With 4,918 people, Johnstown is the 284th most populated city in the state of Ohio out of 1,213 cities. But watch out, Johnstown, because Pleasant Run with 4,898 people and Toronto with 4,882 people are right behind you.

The largest Johnstown racial/ethnic groups are White (94.8%) followed by Hispanic (4.4%) and Black (0.5%).

In 2015, the median household income of Johnstown residents was $56,210. Johnstown households made slightly more than Jeromesville households ($56,094) and Shawnee Hills CDPhouseholds ($56,078) . However, 5.3% of Johnstown residents live in poverty.

The median age for Johnstown residents is 31.5 years young.