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. Much of the housing stock in Sidney was built relatively recently. The construction of new real estate can often be taken as an indication that the local Sidney economy is robust, and that jobs or other amenities are attracting an influx of new residents. 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.

Being a small city, Sidney does not have a public transit system used by locals to get to and from work.

The population of Sidney overall has a level of education that is slightly above the US average for all US cities and towns of 21.84%. Of adults 25 and older in Sidney, 22.02% 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.