ZIP Codes of Lincoln County, ME

Population & People
Population & People
Total Population
36,099
Household Income
Household Income
Median Income
$84,026
Housing
Housing
Total Housing Units
23,904
Business & Economy
Business & Economy
Total Businesses
1,380
Employment
Employment
Employment Rate
54.77%
Education
Education
Bachelor's Degree+
40.23%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 28 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:28 ZIP Codes (24 Standard, 4 PO Box, 0 Unique) [See All]
Area Code:207
Timezone:Eastern (GMT -05:00)
Local Time:2:12:30 PM
Population:36,099 [See All]
FIPS:23015
Land Area:505 sq mi
Water Area:87 sq mi
Coordinates:43.9658, -69.5601
Quick Link:
https://www.zip-codes.com/county/me-lincoln.asp
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Extreme geographic sprawl
The largest ZIP spans 210× the smallest by area — 81.9 sq mi down to 0.39.
Maine's oldest county
Median age 50.9.
Striking education divide
Bachelor's share spans 27.2% to 75.3% — a 48-point gap.

Standout ZIPs in this County


Most Populous
Waldoboro · 5,253 people
14.6% of county total
Highest Income
Round Pond · $132,604 median
1.6× county average
Largest Land Area
Jefferson · 81.9 sq mi
Spans the most ground
Fastest Growth
Bristol · 25.0% (10-yr)
1,165 → 1,456 residents
Most Educated
Newcastle · 45.1% bachelor's+
620 of 1,374 adults 25+

Things worth knowing about Lincoln County


36,099 residents live across 28 ZIPs covering 505 sq mi, served by 28 distinct USPS-recognized cities.

Population moved from 34,237 to 36,057 from 2014 to 2024 — a +5.3% change. 19 ZIPs gained residents, 7 lost.

The county's wealthiest ZIP 04564 (Round Pond, $132,604 median) and poorest ZIP 04568 (South Bristol, $54,478) are 7.2 miles apart — a 2.4× income gap across local geography.

Median home values vary 2.7× across this county — from $240,100 in 04342 (Dresden) to $641,300 in 04575 (West Boothbay Harbor).

Density varies 14× across the county — from 39 people/sq mi in 04535 (Alna) to 524 in 04575 (West Boothbay Harbor).

Educational attainment ranges from 27.2% bachelor's+ in 04348 (Jefferson) to 75.3% in 04564 (Round Pond) — the breadth of educational profiles across the area.

Within Maine, this is the #13 most populous of 16 counties and ranks #5 for median household income with the #5 fastest decade growth .

Weighted by population, the typical household earns about $79,625 across the county — reflecting what a typical resident sees, not a simple ZIP average.

40.2% of adults age 25+ hold a bachelor's degree or higher (11,269 of 28,013 reporting).

24 Standard delivery, 4 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Lincoln County


Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
505
square miles
Avg density
71.5
people per sq mi
Population
36,099
across 28 ZIPs
Jefferson
81.9 sq mi
3,484 residents
Waldoboro
78.3 sq mi
5,253 residents
Whitefield
47.5 sq mi
2,115 residents

All ZIP Codes in Lincoln County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
04572WaldoboroStandard5,253$69,10778.34.3%
04578WiscassetStandard4,709$81,06341.24.2%
04348JeffersonStandard3,484$78,92981.917.4%
04543DamariscottaStandard2,192$59,42314.79.5%
04353WhitefieldStandard2,115$73,87547.5-9.5%
04553NewcastleStandard1,913$89,86832.77.8%
04555NobleboroStandard1,906$100,41723.112.0%
04538Boothbay HarborStandard1,810$56,5005.0-7.5%
04537BoothbayStandard1,685$76,66720.7-21.4%
04342DresdenStandard1,645$74,84432.7-5.5%
04539BristolStandard1,456$96,11118.425.0%
04556EdgecombStandard1,251$108,75020.68.4%
04544East BoothbayStandard978$59,3753.663.8%
04551BremenStandard917$100,00018.52.6%
04535AlnaStandard818$93,12521.225.8%
04573WalpoleStandard557$86,25011.213.0%
04576SouthportStandard547$89,3755.3-12.1%
04564Round PondStandard520$132,6048.820.1%
04554New HarborStandard514$85,2884.6-31.0%
04568South BristolStandard512$54,4785.111.5%
04571TrevettStandard439$58,8303.221.9%
04558PemaquidStandard382$91,4775.057.2%
04575West Boothbay HarborPO Box286$116,2500.5429.6%
04852MonheganPO Box1200.8207.7%
04541ChamberlainStandard450.4-70.4%
04341Coopers MillsPO Box420.0
04570Squirrel IslandPO Box30.0
04549Isle Of SpringsStandard0.0

Adjacent & Nearby Counties