ZIP Codes of Penobscot County, ME

Population & People
Population & People
Total Population
156,987
Household Income
Household Income
Median Income
$64,453
Housing
Housing
Total Housing Units
77,503
Business & Economy
Business & Economy
Total Businesses
4,268
Employment
Employment
Employment Rate
57.36%
Education
Education
Bachelor's Degree+
30.27%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 47 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:47 ZIP Codes (43 Standard, 3 PO Box, 1 Unique) [See All]
Area Code:207
Timezone:Eastern (GMT -05:00)
Local Time:2:12:30 PM
Population:156,987 [See All]
FIPS:23019
CBSA:Bangor, ME
Land Area:4,764 sq mi
Water Area:203 sq mi
Coordinates:45.0993, -68.7746
Quick Link:
https://www.zip-codes.com/county/me-penobscot.asp
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Top 3 most populous in Maine
#3 of 16 counties in Maine, with 156,987 residents.
Maine's largest county by area
Spans 4,764 sq mi — the largest of 16 counties.
Extreme education divide
Bachelor's share ranges 4.6% to 66.9% across ZIPs — a 62-point gap.
Notable income spread
Median income ranges $42,011 to $106,554 across ZIPs — a 2.5× gap.
Wide geographic spread
ZIPs range from 1264.4 sq mi down to 12.09 — a 105× sprawl ratio.

Standout ZIPs in this County


Most Populous
Bangor · 44,854 people
28.6% of county total
Highest Income
Hampden · $106,554 median
1.7× county average
Largest Land Area
Millinocket · 1,264.4 sq mi
Spans the most ground
Fastest Growth
Orono · 32.4% (10-yr)
2,666 → 3,531 residents
Most Educated
Orono · 66.9% bachelor's+
2,965 of 4,432 adults 25+

Things worth knowing about Penobscot County


156,987 residents live across 47 ZIPs covering 4,764 sq mi, served by 45 distinct USPS-recognized cities.

Population moved from 155,621 to 156,987 from 2014 to 2024 — a +0.9% change. 26 ZIPs gained residents, 19 lost.

The county's wealthiest ZIP 04444 (Hampden, $106,554 median) and poorest ZIP 04430 (East Millinocket, $42,011) are 66.8 miles apart — a 2.5× income gap across local geography.

Median home values vary 3.6× across this county — from $86,200 in 04430 (East Millinocket) to $313,600 in 04429 (Holden).

Density varies 2539× across the county — from 3 people/sq mi in 04765 (Patten) to 6,586 in 04469 (Orono).

Educational attainment ranges from 4.6% bachelor's+ in 04460 (Medway) to 66.9% in 04473 (Orono) — the breadth of educational profiles across the area.

Within Maine, this is the #3 most populous of 16 counties and ranks #10 for median household income .

Hosts 1 single-entity Unique ZIP: 04469University Of Maine .

Weighted by population, the typical household earns about $68,978 across the county — reflecting what a typical resident sees, not a simple ZIP average.

30.3% of adults age 25+ hold a bachelor's degree or higher (34,282 of 113,259 reporting).

43 Standard delivery, 3 PO Box only, 1 single-entity Unique ZIPs serve this county.

Stories about Penobscot County


Higher-education hub

1 ZIP in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.

Orono
66.9%
8,371 residents

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
4,764
square miles
Avg density
33.0
people per sq mi
Population
156,987
across 47 ZIPs
Millinocket
1,264.4 sq mi
4,464 residents
Patten
552.8 sq mi
1,434 residents
Springfield
306.3 sq mi
838 residents

All ZIP Codes in Penobscot County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
04401BangorStandard44,854$66,932100.9-0.3%
04412BrewerStandard9,652$66,61315.72.8%
04444HampdenStandard9,371$106,55471.86.5%
04468Old TownStandard9,291$56,358129.3-1.3%
04473OronoStandard8,371$61,52821.16.7%
04457LincolnStandard5,823$56,645236.3-0.6%
04429HoldenStandard5,008$97,24477.69.0%
04462MillinocketStandard4,464$51,5271,264.4-6.6%
04930DexterStandard4,258$54,13762.80.7%
04474OrringtonStandard3,853$94,55627.83.5%
04469OronoUnique3,5310.532.4%
04428EddingtonStandard3,334$72,85761.01.0%
04953NewportStandard3,143$60,36536.8-1.3%
04461MilfordStandard3,095$85,11148.11.3%
04456LevantStandard3,069$86,07130.15.8%
04427CorinthStandard2,990$64,22943.36.4%
04419CarmelStandard2,941$82,18835.75.3%
04928CorinnaStandard2,192$56,54739.412.2%
04493West EnfieldStandard1,840$61,56379.8-10.2%
04418GreenbushStandard1,649$60,500140.10.4%
04411BradleyStandard1,645$76,66751.615.8%
04448HowlandStandard1,540$54,750147.90.1%
04430East MillinocketStandard1,495$42,01112.1-18.3%
04765PattenStandard1,434$50,286552.813.4%
04450KenduskeagStandard1,333$79,79216.00.3%
04969PlymouthStandard1,319$61,96430.82.0%
04410BradfordStandard1,254$82,95540.512.6%
04434EtnaStandard1,252$72,37925.1-3.6%
04449HudsonStandard1,251$67,69238.9-12.8%
04932DixmontStandard1,207$75,95236.70.3%
04488StetsonStandard1,151$76,02336.6-7.0%
04422CharlestonStandard1,117$75,25038.9-12.4%
04460MedwayStandard1,111$49,583146.1-10.3%
04435ExeterStandard1,093$84,40838.58.0%
04455LeeStandard925$49,88682.2-27.1%
04487SpringfieldStandard838$48,000306.3-10.4%
04939GarlandStandard823$51,09438.1-32.9%
04453LagrangeStandard785$59,25078.54.5%
04459MattawamkeagStandard750$48,75092.7-9.4%
04777StacyvilleStandard478$53,472109.614.1%
04475PassadumkeagStandard384$55,41722.5-17.1%
04417BurlingtonStandard355$46,094174.337.6%
04495WinnStandard287$36,33336.2-43.5%
04451KingmanStandard217$31,95788.631.5%
04489StillwaterPO Box2140.0-39.0%
04933East NewportPO Box0.0
04402BangorPO Box0.0

Adjacent & Nearby Counties