Sidney is a somewhat small city located in the state of Montana. With a population of 6,167 people and three associated neighborhoods, Sidney is the 15th largest community in Montana.

Sidney is a small city, and as such doesn't have a public transit system that people use to get to and from their jobs every day.

The rate of college-level education in Sidney is quite a bit lower than the national average among all cities of 21.84%: just 10.68% of people here over 25 have a bachelor's degree or an advanced degree.

The per capita income in Sidney in 2022 was $34,381, which is upper middle income relative to Montana, and middle income relative to the rest of the US. This equates to an annual income of $137,524 for a family of four. However, Sidney contains both very wealthy and poor people as well.

Sidney is a somewhat ethnically-diverse city. The people who call Sidney home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Sidney residents report their race to be White, followed by Native Hawaiian. Important ancestries of people in Sidney include German, Norwegian, Irish, Italian, and English.

The most common language spoken in Sidney is English. Other important languages spoken here include Spanish and Italian.