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ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/WI/LAKE-KOSHKONONG

Lake Koshkonong ZIP codes, Wisconsin

No ZIP code is named for Lake Koshkonong, WI; addresses there use a neighbouring town's name. 3 ZIP codes cover it: 53538, 53534 and 53563.

USPS city name
0 ZIP codes
Overlapping the city
3 more
Population
1,010

Lake Koshkonong in numbers

About 1,010 people live in Lake Koshkonong, in 498 households. The median household income is $97,115 a year, 25% above the Wisconsin median of $77,485 (US: $80,734). The median owner-occupied home is valued at $370,300 (39% above the Wisconsin median), and median gross rent is $1,296 a month. The median age is 54.0; 27.2% of adults 25 and over hold a bachelor's degree or higher (33.4% across Wisconsin); the average commute takes 26 minutes.

Population1,010Lake Koshkonong1,010
Households498Lake Koshkonong498
Median age54.0Lake Koshkonong54.0Wisconsin40.2US 38.9
Median household income$97,115Lake Koshkonong$97,115Wisconsin$77,485US $80,734
Median home value$370,300Lake Koshkonong$370,300Wisconsin$266,500US $332,700
Median gross rent$1,296Lake Koshkonong$1,296Wisconsin$1,087US $1,413
Bachelor's degree or higher27.2%Lake Koshkonong27.2%Wisconsin33.4%US 35.7%
Mean commute25.6 minLake Koshkonong25.6 minWisconsin22.2 minUS 26.4 min
Population density72 / sq miLake Koshkonong72 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Lake Koshkonong CDP. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes covering Lake Koshkonong

These ZIP codes cover part of Lake Koshkonong but are addressed as somewhere else.

ZIP codes overlapping Lake Koshkonong
ZIP City Type Population Median income Median home
53534 Edgerton , WI Standard 12,241 $89,045 $294,900
53538 Fort Atkinson , WI Standard 18,813 $82,783 $245,900
53563 Milton , WI Standard 11,280 $89,528 $293,800

Map of Lake Koshkonong ZIP codes

535345353853563

The ZIP codes of Lake Koshkonong, WI, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Lake Koshkonong

The nearest larger towns are Milton (5,706 people, 5.9 mi), Fort Atkinson (12,463 people, 6.5 mi) and Edgerton (6,014 people, 6.7 mi).

Towns near Lake Koshkonong
TownPopulationDistance
Milton 5,706 5.9 mi
Fort Atkinson 12,463 6.5 mi
Edgerton 6,014 6.7 mi
Whitewater 15,807 10.5 mi
Jefferson 7,732 11.9 mi
Janesville 66,030 12.7 mi
Deerfield 2,541 14.7 mi
Stoughton 13,033 14.9 mi
Lake Mills 6,470 15.1 mi
Johnson Creek 3,362 17.4 mi
Evansville 5,782 18.9 mi
McFarland 9,160 20.5 mi
Cottage Grove 8,513 20.9 mi
Marshall 3,778 22.3 mi

More nearby: every ZIP code in Rock County · Wisconsin ZIP codes

Cite this page

zipcodes.pro. “Lake Koshkonong, WI ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/wi/lake-koshkonong

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