The racial makeup of the city was 92.73% White, 2.19% Black or African American, 0.52% Native American, 3.03% Asian, 0.03% Pacific Islander, 0.53% from other races, and 0.98% from two or more races.
Males had a median income of ,750 versus ,154 for females. About 5.2% of families and 10.2% of the population were below the poverty line, including 8.6% of those under age 18 and 6.9% of those age 65 or over. Oshkosh's airport, Wittman Field or Wittman Regional Airport (KOSH), opened in 1927 as Oshkosh Airport Inc.
The Oshkosh All-Stars played in the National Basketball League from 1937-49, before the NBL and the Basketball Association of America merged to become the NBA.
Oshkosh reached the NBL's championship finals five times.
52.2% were of German and 6.3% Irish ancestry according to Census 2000.
There were 24,082 households out of which 27.3% had children under the age of 18 living with them, 44.3% were married couples living together, 9.1% had a female householder with no husband present, and 43.3% were non-families. Route 45 travels north to New London, Wisconsin and travels south to Fond du Lac along Lake Winnebago.