|— Village —|
|• Total||5.10 sq mi (13.21 km2)|
|• Land||5.06 sq mi (13.11 km2)|
|• Water||0.04 sq mi (0.10 km2)|
|Elevation||709 ft (216 m)|
|• Estimate (2011)||11,481|
|• Density||2,264.6/sq mi (874.4/km2)|
|Time zone||Central (CST) (UTC-6)|
|• Summer (DST)||CDT (UTC-5)|
|GNIS feature ID||1583294|
Notable people 
- Peter Cunningham, race car driver
- Charles Guiteau, assassin
- Susan Lynn Hefle, scientist
- Frank J. Weber, legislator and union organizer
- Ralph Zaun, legislator and businessman
Grafton is located at (43.317904, -87.954113).
According to the United States Census Bureau, the village has a total area of 5.10 square miles (13.21 km2), of which, 5.06 square miles (13.11 km2) of it is land and 0.04 square miles (0.10 km2) is water.
2010 census 
As of the census of 2010, there were 11,459 people, 4,863 households, and 3,192 families residing in the village. The population density was 2,264.6 inhabitants per square mile (874.4 /km2). There were 5,125 housing units at an average density of 1,012.8 per square mile (391.0 /km2). The racial makeup of the village was 95.5% White, 0.8% African American, 0.3% Native American, 1.7% Asian, 0.6% from other races, and 1.0% from two or more races. Hispanic or Latino of any race were 2.3% of the population.
There were 4,863 households out of which 29.9% had children under the age of 18 living with them, 54.1% were married couples living together, 8.2% had a female householder with no husband present, 3.4% had a male householder with no wife present, and 34.4% were non-families. 29.0% of all households were made up of individuals and 11% had someone living alone who was 65 years of age or older. The average household size was 2.36 and the average family size was 2.92.
The median age in the village was 40.7 years. 22.7% of residents were under the age of 18; 7.5% were between the ages of 18 and 24; 25.8% were from 25 to 44; 28.8% were from 45 to 64; and 15.3% were 65 years of age or older. The gender makeup of the village was 48.3% male and 51.7% female.
2000 census 
As of the census of 2000, there were 10,312 people, 4,048 households, and 2,878 families residing in the village. (As of January 1, 2009, the population is 11,470.) The population density was 2,552.0 people per square mile (985.5/km²). There were 4,165 housing units at an average density of 1,030.8 per square mile (398.0/km²). The racial makeup of the village was 97.72% White, 0.28% Black or African American, 0.24% Native American, 0.75% Asian, 0.01% Pacific Islander, 0.37% from other races, and 0.63% from two or more races. 1.60% of the population were Hispanic or Latino of any race.
There were 4,048 households out of which 34.5% had children under the age of 18 living with them, 61.4% were married couples living together, 7.2% had a female householder with no husband present, and 28.9% were non-families. 24.2% of all households were made up of individuals and 8.4% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 3.06.
In the village the population was spread out with 26.3% under the age of 18, 7.0% from 18 to 24, 31.4% from 25 to 44, 23.5% from 45 to 64, and 11.7% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 96.5 males. For every 100 females age 18 and over, there were 93.7 males.
The median income for a household in the village was $53,918, and the median income for a family was $65,825. Males had a median income of $45,451 versus $27,488 for females. The per capita income for the village was $25,948. About 0.6% of families and 1.7% of the population were below the poverty line, including 1.7% of those under age 18 and 5.1% of those age 65 or over.
Grafton is served by both the Grafton School District and the Cedarburg School District. Grafton is served by two high schools, one within the village, Grafton High School and a second in Cedarburg, Cedarburg High School.
- Grafton was home to Paramount Records, which produced blues and jazz records by artists between 1918 and 1935. Artists that recorded in their Grafton studio included Son House, Blind Lemon Jefferson, Blind Blake, Skip James, Papa Charlie Jackson, Ida Cox, and Ma Rainey.
- Grafton is home to the first Costco Store in Wisconsin, which opened on August 30, 2007.
- Grafton is home to the new Aurora Medical Center which opened in November 2010. This is the first "Green" hospital built by Aurora Health Care
- Grafton is home to the Cedarburg Woolen Co. Worsted Mill. The mill is listed on the National Register of Historic Places.
- "US Gazetteer files 2010". United States Census Bureau. Retrieved 2012-11-18.
- "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- "American FactFinder". United States Census Bureau. Retrieved 2012-11-18.
- "Population Estimates". United States Census Bureau. Retrieved 2013-01-02.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- Village of Grafton
- School District of Grafton
- Historical information on Grafton's Paramount Records
- Early History of Grafton is Recalled in Talk by Ralph Zaun