| City: | Squirrel Island, Maine |
| City Alias: | Boothbay Harbor, Boothbay Hbr, Squirrel Is |
| County: | Lincoln County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 8:03:58 PM |
| Population: | 16 [See All] |
| Area Code: | 207 |
| Classification: | PO Box |
| Coordinates: | 43.8090, -69.6306 |
| Land Area: | 0.273 sq mi |
| Quick Link: |
Squirrel Island sits off the coast of Boothbay Harbor, Maine, as one of New England's most exclusive summer communities. This tiny island supports just 16 year-round residents, but the seasonal transformation is dramatic. Of 108 total housing units, 88 are used only for seasonal, recreational, or occasional purposes. That's 81% seasonal occupancy, placing Squirrel Island among Maine's most vacation-dominant communities.
The island operates under rural route delivery despite its PO Box classification. One rural carrier route serves the two addresses on Main Street and general delivery at the post office. No PO Boxes are maintained at the island facility. Mail service connects through Boothbay Harbor, which appears as an accepted mailing alias. The island's point geometry shows it as a location within the larger Boothbay Harbor postal area (ZIP 04576).
Median age of 62.5 years points to an older, established seasonal community. Only 14 homes are occupied year-round, with 8 owner-occupied and 6 renter-occupied units. The remaining 94 homes sit vacant most of the year, awaiting summer residents. No businesses are registered on the island. The year-round population includes 5 white residents, 1 American Indian resident, 10 residents of two or more races, and 5 Hispanic residents.
Squirrel Island's postal identity has existed since before October 2004, when USPS tracking began. The abbreviated alias "Squirrel Is" was added in May 2005, and "Boothbay Hbr" followed in March 2007. All three island-specific names (Squirrel Island, Squirrel Is, and the primary name) are valid for mailing, as are the Boothbay Harbor variants. This reflects the island's operational connection to the mainland postal hub just 1.3 miles away across the water.
Only one street exists on the island: Main Street with two delivery addresses.
ZIP Code 04570 has 16 residents and 14 households (average 1.14 persons per household). The median age is 62.5 years, significantly older than the state (45.1) and significantly older than the nation (38.8). The gender split is 43.8% male and 56.3% female, which is lower than the national male share (49.1%), making this a female-majority area. Largest groups are White (31.3%, much lower than the state average of 90.8% and well below the national average of 61.6%) and Hispanic or Latino (6.3%); Hispanic or Latino residents make up 6.3%, which is much lower than the national average (18.7%).
Explore More: Population Over Time By Age & Gender By Race By Gender Nativity & Citizenship
| 2020 Population: | 16Source: Census DHC |
| 2024 ACS Population Estimate: | 3Source: Census ACS |
| 2026 ZC Population Estimate: | 0Source: ZIP-Codes.com |
| Population Density: | 58.6 people per sq mile |
| Average Income: | $0Source: Census ACS |
| Households: | 14Source: Census DHC |
| Average House Value: | $666,666,666Source: Census ACS |
| Persons Per Household: | 1.14Source: Census DHC |
| Average Family Size: | 1.33Source: Census ACS |
| Group | 2010 | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Census ACS Population Estimate | -- | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
| Decennial Census | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 16 | -- | -- | -- | -- |
Median Age: 62.5
Male Median Age: 59.5
Female Median Age: 63.5
| Group | < 5 | 5-9 | 10-14 | 15-19 | 20-24 | 25-29 | 30-34 | 35-39 | 40-44 | 45-49 | 50-54 | 55-59 | 60-64 | 65-69 | 70-74 | 75-79 | 80-84 | 85+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Male | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 2 | 0 | 1 | 0 | 0 |
| Female | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | 1 | 1 | 0 | 2 | 0 |
| Total | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 2 | 3 | 1 | 1 | 2 | 0 |
| White: | 5 | 71.43% |
| Black: | 0 | 0% |
| Hispanic:* | 1 | 14.29% |
| Asian: | 0 | 0% |
| American Indian: | 1 | 14.29% |
| Hawaiian: | 0 | 0% |
| Other: | 0 | 0% |
| Total: | 7 | 100% |
| Gender | Count | % | Median Age |
|---|---|---|---|
| Males: | 7 | 43.75% | 59.5 years |
| Females: | 9 | 56.25% | 63.5 years |
| Total: | 16 | 100% | 62.5 years |
| Native, born in the United States: | 3 | 100.00% |
| Native, born in PR, Island Areas, or abroad: | 0 | 0.00% |
| Foreign born, naturalized U.S. citizen: | 0 | 0.00% |
| Foreign born, not a U.S. citizen: | 0 | 0.00% |
| Total Population: | 3 | 100% |
| Total Native Population: | 3 | 100.00% |
| Total Foreign-born Population: | 0 | 0.00% |
In 2024, the Median household income is $0, which is well under the national median ($78,538), and above its 2019 pre-pandemic level by $0. Family households earn a median of $0 versus $0 for nonfamily households (a difference of $0). By gender, male median income is $0 and female is $0, which is considerably lower than the national female median ($53,445), with a current gap of $0 that has stayed about the same from 2011 to 2024. The labor-force participation rate is 100.0%, which is far greater than the national rate (63.5%). The unemployment rate is 0.0%, which is markedly below the national rate (5.2%). The largest occupation group is Management (100.0%).
