307 Union St, Sun Prairie, WI 53590 Property Records

Dane County property record for 307 Union St, Sun Prairie, WI 53590

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,309 sqft · built 1944
Lot Size	0.25 acres (10,890 sqft)
Owner	Individual Name on File
Last Sale	$420,000 (May 2026)
Tax Bill	$6,690 (2025)
Deeds & Mortgages	May 2026 Sale & Mortgage Jan 2023 Sale & Mortgage + 1 more
Flood Zone	Zone X (minimal risk)
APN	`0811-053-1700-9`

Property Details

APN / Parcel Number

Primary APN	`0811-053-1700-9`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Stories	1 Story
Building Area	1,309 sqft Living Area
1st Floor Area	1,309 sqft
Attic	Attic
Attic Area	308 sqft
Basement Area	844 sqft
Family Room	Family Room
Game Room	Game Room

Exterior

Year Built	Built 1944
Effective Year Built	Effective 1944
Architectural Style	Cape Cod
Lot Area	10,890 sqft (0.25 acres)
Garage Type	Attached
Garage Area	325 sqft
Parking Spaces	1 Parking Space

Exterior Amenities

Porch	Open Porch
Deck Area	280 sqft
Patio Area	600 sqft
Shed	1 Shed
Shed Area	96 sqft

Utilities, Heating & Cooling

Cooling System	HVAC
Heating System	Forced Air with A/C
Heating Fuel	Gas
Sewer	Connected
Water Source	Commercial

Location & Zoning

Street Address	307 UNION ST
City	SUN PRAIRIE
State	WI
Zip	53590-2111
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	SR4
Legal Description	ASSRS PLAT N 60 FT OUTLOT 30
Legal Range	11E
Legal Township	08N
Legal Section	05
Legal Subdivision	VILLAGE/SUN PRAIRIE
Legal Block	17
Legal Lot Number	30
Jurisdiction	DANE WI
Township / Civil Division	SUN PRAIRIE
Census Block Group	3
Census Block	3002
Census Tract	11505

Owner

307 Union St is owned and occupied by an individual who bought it in May 2026.

Source: Dane County records, as of June 9, 2026

Owner of Record	Individual Name on File
Mailing Address	307 UNION ST, SUN PRAIRIE, WI 53590-2111
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Husband and Wife

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Deeds, Mortgages & Sale History

Date	Document
May 27, 2026	Warranty Deed, Transfer · Conventional Mortgage EQUITABLE BANK S S B
Jan 13, 2023	Warranty Deed, Transfer · Conventional Mortgage UNIVERSITY OF WISCONSIN CU
Sep 2, 2020	Warranty Deed, Transfer · Conventional Mortgage WINTRUST MORTGAGE CORP

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	May 27, 2026 · Amount on File
Deed Sale	May 27, 2026 · Amount on File
Prior Sale	Jan 13, 2023 · Amount on File
Deed Document Number	20266101546
Record Updated	Oct 29, 2026

May 2026: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	DANE WI
Recording Date	May 27, 2026
Property Address	307 UNION ST, SUN PRAIRIE, WI 53590-2111
Document Number	0006101546
Instrument Date	May 21, 2026
Instrument	20266101546
Transaction Type	Transfer
Record Updated	Jun 9, 2026
Title Company	KNIGHT BARRY TITLE

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$127,260.00
Amount Accuracy	Full Amount Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	307 UNION ST, SUN PRAIRIE, WI 53590-2111

Mortgage

Document Number	0006101547,
Date	May 27, 2026
Instrument	20266101547

Lender

Name	EQUITABLE BANK S S B

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	360 Months
Due	Jun 1, 2056

Interest

Rate Type	Fixed Rate
Rate	6.3%
Initial Type	Fixed Rate
Max Rate	-1%

January 2023: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	DANE WI
Recording Date	Jan 13, 2023
Property Address	307 UNION ST, SUN PRAIRIE, WI 53590-2111
Document Number	0005882212
Instrument Date	Jan 11, 2023
Instrument	5882212
Transaction Type	Transfer
Record Updated	Jun 9, 2026

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$1,035.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	307 UNION ST, SUN PRAIRIE, WI 53590-2111

Mortgage

Document Number	0005882213
Date	Jan 13, 2023
Instrument	5882213

Lender

Name	UNIVERSITY OF WISCONSIN CU
Type	Credit Union

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Feb 1, 2053

Interest

Rate Type	Adjustable Rate
Rate	5.75%
Adjustable	Adjustable Rate Rider
Change Frequency	6 Months
Min Rate At Change	2.75%
Max Rate At Change	10.7%
Index	Other

September 2020: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	DANE WI
Recording Date	Sep 2, 2020
Property Address	307 UNION ST, SUN PRAIRIE, WI 53590-2111
Document Number	0005632414
Instrument Date	Aug 28, 2020
Instrument	5632414
Transaction Type	Transfer
Record Updated	Jun 14, 2021

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$822.00
Amount Accuracy	Calculated from Transfer Tax
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	307 UNION ST, SUN PRAIRIE, WI 53590-2111

Mortgage

Document Number	0005632415
Date	Sep 2, 2020
Instrument	5632415

Lender

Name	WINTRUST MORTGAGE CORP

Agreement

Type	Conventional Mortgage
Amount	Amount on Record

Interest

Rate Type	Fixed Rate

Tax Assessment & Valuation

The 2025 property tax bill for 307 Union St was $6,690.

Source: Dane County assessment roll, as of March 16, 2026

Property Jurisdictions

Type	Name
State	Wisconsin
County	Dane County
Municipality	Sun Prairie City
Unified School District	Sun Prairie Area School District (PK - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2025	$6,690.00 Homeowner's exemption	$339,500 Land $66,100 Building $273,400	$385,000
2023		$339,500 Land $66,100 Building $273,400	$339,500 Land $66,100 Building $273,400
2022	$5,778.00

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Flood

FEMA maps place 307 Union St in Zone X, an area of minimal flood risk.

Source: FEMA National Flood Hazard Layer, effective September 20, 2026

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it

Values are read at the parcel center point; lenders make the official flood determination.

Wildfire

Wildfire risk around 307 Union St is low, with less than 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 96% of the US · lower than 90% of Wisconsin
Wildfire Likelihood	Under 0.01% annual chance
Exposure	Direct burnable vegetation

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water System	SUN PRAIRIE UTILITIES serves 39,300 people · EPA ID WI1130258
Water Source	Groundwater
Last State Inspection	Feb 2026
Lead	3 ppb (2023) action level 15 ppb

Violations Reported to EPA

Water Quality	Fluoride resolved · Jan 2023
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. The service area is an EPA estimate; the actual supplier may differ.

Internet Providers

Source: FCC Broadband Data Collection, based on 449 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
TDS Telecom Fiber	8,000 / 8,000
Spectrum Cable	1,000 / 1,000
Verizon Fixed Wireless	300 / 20
T-Mobile Fixed Wireless	100 / 20

May also be available: Bertram Communications, Frontier, LiteWire.

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