CMU LibGuides: Career and Job Research Guide: Find an employer

Company listings

Hoover's (Now D&B Hoovers)
Use "build a list", or, find a company you are interested in, then check “competitors” on left hand side. Is international. No downloading, but has company profiles.
ReferenceUSA (now Data Axle)
Various modules: US and Canadian companies of all sizes, consumer data, job postings, healthcare offices, personal listings, new business filings, with data visualization and mapping applications. For in depth research: the OneSource module has extensive corporate information on over 5 million global firms.
PrivCo
US private company financials, information on private M&A deals, valuations, venture capital, private equity, etc. Over 800,000 US private companies profiled. Good for locating investors and competitive intelligence. NOTE: You must create an account using your CMU email. Use of this database is for academic purposes only.
CB Insights
A comprehensive global database of private companies and investors activities. Contains advanced searches for private companies, investors, and deals information (especially private equity and venture capital). Also great for news on emerging markets. An excellent resource for startups and entrepreneurship research. (NOTE: You must create an account using your CMU email).

There are hundreds, but these seem to be the most recommended:

CMU Handshake
Handshake is CMU's online recruiting platform that will allow you to explore, find, and apply to job and internship opportunities, connect with great companies, and learn about your career options.
Pittsburgh & PA Jobs and Internships (CPDC)
If you are looking for jobs or internships in the local area, check out these resources from the CPDC!
Indeed
comprehensive international job search site; also gives salary and employment trend data.
USAjobs.gov
thousands of jobs from the US government's official site for federal employment, in every field
Internships.com
Large internship marketplace, including paid and unpaid, full and part-time internships in the US.
ZipRecruiter
comprehensive international job search site; also gives salary data.

Hoover's (Now D&B Hoovers)
Same as the one under "Company listings" - contains nonprofit organizations of all kinds.
Leadership Connect (formerly Leadership Library)
primarily US but also some international - major organizations of all kinds with extensive contact information and quick profiles.

Guidestar.org
Full information, including financials, on all nonprofits in the US. To get full advantage, register first (it's free). Use "Advanced Search" for best results.
Idealist
Nonprofit organizations.

Peterson's Test Prep
Current study guides and practice tests for graduate school exams - MCAT, GMAT, LSAT, GRE - and the TOEFL, as well as a graduate school search feature. Individual users must create an account to access content.