Ozaukee County, Wisconsin

Founding: 1853
Parent county: Washington

Namesake: The Ojibwe word for the Sauk tribe
Seat: Port Washington (1853–)

Land area: 233 square miles

Population (2020): 91,503

Population (historic): 15,682 (1860); 15,461 (1880); 16,363 (1900); 17,394 (1930)

Periods of population growth: pre-1860; 1890–1910; 1920–2020

Subdivisions: Three cities; five villages; one CDP; six towns

National Register listings: 41

Pre-1940 residences (estimated): 4,367 (11.7%)
Pre-1940 housing survival rate: 79.6%
Pre-1860 housing survival rate (1940): 9%

Farm housing in disrepair (1950): 2.1%

Average farmhouse value (1930): $2,732
Average outbuilding value (1930): $2,637
Average farmhouse size (1940): 7.3 rooms
Number of farms (1920): 1,727
Average farm size (1920): 62.4 acres
Sources of settlement: Germany, Luxembourg, Belgium, and New York
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Port Washington

Namesake: George Washington, U.S. president

Founding: 1835 (platting); 1849 (post office); 1882 (incorporation)

Population (2020): 12,353

Population (historic): 1,386 (1880); 3,010 (1900); 3,693 (1930)

Periods of population growth: pre-1880–1910; 1920–1970; 1980–2020
Pre-1940 residences (estimated): 963 (18.4%)
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Outstanding Buildings

1. *Watry House (1853). 1820 Dixie Road. Belgium.
2. *Michael Toeckes Farm (c. 1890). 2585 Jay Road. Belgium. Eastlake.
3. *Michael Hickey House (c. 1855). 7026 Cedar Creek Road. Cedarburg. Razed.
4. *Eilert Stallmann House (1865). 5314 Columbia Road. Cedarburg. Italianate.
5. *Frederick Behrens Farm (c. 1885). 1587 Road I. Cedarburg. Italianate.
6. *Charles Hintze House (1869). 189 Green Bay Road. Cedarburg. Italianate.
7. *Concordia Mill (1853). 252 Green Bay Road. Cedarburg. Greek Revival.
8. *Edward Janssen House (1854). 5060 Hamilton Road. Cedarburg. Greek Revival.
9. *Nicolaus Ludowissi Farm (c. 1890). 2946 Jay Road. Fredonia. Queen Anne.
10. *Johann Hennings Farm (1872). 1143 Lakefield Road. Grafton.
11. *Henry Hennings House (1884). 754 Port Washington Road. Grafton.
12. *Thomas Irwin Farm (c. 1870). 1235 East Sauk Road. Grafton. Italianate.
13. *Trinity Lutheran Church (1902). 10001 Cedarburg Road. Mequon. Gothic Revival.
14. *Edwin Nieman House (1928). 13030 Cedarburg Road. Mequon. Tudor Revival.
15. *Jonathan Clark House (1848). 13615 Cedarburg Road. Mequon.
16. *Zinke House (1897/1910s). 828 Mequon Road. Mequon. Queen Anne.
17. *Ludwig Hilgendorf Farm (c. 1845). 11401 Mequon Road. Mequon.
18. *John O'Brien Farm (1846). 12510 Wauwatosa Road. Mequon.
19. *John Reichert House (c. 1885). 14053 Wauwatosa Road. Mequon. Stick.
20. *Philipp Schumacher House (c. 1875). 2595 Road I. Saukville.