Delavan, WI has a population of 8,410 and is the 4,514th largest city in the United States. The population density is 1,209 per sq mi which is 1283% higher than the Wisconsin average and 1235% higher than the national average. The median age in Delavan is 35 which is approximately 10% lower than the Wisconsin average of 39. In Delavan, 60% of the population over 15 years of age are married, 75% speak English and 22% speak Spanish. 56% of Delavan residents were born in Wisconsin, 28% were born out of state, 1% were born outside of the United States and 15% were foreign born.