Winnebago County property record for 339 W 20th Ave, Oshkosh, WI 54902
| Property Type | General Industrial |
|---|---|
| Details | 27,323 sqft · built 1958 |
| Lot Size | 5.93 acres (258,311 sqft) |
| Owner | 2 Company Names on Record |
| Tax Bill | $18,749 (2024) |
| Deeds & Mortgages | Sep 2021 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 14-11250000 |
| Primary APN | 14-11250000 |
|---|---|
| Alternative APN |
|
| Building Area | 27,323 sqft Building Perimeter |
|---|
| Year Built | Built 1958 |
|---|---|
| Effective Year Built | Effective 1958 |
| Lot Area | 258,311 sqft |
| Account Number | 914-11250000 |
|---|---|
| Street Address | 339 W 20TH AVE |
| City | OSHKOSH |
| State | WI |
| Zip | 54902-7066 |
| Property Category | Industrial |
| Property Type | Industrial > General Industrial |
| Local Zoning Code | M2 |
| Legal Description | LOTS 115 THRU 133 ALSO LOTS 135 THRU 147 ALSO VAC W 22ND AVEBETW IOWA & MONTANA STS ALSO VAC IOWA ST BETW W 20TH AVE &WISCONSIN CENTRAL RR R/W ALSO N1/2 OF VAC W 23RD AVE LYG |
| Legal Lot Number | 2 |
| Jurisdiction | WINNEBAGO WI |
| Township / Civil Division | OSHKOSH |
| Census Block Group | 3 |
| Census Block | 3009 |
| Census Tract | 1500 |
Source: Winnebago County records, as of May 27, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | 2 Company Names on Record |
|---|---|
| Mailing Address | PO BOX 2566, OSHKOSH, WI 54903-2566 |
| Owner Type | Company |
| Vesting | Company |
| Deed Names | 2 Names on Deed |
|---|---|
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | WINNEBAGO WI |
| Property Address | 339 W 20TH AVE, OSHKOSH, WI 54902-7066 |
| Transaction Type | Mortgage |
| Record Updated | Jun 26, 2023 |
| Name | Verified Name |
|---|
| Document Number | 0001863459 |
|---|---|
| Date | Sep 20, 2021 |
| Instrument | 1863459 |
| Name | PROSPERITY HOME MORTGAGE LLC |
|---|---|
| Type | Mortgage Company |
| Address | CHANTILLY, VA 20151 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Oct 1, 2051 |
Source: Winnebago County assessment roll, as of May 27, 2026
| Type | Name |
|---|---|
| State | Wisconsin |
| County | Winnebago County |
| Municipality | Oshkosh City |
| Unified School District | Oshkosh Area School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $994,900 (+44.78%) Land $282,600 Building $712,300 | ||
| 2024 | $18,749.00 (-7.97%) | ||
| 2023 | $20,373.00 (-2.74%) | $687,200 Land $198,100 Building $489,100 | $993,020 Land $286,259 Building $706,761 |
| 2022 | $20,948.00 |
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 March 26, 2019 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 3 in force |
| Nearby Flood Claims | 1 (2008) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Jun 2008 · Severe Storms, Tornadoes, And Flooding |
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 | Not rated no burnable land 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 | OSHKOSH WATERWORKS serves 63,000 people · EPA ID WI4710457 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Apr 2025 |
| Lead | 6 ppb (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. This system sells water to local utilities; the supplier billing this address may be one of them.
Source: FCC Broadband Data Collection, based on 308 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber | 5,000 / 5,000 |
| Spectrum Cable | 1,000 / 1,000 |
| Verizon Fixed Wireless | 300 / 20 |
| Bertram Communications Fixed Wireless | 100 / 20 |
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