Town · Maine
Sidney, Maine
Sidney, town, in Kennebec County, Maine. Sidney had 4,929 residents on July 1, 2025 by the Census Bureau's estimate, up 6.2% since 2020; the 2020 Census counted 4,645 and the ACS 2020-2024 5-year estimates put it at 4,790 (±18). GEOID 2301168385.
Residents, July 2025 estimate
4,929
Census Bureau estimate (no margin published)
2020 Census count: 4,645 · ACS 2020-2024: 4,790 ±18
Median household income
$83,488
±$9,776 (90% margin)
Maine: $74,733
Median home value
$336,200
±$33,519 (90% margin)
Maine: $296,600
Median gross rent
$1,340
±$304 (90% margin)
Maine: $1,139
Where is Sidney and what county is it in?
Sidney is a town in Kennebec County, Maine. It covers 42.2 square miles of land, 110 residents per square mile in 2020.
Sidney is in the Augusta-Waterville, ME micropolitan statistical area (Census Bureau delineation, July 2023).
Sidney is the same area as Census Tract 170 of Kennebec County: the tract's figures are Sidney's own.
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Sidney, and is it growing?
The Census Bureau estimates that 4,929 people lived in Sidney on July 1, 2025, up 6.2% since 2020, faster than Maine (+3.8%). The 2020 Census counted 4,645 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 4,790 (±18).
| Measure | Sidney | Kennebec County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 4,790±18 | 126,808 | +430 |
| Households | 1,889±144 | 54,312 | +234 |
| Average household size | 2.52±0.19 | 2.25 | no clear change |
| Housing units | 2,111±174 | 63,521 | no clear change |
Sidney's population since 2000
From 3,514 in 2000 to 4,929 in 2025: up 40.3%. The 2000, 2010 and 2020 figures are census counts, each for Sidney as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Sidney?
The median resident of Sidney is 43.0 years old; 23.1% are under 18 and 18.4% are 65 or older. The largest group is non-Hispanic white residents at 94.5%, then non-Hispanic residents of two or more races at 3.0%. 3.0% of residents were born outside the United States.
| Measure | Sidney | Kennebec County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 43.0±5.5 | 43.7 | no clear change |
| Under 18 years | 23.1%±3.5 pts | 18.7% | – |
| 65 years and over | 18.4%±3.7 pts | 21.1% | – |
| Male | 49.0%±4.2 pts | 48.9% | – |
| Hispanic or Latino (any race) | 0.6%±1.1 pts | 2.3% | – |
| White alone, not Hispanic | 94.5%±2.9 pts | 91.8% | −3.6 pts |
| Black or African American alone, not Hispanic | 0.1%±0.3 pts | 0.9% | – |
| Asian alone, not Hispanic | 1.7%±1.4 pts | 0.9% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.6 pts | 0.2% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.6 pts | 0.0% | – |
| Two or more races, not Hispanic | 3.0%±2.2 pts | 3.7% | – |
| Some other race alone, not Hispanic | 0.0%±0.6 pts | 0.4% | – |
| Born outside the United States | 3.0%±1.7 pts | 2.4% | – |
| Speak a language other than English at home (age 5+) | 7.1%±3.1 pts | 4.8% | – |
| Civilian veterans (age 18+) | 7.5%±2.7 pts | 9.5% | – |
| With a disability | 9.3%±2.3 pts | 16.9% | – |
| No health insurance coverage | 7.0%±6.0 pts | 5.8% | – |
| High school graduate or higher (age 25+) | 95.9%±2.6 pts | 94.8% | – |
| Bachelor's degree or higher (age 25+) | 33.5%±7.0 pts | 31.9% | no clear change |
| Graduate or professional degree (age 25+) | 17.9%±6.2 pts | 12.2% | – |
| Lived in the same house a year earlier | 80.8%±8.6 pts | 88.0% | – |
| Moved from another state in the past year | 1.7%±2.0 pts | 1.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Sidney earn?
