Town · Maine
Mercer, Maine
Mercer, town, in Somerset County, Maine. Mercer had 713 residents on July 1, 2025 by the Census Bureau's estimate, up 0.4% since 2020; the 2020 Census counted 709 and the ACS 2020-2024 5-year estimates put it at 718 (±112). GEOID 2302545110.
Residents, July 2025 estimate
713
Census Bureau estimate (no margin published)
2020 Census count: 709 · ACS 2020-2024: 718 ±112
Median household income
$71,107
±$1,586 (90% margin)
Maine: $74,733
Median home value
$238,500
±$31,664 (90% margin)
Maine: $296,600
Median gross rent
$1,422
±$249 (90% margin)
Maine: $1,139
Where is Mercer and what county is it in?
Mercer is a town in Somerset County, Maine. It covers 26.7 square miles of land, 27 residents per square mile in 2020.
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Mercer, and is it growing?
The Census Bureau estimates that 713 people lived in Mercer on July 1, 2025, up 0.4% since 2020, slower than Maine (+3.8%). The 2020 Census counted 709 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 718 (±112).
| Measure | Mercer | Somerset County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 718±112 | 50,959 | no clear change |
| Households | 340±58 | 23,209 | no clear change |
| Average household size | 2.11±0.25 | 2.16 | −0.43 |
| Housing units | 510±76 | 30,137 | no clear change |
Mercer's population since 2000
From 647 in 2000 to 713 in 2025: up 10.2%. The 2000, 2010 and 2020 figures are census counts, each for Mercer 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 Mercer?
The median resident of Mercer is 43.4 years old; 20.1% are under 18 and 25.9% are 65 or older. The largest group is non-Hispanic white residents at 73.3%, then Hispanic or Latino residents (of any race) at 9.5%. 8.8% of residents were born outside the United States.
| Measure | Mercer | Somerset County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 43.4±4.5 | 47.0 | −11.1 |
| Under 18 years | 20.1%±6.0 pts | 18.4% | – |
| 65 years and over | 25.9%±5.5 pts | 23.0% | – |
| Male | 42.5%±6.3 pts | 49.8% | – |
| Hispanic or Latino (any race) | 9.5%±8.1 pts | 1.5% | – |
| White alone, not Hispanic | 73.3%±10.2 pts | 93.8% | −23.2 pts |
| Black or African American alone, not Hispanic | 0.0%±3.8 pts | 0.5% | – |
| Asian alone, not Hispanic | 8.5%±5.0 pts | 0.4% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±3.8 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±3.8 pts | 0.0% | – |
| Two or more races, not Hispanic | 6.8%±3.8 pts | 3.4% | – |
| Some other race alone, not Hispanic | 1.9%±2.8 pts | 0.2% | – |
| Born outside the United States | 8.8%±5.1 pts | 1.5% | – |
| Speak a language other than English at home (age 5+) | 3.2%±2.8 pts | 2.2% | – |
| Civilian veterans (age 18+) | 10.1%±5.3 pts | 10.7% | – |
| With a disability | 12.3%±4.0 pts | 19.4% | – |
| No health insurance coverage | 4.0%±2.3 pts | 7.5% | no clear change |
| High school graduate or higher (age 25+) | 92.4%±6.4 pts | 93.2% | – |
| Bachelor's degree or higher (age 25+) | 34.1%±9.8 pts | 21.1% | +16.5 pts |
| Graduate or professional degree (age 25+) | 9.0%±3.7 pts | 5.8% | – |
| Lived in the same house a year earlier | 92.3%±4.7 pts | 88.9% | – |
| Moved from another state in the past year | 1.9%±1.9 pts | 2.1% | – |
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 Mercer earn?
Half of Mercer's 340 households earn less than $71,107 a year (±$1,586), against $58,179 in Somerset County and $74,733 in Maine. In 2015-2019 the median was $62,999 in 2024 dollars, so it rose by $8,108 after inflation. 13.6% of residents live below the poverty line.
| Measure | Mercer | Somerset County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $71,107±$1,586 | $58,179 | +$8,108 |
| Mean household income | $80,426±$12,157 | $76,305 | – |
| Per capita income | $33,450±$5,365 | $34,433 | no clear change |
| People below the poverty line | 13.6%±5.9 pts | 14.2% | no clear change |
| Children under 18 below the poverty line | 11.8%±10.4 pts | 14.8% | – |
| Households receiving SNAP | 5.3%±3.1 pts | 17.7% | – |
| Households with a computer | 92.9%±4.2 pts | 93.0% | – |
| Households with a broadband subscription | 93.2%±3.9 pts | 86.3% | – |
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 Mercer?
Owners occupy 92.1% of Mercer's occupied homes and renters 7.9%. The median owner-occupied home is valued at $238,500 by its owner (±$31,664). The median renter pays $1,422 a month including utilities.
| Measure | Mercer | Somerset County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $238,500±$31,664 | $166,900 | +$83,063 |
| Median gross rent | $1,422±$249 | $910 | +$633 |
| Renters paying 35% or more of income on rent | 18.5%±22.9 pts | 34.8% | – |
| Median monthly owner costs, with a mortgage | $1,450±$349 | $1,299 | – |
| Owner-occupied homes | 92.1%±4.7 pts | 77.4% | no clear change |
| Renter-occupied homes | 7.9%±4.7 pts | 22.6% | – |
| Housing units | 510±76 | 30,137 | no clear change |
| Homeowner vacancy rate | 3.7%±4.0 pts | 0.3% | – |
| Rental vacancy rate | 0.0%±52.5 pts | 2.3% | – |
| Single-family detached homes | 86.3%±5.1 pts | 75.8% | – |
| Mobile homes | 11.6%±4.8 pts | 14.7% | – |
| Built 2020 or later | 0.4%±0.8 pts | 0.8% | – |
| Built 2010 to 2019 | 17.3%±6.5 pts | 6.1% | – |
| Built 1939 or earlier | 13.9%±5.1 pts | 21.4% | – |
| Households with no vehicle | 2.1%±1.5 pts | 5.8% | – |
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 do people in Mercer work and get to work?
78.5% of Mercer's workers drive alone and 20.5% work from home. The average trip to work takes 30.3 minutes.
| Measure | Mercer | Somerset County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 53.8%±6.9 pts | 55.7% | – |
| Unemployment rate | 3.5%±3.8 pts | 3.5% | – |
| Drove alone to work | 78.5%±7.5 pts | 76.5% | – |
| Carpooled | 1.0%±1.4 pts | 8.4% | – |
| Public transportation | 0.0%±9.1 pts | 0.1% | – |
| Walked | 0.0%±9.1 pts | 3.0% | – |
| Worked from home | 20.5%±7.5 pts | 11.0% | +11.6 pts |
| Mean travel time to work | 30.3 min±3.9 | 28.0 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 Mercer?
No census tract lies mostly in Mercer; 1 tract reaches into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 9670Somerset County | 2,130 | $74,519 |
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 Mercer) · Census block assignment files
How does Mercer compare with other places in Maine?
By the Census Bureau's July 2025 estimates, Mercer is the 8,937th-most populous of the 16,079 U.S. towns and townships that have one and the 298th-most populous of 454 in Maine.
Mercer is not ranked by income or the other survey measures: those rankings include places of 1,000 or more residents (2020 Census) with a reliable estimate.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 298th | 454 |
Mercer's figures with every place in Maine (CSV)
Every place in Maine, sortable · Compare Mercer 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 Mercer?
17 of the 57 figures for Mercer 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 Mercer 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.