The population of New Carlisle has a median age of 36.2 years. Approximately 26% of the city's residents are under the age of 18. Twenty-four percent of residents are between the ages of 25 and 44. Twenty-one percent of the population is 65 or older. The city has a skewed gender balance. Males make up 47.7% of the workforce while females make up 52.3%. The city is served by the Tecumseh Local School District. Prior to fall 1989, this district was known as New Carlisle-Bethel. However, a part of New Carlisle is still annexed to Bethel Local Schools in Miami County.
The median property value in New Carlisle is $91,500, which is 0.38 times smaller than the national average. The median house value increased by 0.109% from 2018 to 2019, while the median household income stayed the same. There are 57% of New Carlisle residents who own their home. The median income for residents of New Carlisle is $26,400. There are about two cars per household.
The city's population is home to numerous churches, including the First Baptist Church and the Park Layne Church of God. The church of the Brethren, for example, has a free meal for those who can't afford to pay for a meal. The First Baptist Church also features gospel rock music during services. The town is home to many college-educated adults. In addition, New Carlisle's crime rate is lower than the national average.