Half of Sidney's 1,889 households earn less than $83,488 a year (±$9,776), against $69,077 in Kennebec County and $74,733 in Maine. In 2015-2019 it was $80,437 in 2024 dollars; the margins of error cannot tell the two periods apart. 6.4% of residents live below the poverty line.
| Measure | Sidney | Kennebec County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $83,488±$9,776 | $69,077 | no clear change |
| Mean household income | $112,456±$16,124 | $88,742 | – |
| Per capita income | $44,614±$5,745 | $38,597 | +$9,324 |
| People below the poverty line | 6.4%±3.9 pts | 11.6% | no clear change |
| Children under 18 below the poverty line | 7.8%±10.0 pts | 15.1% | – |
| Households receiving SNAP | 5.2%±3.0 pts | 13.6% | – |
| Households with a computer | 96.0%±3.1 pts | 95.0% | – |
| Households with a broadband subscription | 94.8%±2.8 pts | 91.1% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Sidney?
Owners occupy 89.4% of Sidney's occupied homes and renters 10.6%. The median owner-occupied home is valued at $336,200 by its owner (±$33,519). The median renter pays $1,340 a month including utilities.
| Measure | Sidney | Kennebec County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $336,200±$33,519 | $238,200 | +$106,306 |
| Median gross rent | $1,340±$304 | $992 | no clear change |
| Renters paying 35% or more of income on rent | 0.0%±15.8 pts | 38.5% | – |
| Median monthly owner costs, with a mortgage | $1,671±$280 | $1,499 | – |
| Owner-occupied homes | 89.4%±5.3 pts | 73.7% | no clear change |
| Renter-occupied homes | 10.6%±5.3 pts | 26.3% | – |
| Housing units | 2,111±174 | 63,521 | no clear change |
| Homeowner vacancy rate | 2.5%±3.2 pts | 0.9% | – |
| Rental vacancy rate | 0.0%±12.8 pts | 1.8% | – |
| Single-family detached homes | 92.9%±3.3 pts | 67.7% | – |
| Mobile homes | 4.0%±2.6 pts | 9.9% | – |
| Built 2020 or later | 3.1%±2.6 pts | 1.0% | – |
| Built 2010 to 2019 | 20.7%±8.1 pts | 5.7% | – |
| Built 1939 or earlier | 8.2%±4.7 pts | 22.5% | – |
| Households with no vehicle | 0.4%±0.6 pts | 7.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Sidney building?
Builders took permits for 25 new housing units in Sidney in 2025 (25 in single-family houses), 5.1 per 1,000 residents against 4.9 across Maine.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Sidney work and get to work?
76.5% of Sidney's workers drive alone and 14.3% work from home. The average trip to work takes 24.8 minutes.
| Measure | Sidney | Kennebec County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 65.5%±5.9 pts | 60.1% | – |
| Unemployment rate | 5.4%±3.8 pts | 3.9% | – |
| Drove alone to work | 76.5%±7.7 pts | 73.7% | – |
| Carpooled | 4.8%±3.1 pts | 6.8% | – |
| Public transportation | 0.0%±1.2 pts | 0.2% | – |
| Walked | 0.0%±1.2 pts | 2.4% | – |
| Worked from home | 14.3%±5.9 pts | 15.3% | no clear change |
| Mean travel time to work | 24.8 min±2.5 | 25.4 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Sidney?
1 census tract lies mostly in Sidney (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 170Kennebec County | 4,790 | $83,488 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Sidney) · Census block assignment files
How does Sidney compare with other places in Maine?
By the Census Bureau's July 2025 estimates, Sidney is the 2,335th-most populous of the 16,079 U.S. towns and townships that have one and the 51st-most populous of 454 in Maine.
Sidney ranks 117th of 349 places in Maine with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 51st | 454 |
| Growth 2020-2025 (PEP) | 45th | 273 |
| Residents per square mile | 179th | 353 |
| Median household income | 117th | 349 |
| Per capita income | 120th | 353 |
| Median home value | 100th | 352 |
| Median gross rent | 67th | 301 |
| Poverty rate | 224th | 277 |
| Bachelor's degree or higher | 146th | 352 |
| Median age | 235th | 353 |
| Owner-occupied share | 71st | 353 |
| Work from home | 148th | 275 |
| Travel time to work | 181st | 352 |
Sidney's figures with every place in Maine (CSV)
Every place in Maine, sortable · Compare Sidney with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Sidney?
18 of the 57 figures for Sidney on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Sidney are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.