Demographics of Sidney city, Montana

Sidney city, Montana had 6,217 people on July 1, 2025, by the Census Bureau’s estimate: −140 since July 2020. Age, income, poverty, housing and origin below come from the survey, averaged over 2020–2024, each with its margin of error.

Sidney city, in four figures

6,217
Population: July 1, 2025, Vintage 2025 estimate. The survey’s 2020–⁠2024 figure is 6,171 ±15.; −2.2%
Change since July 2020: −140 people.; 37.3 ±3.1
Median age: ACS 2020–⁠2024.; $62,538 ±$13,627
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. The Bureau publishes no births, deaths or migration for a place, so the change is the difference between one July estimate and the next.

Sidney city, Montana's population shrank 2.2% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Sidney city, Montana's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — incorporated places and New England towns

About this chart

The figures

Sidney city, Montana's population shrank 2.2% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Sidney city, Montana's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	6,357	100.0	100.0
2021	6,229	98.0	100.2
2022	6,127	96.4	100.7
2023	6,070	95.5	101.6
2024	6,051	95.2	102.5
2025	6,217	97.8	103.1

Population of Sidney city, Montana on July 1 of each year, Vintage 2025
July 1	Population	Change
2020	6,357	—
2021	6,229	−128
2022	6,127	−102
2023	6,070	−57
2024	6,051	−19
2025	6,217	+166

Age, 2020–2024

The median age is 37.3 ±3.1: for men 37.1 ±5.4 and for women 37.3 ±2.6. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Sidney city by age, ACS 2020–2024
Age	People	Share	Montana	United States
Under 5	347 ±97	5.6% ±1.6	5.2% ±<0.1	5.6% ±<0.1
5 to 17	1,215 ±225	19.7% ±3.6	15.8% ±0.2	16.3% ±<0.1
18 to 24	517 ±161	8.4% ±2.6	9.0% ±0.2	9.1% ±<0.1
25 to 44	1,785 ±218	28.9% ±3.5	25.8% ±0.2	26.9% ±<0.1
45 to 64	1,469 ±234	23.8% ±3.8	24.1% ±0.2	24.8% ±<0.1
65 and over	838 ±165	13.6% ±2.7	20.1% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $62,538 ±$13,627, and income per person $45,385 ±$7,383, in 2024 dollars. The median is $72,509 ±$761 in Montana and $80,734 ±$166 in the United States.

Households by income

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Households in Sidney city by income, ACS 2020–2024
Household income	Households	Share	Montana	United States
Under $25,000	381 ±131	15.2% ±5.1	15.0% ±0.4	14.6% ±<0.1
$25,000 to $49,999	547 ±164	21.8% ±6.3	19.4% ±0.5	16.7% ±<0.1
$50,000 to $74,999	490 ±153	19.6% ±5.9	17.3% ±0.4	15.5% ±<0.1
$75,000 to $99,999	50 to 188	2.0% to 7.5%	13.6% ±0.4	12.6% ±<0.1
$100,000 to $149,999	437 ±134	17.4% ±5.1	17.4% ±0.4	17.5% ±<0.1
$150,000 to $199,999	194 ±75	7.7% ±2.9	8.2% ±0.3	9.6% ±<0.1
$200,000 or more	337 ±146	13.5% ±5.7	9.0% ±0.3	13.4% ±0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Sidney city by age, ACS 2020–2024
Age	Below poverty	Rate	Montana	United States
All ages	473 ±208	7.7% ±3.4	11.5% ±0.3	12.5% ±0.1
Under 18	32 to 168	2.2% to 10.7%	12.7% ±0.6	16.1% ±0.1
18 to 59	48 to 250	1.4% to 7.4%	11.7% ±0.4	11.6% ±0.1
60 and over	101 to 347	9.3% to 28.2%	10.3% ±0.4	11.0% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Housing, 2020–2024

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Housing in Sidney city, ACS 2020–2024
Measure	Sidney city	Montana	United States
Housing units	3,198 ±154	528,419 ±3,257	143,775,355 ±10,234
Occupied	78.3% ±5.5	86.8% ±0.5	89.9% ±0.1
Vacant	21.7% ±7.0	13.2% ±0.3	10.1% ±0.1
Owner occupied	57.6% ±6.0	69.2% ±0.6	65.2% ±0.3
Renter occupied	42.4% ±6.3	30.8% ±0.4	34.8% ±0.1
Median home value	$236,900 ±$19,665	$375,800 ±$3,433	$332,700 ±$236
Median gross rent	$931 ±$65	$1,081 ±$14	$1,413 ±$2
Median year built	1980 ±5	1981 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Sidney city by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Montana	United States
Hispanic or Latino	496 ±83	8.0% ±1.3	4.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	5,172 ±156	83.8% ±2.5	83.6% ±0.2	57.4% ±<0.1
Black alone, not Hispanic	0 to 16	0% to 0.3%	0.4% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 37	0% to 0.6%	0.8% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 14	< 0.1% to 0.2%	5.3% ±0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	61 ±30	1.0% ±0.5	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 16	0% to 0.3%	0.5% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	421 ±140	6.8% ±2.3	4.7% ±0.2	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Sidney city by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Montana	United States
Born in the state	3,583 ±287	58.1% ±4.6	52.1% ±0.5	57.3% ±<0.1
Born in another state	2,334 ±292	37.8% ±4.7	44.8% ±0.4	26.9% ±<0.1
Born a citizen outside the states	0 to 116	0% to 1.9%	0.8% ±0.1	1.7% ±<0.1
Born abroad	197 ±76	3.2% ±1.2	2.3% ±0.1	14.1% ±<0.1
Naturalized citizens	0 to 72	< 0.1% to 1.2%	1.2% ±0.1	7.4% ±<0.1
Not citizens	161 ±64	2.6% ±1.0	1.1% ±0.1	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Sidney city among the places of Montana

18th of 26 places of 5,000 or more by the survey’s 2020–2024 count. Every one is listed on the Montana page.

Places of Montana near Sidney city in population, ACS 2020–2024
Place	ACS 2020–⁠2024
Whitefish city	8,749 ±26
Miles City city	8,407 ±22
Helena Valley West Central CDP	8,056 ±922
Laurel city	7,215 ±18
Lockwood CDP	7,181 ±807
Sidney city	6,171 ±15
Lewistown city	6,087 ±41
Four Corners CDP	5,791 ±905
Columbia Falls city	5,615 ±15
Orchard Homes CDP	5,588 ±636
Bigfork CDP	5,565 ±459

Sources

Census Bureau population estimates — incorporated places and New England towns — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026