Explore More: Income Over Time Household Income Employment Status By Occupation
| Income Type | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Household Income | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Median Family Income | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Median NonFamily Income | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Median Male Income | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Median Female Income | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Employed: | 3 | 100.00% |
| Unemployed: | 0 | 0.00% |
| Not In Labor Force: | 0 | 0.00% |
| Total: | 3 | 100% |
| Management, business, science, and arts: | 3 | 100.00% |
| Service: | 0 | 0.00% |
| Sales and Office: | 0 | 0.00% |
| Natural resources, construction, and maintenance: | 0 | 0.00% |
| Production, transportation, and material moving: | 0 | 0.00% |
| Total Civilian Employed Population: | 3 | 100% |
In 2024, the median home value is $0, which is much lower than the national median ($303,400), and above its 2019 pre-pandemic level by $0. The median gross rent is $0, which is well under the national median ($1,348), and above its 2019 pre-pandemic level by $0. Insufficient data for owner/renter mix. Insufficient data for vacancy rate.
Explore More: Compare Home Value Home Value Over Time Rent & Over Time Housing Occupancy
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Home Value | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Less than $500: | 0 | 0% |
| $500 to $999: | 0 | 0% |
| $1,000 to $1,499: | 0 | 0% |
| $1,500 to $1,999: | 0 | 0% |
| $2,000 to $2,499: | 0 | 0% |
| $2,500 to $2,999: | 0 | 0% |
| $3,000 or more: | 0 | 0% |
| No Rent: | 0 | 0% |
| Total: | 0 | 100% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Rent | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Owner Occupied (with mortgage): | 0 | 0.00% |
| Owner Occupied (free and clear, no mortgage): | 3 | 100.00% |
| Renter Occupied: | 0 | 0.00% |
| Total Occupied Housing Units: | 3 | 100% |
| Occupied Housing Units: | 3 | 3.95% |
| Vacant Housing Units (not graphed): | 73 | 96.05% |
| Total Housing Units: | 76 | 100% |
| Single-Family Units: | 76 | 100.00% |
| Multi-Family Units: | 0 | 0.00% |
| Other Units: | 0 | 0.00% |
| Total Housing Units: | 76 | 100% |
In 2024, 100.00% of adults (25+) have a bachelor's degree or higher, which is comparable to the national rate (35.00%). High school or higher is 100.00%, which is comparable to the national rate (89.40%). The uninsured rate is 0.00%, which is comparable to the national rate (8.60%). The share of people in poverty is -666,666,666.00%, which is far lower than the national rate (8.70%). Poverty has been broadly stable, which may reflect structural barriers or offsetting gains and setbacks. Insufficient data for school enrollment.
Explore More: Educational Attainment Health Insurance Poverty Over Time School Enrollment
| Less than 9th grade: | 0 | 0.00% |
| 9th to 12th grade, no diploma: | 0 | 0.00% |
| High school graduate (includes equivalency): | 0 | 0.00% |
| Some college, no degree: | 0 | 0.00% |
| Associate's degree: | 0 | 0.00% |
| Bachelor's degree: | 3 | 100.00% |
| Graduate or professional degree: | 0 | 0.00% |
| Total: | 3 | 100% |
| High school or higher: | 3 | 100.00% |
| Bachelor's degree or higher: | 3 | 100.00% |
| Private Insurance: | 3 | 100.00% |
| Public Insurance: | 0 | 0.00% |
| No Insurance: | 0 | 0.00% |
| Total: | 3 | 100% |
| Has Health Insurance: | 3 | 100.00% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % of People in Poverty | 0.0% | -666,666,666.0% | -666,666,666.0% | -666,666,666.0% | -666,666,666.0% | -666,666,666.0% | -666,666,666.0% | -666,666,666.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% |
Note: Counts of Families & People in poverty are not published at the ZIP Code level due to small sample sizes. Percentages shown are survey estimates from the American Community Survey (ACS). They may differ from official poverty statistics. The U.S. Census Bureau defines poverty status by comparing a family's or individual's total income with federal poverty thresholds that vary by family size and composition.
| Nursery School, Preschool: | 0 | 0% |
| Kindergarten: | 0 | 0% |
| Elementary school (grades 1-8): | 0 | 0% |
| High school (grades 9-12): | 0 | 0% |
| College or graduate school: | 0 | 0% |
| Total: | 0 | 100% |
| Early Childhood: | 0 | 0% |
| K-12 (Primary & Secondary School): | 0 | 0% |
ZIP Code 04570 is designated for PO Box delivery only; business establishment and employment data are not available.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 0Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 0Source: CBP |
| 1st Quarter Payroll: | $0Source: CBP |
| Annual Payroll: | $0Source: CBP |
| # of Employees: | 0Source: CBP |
ZIP Code 04570 is located in Lincoln County, Maine, within the Metropolitan Statistical Area (CBSA ) and Maine's 1st Congressional District. This area has a population of 0 people, about 0.00% of whom live in ZIP Code 04570. It covers 0.273 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | --Source: Census |
| CBSA Number: | --Source: Census |
| CBSA Type: | --Source: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 0Source: Census |
| MSA: | Source: Census |
| Land Area: | 0.273 sq miSource: Census |
| Water Area: | --Source: Census |
| Congressional District: | 01Source: USPS |
| Congressional Land Area: | 3285.52 sq miSource: Census |
| PMSA: | Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | --Source: Census |
| Place Name: | --Source: Census |
We could not locate which school district 04570 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on March 1, 2026.