The population of Westerville City is estimated at around 61,700 people. Of that number, 6% were born outside the U.S.; however, 56% of them were naturalized U.S. citizens. The remaining 42% of residents were born outside of the United States and entered the country before 2010. The city's growth is primarily attributed to international migration, which has contributed 24% of its overall growth. The population of African-Americans grew by 100 percent and that of Hispanics increased by 3%. The median household size in Westerville is about 2.67 people and a family of three is about three.
The most livable months in Westerville are September, June, and August. January is the coldest month. However, the city does have many residents who do not drive. A recent census showed that nearly one-third of the population is commuting by car. While the city has many bus lines, the service is not frequent or widespread. The city's streets have a typical suburban pattern.
A look at the number of people who own cars in Westerville, OH shows that 67.5% of residents own their own vehicles. This percentage is significantly higher than the national average of 64.1%, but it is lower than the US average of 70.1%. And while a majority of Westerville residents own one car, only 1.49% of them own two. This suggests that the population of Westerville, OH is not overly dependent on automobiles for transportation.