Sidney is a somewhat small city located in the state of Montana. With a population of 6,031 people and three associated neighborhoods, Sidney is the 15th largest community in Montana. Sidney has seen a significant amount of newer housing growth in recent years. Quite often, new home construction is the result of new residents moving in who are middle class or wealthier, attracted by jobs, a healthy local economy, or other amenities as they leave nearby or far away areas for greener pastures. This seems to be the case in Sidney, where the median household income is $62,538.00.

Also of interest is that Sidney has more people living here who work in computers and math than 95% of the places in the US.

As is often the case in a small city, Sidney doesn't have a public transportation system that people use for their commute.

The education level of Sidney citizens is a little higher than the average for US cities and towns: 22.02% of adults in Sidney have at least a bachelor's degree.

The per capita income in Sidney in 2022 was $45,385, which is wealthy relative to Montana, and upper middle income relative to the rest of the US. This equates to an annual income of $181,540 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 Italian and Spanish.