InfobelPROTalk to a data expert
Maine— USA

Companies in Maine

209.6K companies registered in Maine, sourced from official business registers and enriched with industry, size, location and contact data. Below: the largest companies by reported revenue, and how the Maine business base breaks down by industry and headcount.

209.6K
companies
#42
of 50 states
0.3%
of US records
15
industries ranked
September 2026
data updated

Part of the United States company directory.

Rankings

Largest companies in Maine

By reported (actual) revenue, updated September 2026. Public-sector entities are excluded.

#CompanyIndustryCityRevenue (USD)Employees
1Idexx Laboratories, Inc.Manufacture of pharmaceutical preparationsWestbrook$4.3B11,000
2Mainehealth ServicesCombined office administrative service activitiesPortland$3.9B7,000
3MainehealthHospital activitiesPortland$3.4B2,000
4Wex Inc.Other business support service activities n.e.c.Portland$2.7B6,600
5Eastern Maine Healthcare SystemsActivities of professional membership organisationsBrewer$2.4B8,175
6Central Maine Power Company IncElectric power generation, transmission and distributionAugusta$1.5B1,388
7The Cianbro CompaniesDevelopment of building projectsPittsfield$1.3B2,314
8Eastern Maine Medical CenterHospital activitiesBangor$1.1B1,119
9Cianbro CorporationConstruction of bridges and tunnelsPittsfield$1.1B1,639
10Mainegeneral Health AssociatesHospital activitiesAugusta$719M100
11Mainegeneral HealthHospital activitiesAugusta$695M3,800
12Mainegeneral Medical CenterHospital activitiesAugusta$653M2,200
13The Jackson LaboratoryResearch and experimental development on social sciences and humanitiesBar Harbor$653M2,155
14Central Maine Healthcare CorporationHospital activitiesLewiston$605M3,000
15Maine Education Association Benefits TrustNon-life insuranceAugusta$592M3
16Martin's Point Health Care, Inc.Non-life insurancePortland$550M839
17University of Maine Systems IncTertiary educationOrono$511M3,000
18Central Maine Medical Center IncHospital activitiesLewiston$438M1,200
19Camden National CorporationOther monetary intermediationCamden$373M683
20Bangor Savings BankOther monetary intermediationBangor$351M1,092
21Versant PowerElectric power generation, transmission and distributionBangor$335M250
22Mercy HospitalHospital activitiesPortland$328M1,200
23Southern Maine Health CareHospital activitiesBiddeford$325M1,000
24Avangrid Service CompanyElectric power generation, transmission and distributionPortland$312M9
25University of New EnglandTertiary educationBiddeford$247M610

Top 25 by revenue reported to the register. Companies filing no revenue figure are not ranked, whatever their size.

Idexx Laboratories, Inc. leads Maine at $4.3B in reported revenue, from Westbrook.

Coverage

Companies by industry in Maine

The industries holding the most companies, by NACE activity code.

Other business support service activities n.e.c.8299
11,108
Management of real estate on a fee or contract basis6832
8,131
Activities of other membership organisations n.e.c.9499
6,881
Construction of residential and non-residential buildings4120
6,614
Restaurants and mobile food service activities5610
6,184
Business and other management consultancy activities7022
5,897
Real estate agencies6831
5,837
Other human health activities8690
5,381
General medical practice activities8621
4,969
Maintenance and repair of motor vehicles4520
4,071
Other social work activities without accommodation n.e.c.8899
3,868
Mixed farming0150
3,588
Trusts, funds and similar financial entities6430
3,207
Repair of other personal and household goods9529
2,877
Retail sale of flowers, plants, seeds, fertilisers, pet animals and pet food in specialised stores4776
2,785

Ranked by number of companies. Each record carries its NACE code alongside SIC and NAICS, so the same segment can be pulled in any of the three schemes.

Browse these directories

Other business support service activities n.e.c. is the largest activity in Maine, with 11,108 companies.

Distribution

Company size

By number of employees.

1-4
181,967
5-9
14,312
10-19
4,983
20-49
3,535
50-99
1,348
100-199
663
200-499
380
500-999
125
1000+
82

2,216 companies have no disclosed headcount (excluded from the chart).

88% of Maine companies with a disclosed headcount fall in the 1-4 employee band.

Data coverage

What a Maine record carries

Share of the state's companies holding each contact field.

31%

with a website

49%

with a phone number

21%

with an email address

Counted against the 209.6K companies in Maine. Firmographics — industry, size, address, status — are present on every record.

FAQ

Companies in Maine — frequently asked questions

There are 209.6K companies registered in Maine in the InfobelPRO database, across every sector from sole proprietorships to large enterprises.
By revenue reported to the register, the largest company headquartered in Maine is Idexx Laboratories, Inc., based in Westbrook, in manufacture of pharmaceutical preparations.
Other business support service activities n.e.c. (11,108 companies), Management of real estate on a fee or contract basis (8,131 companies), Activities of other membership organisations n.e.c. (6,881 companies) lead the Maine business base by number of companies.
Registered name and address, industry classification in NACE, SIC and NAICS, company status and legal form, employee band, reported revenue where filed, and contact fields — website, phone and email — where available.
Yes. The Maine file is available as a bulk export or through the API, filtered by industry, company size, city or revenue. Licensing is on volume and use, not per seat.

Need the full Maine company file?

Export 209.6K Maine companies with firmographics, size, location and contact fields — API, bulk file or CRM enrichment.

Talk to a data expertGet the full database