APN | 3379-07-22-5-00300 |
| Primary APN | 3379-07-22-5-00300 |
|---|---|
| Alternative APNs |
|
| Units | 6 Units |
|---|---|
| Stories | 2 Stories |
| Building Area | 2,400 sqft Total Area |
| Flooring | Carpet |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1947 |
|---|---|
| Effective Year Built | Effective 1947 |
| Exterior Material | Block |
| Construction Type | Masonry / Concrete Block |
| Fire Resistance | Masonry Walls, Wood Interior |
| Roof Type | Flat |
| Roof Material | Rolled Roofing |
| Lot Area | 11,200 sqft (0.257 acres) |
| Garage Type | Detached |
| Garage Area | 1,448 sqft |
| Parking Spaces | 6 Parking Spaces |
| Heating System | Hot Water |
|---|
| Account Number | R0012652 |
|---|---|
| Street Address | 321 RIVERVIEW AVE |
| City | MILLS |
| State | WY |
| Zip | 82644-5008 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Mixed Use Commercial Office / Residential |
| Legal Description | MILLS BLK 11 LOT 5-6 COMMERCIAL |
| Legal Range | 79W |
| Legal Township | 33N |
| Legal Section | 07 |
| Legal Subdivision | MILLS |
| Legal Block | 11 |
| Legal Lot Number | 5,6 |
| Jurisdiction | NATRONA WY |
| Township / Civil Division | CASPER |
| Census Block Group | 1 |
| Census Block | 1092 |
| Census Tract | 1100 |
321 Riverview Ave, a commercial property, is owned by a company.
Source: Natrona County records, as of September 29, 2026
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | 1035 ASPEN DR, CASPER, WY 82601-5311 |
| Owner Type | Company |
| Vesting | 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 |
|---|---|
| Record Updated | Oct 29, 2026 |
The 2026 property tax bill for 321 Riverview Ave was $1,404.
Source: Natrona County assessment roll, as of July 7, 2026
| Type | Name |
|---|---|
| State | Wyoming |
| County | Natrona County |
| Municipality | Mills Town |
| Unified School District | Natrona County School District 1 (KG - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $1,404.00 | $19,266 (-6.86%) Land $1,431 Building $17,835 | $202,809 (-6.85%) Land $15,065 Building $187,744 |
| 2025 | $1,404.00 | $20,684 Land $2,173 Building $18,511 | $217,725 Land $22,870 Building $194,855 |
| 2023 | $18,939 Land $4,175 Building $14,764 | $199,351 Land $43,951 Building $155,400 | |
| 2022 | $1,380.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 321 Riverview Ave in Zone X, an area of moderate flood risk, though there have been 1 flood claim nearby since 1983.
Source: FEMA National Flood Hazard Layer, effective January 2, 2020 · 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 |
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 3 in force |
| Nearby Flood Claims | 1 (1983) |
| Most Recent Claim | Jul 1983 · tidal / storm surge |
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 321 Riverview Ave 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 94% of Wyoming |
|---|---|
| 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 MILLS serves 4,050 people · EPA ID WY5600036 |
|---|---|
| Water Source | Groundwater influenced by surface water |
| Last State Inspection | Aug 2022 |
| Lead | Under 1 ppb (2023–2025) action level 15 ppb |
| Water Quality | Total trihalomethanes resolved · Jan 2025 |
|---|---|
| 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 203 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Spectrum Cable · Fiber in parts of the area | 1,000 / 1,000 |
| Mountain West Technologies Fixed Wireless · Fiber in parts of the area | 300 / 50 |
| Visionary Broadband Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless | 100 / 20 |
May also be available: Bluepeak, Verizon.
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