Blair, WI has a population of 1,324 and is the 13,448th largest city in the United States. The population density is 307 per sq mi which is 251% higher than the Wisconsin average and 239% higher than the national average. The median age in Blair is 39 which is approximately 1% lower than the Wisconsin average of 39. In Blair, 58% of the population over 15 years of age are married, 95% speak English and 3% speak Spanish. 77% of Blair residents were born in Wisconsin, 21% were born out of state, 0% were born outside of the United States and 2% were foreign born.