Here’s something nobody tells you when you start a research project: the hardest part usually isn’t coming up with a question; it’s finding real evidence to answer it. You don’t need a university login or a lab budget to get that evidence. A surprising amount of the data professional researchers actually use is sitting in free, public databases; you just need to know where to look.
Below are 15 real databases covering STEM, economics, law, history, and public health, organized by what you’re actually trying to find. Every one of these is free to search, and most let you download the raw data directly. If you already have a topic in mind and want help figuring out which of these actually fits it, this guide to picking a research topic is a good place to start, and a Horizon mentor can help you narrow it down even further once you’re matched.
Key takeaways
- You don’t need paid database access to do real research. Government agencies, universities, and nonprofits publish enormous amounts of data specifically so the public can use it.
- The right database depends on your field, not just your topic. A policy question and a biology question pull from completely different sources, even if they sound similar on the surface.
- “Free” doesn’t always mean “no account needed.” A few databases below ask you to register before downloading, which is still free, just an extra step worth knowing about upfront.
- A mentor can save you hours of searching. Knowing which database actually has the data you need is half the battle, and it’s exactly the kind of thing a Horizon mentor helps with early on, before you’ve spent weeks searching in the wrong place.
Where do you find health and biomedical data?
- PubMed: The largest free search engine for biomedical and life sciences research, with millions of article abstracts and a huge number of free full-text papers through PubMed Central. This is usually the first stop for any health, medicine, or biology-adjacent project.
- CDC WONDER: Public health data straight from the CDC, mortality statistics, disease rates, birth data, broken down by year, location, and demographic group. It’s a genuine goldmine if your project touches public health trends.
- NCBI GenBank: A massive, free archive of genetic sequence data. If your research involves genetics, genomics, or molecular biology, this is where actual DNA and protein sequence data lives.
Where do you find earth science and climate data?
- NASA Earthdata: Free access to NASA’s satellite data on climate, weather, land use, and natural disasters. Students have used this exact data to study everything from deforestation to coastal flooding.
- USGS: The US Geological Survey’s public data on earthquakes, water resources, and geology, updated in near real-time for things like seismic activity.
Where do you find economic and financial data?
- FRED: Federal Reserve Economic Data, thousands of free time series covering interest rates, employment, inflation, and dozens of other macroeconomic indicators, all downloadable and chartable directly on the site.
- World Bank Open Data: Global development and economic indicators for nearly every country, useful if your research compares outcomes across nations rather than just looking at the US.
- SEC EDGAR: Every public company’s official financial filings, free and searchable. If your project involves a specific company’s finances, this is the primary source, not a secondhand summary.
Where do you find social science and survey data?
- ICPSR: One of the largest archives of social science and health survey data in the world. Many individual studies are openly downloadable with a free account, though the full archive is mainly built around institutional membership, so check each specific dataset’s access terms before you rely on it.
- IPUMS: Free, harmonized census and survey data that makes it possible to compare population data across different years and countries without wrestling with inconsistent formatting yourself.
Where do you find legal and policy sources?
- Cornell Legal Information Institute: Free, searchable access to US case law, federal and state statutes, and regulations, no law school login required. This is where you go for primary legal sources instead of a secondhand summary of what a law says.
Where do you find historical and humanities sources?
- Library of Congress digital collections: Free access to historic newspapers, photographs, maps, and manuscripts, including the Chronicling America archive of newspapers going back over a century.
- JSTOR: A huge archive of academic journal articles across humanities and social sciences. JSTOR’s free access program lets you read a limited number of articles per month without an institutional login, which covers a lot of ground for a single research project.
Where do you search across every field at once?
- Google Dataset Search: A search engine built specifically for finding datasets, across government agencies, universities, and research organizations, regardless of your subject area. Useful when you’re not sure which specialized database actually has what you need.
- Data.gov: The US government’s central hub for public datasets across every federal agency, from agriculture to transportation to education. If a topic touches federal policy in any way, this is worth a search before you look anywhere else.
Do you need to know how to code to use these databases?
Not for most of them. Sites like FRED, World Bank Open Data, and CDC WONDER let you browse, filter, and download data directly through a normal web interface, no programming required. Coding becomes more useful once you’re working with very large datasets or want to automate repetitive analysis, but it’s not a requirement to get started with any database on this list.
How do you pick the right database for your specific topic?
Start with your field, not your exact question. If you’re studying a health trend, start with PubMed or CDC WONDER. If you’re comparing economic outcomes across countries, start with World Bank Open Data. Once you’ve found the right general database, narrowing down to your specific question is much easier than trying to search everything at once. If you’re still working out what your research question even is, this guide to picking a research topic is worth reading first, since a clearer question makes database searching far more efficient.
How does Horizon help you find the right data for your research?
Knowing that a database exists is different from knowing it’s the right one for your project, and that’s exactly where a mentor earns their keep. Horizon pairs you one-on-one with a PhD scholar or professor from Oxford, Stanford, Columbia, or another university, someone who already knows which sources are the standard ones in your specific field and can point you there directly instead of you spending weeks figuring it out alone. Across more than 600 specializations, spanning STEM, humanities, and social science, you develop your own research question and work toward a full 20-page paper with that kind of guidance built in from the start.
If your interest leans toward business or economics, 200 business research topics for high school students shows how sources like SEC filings and FRED data pair with specific research questions. If it leans toward humanities, 200 humanities research topics for high school students cover how archives like the Library of Congress and JSTOR fit into that kind of project. You can see full Horizon program details at horizoninspires.com.
Frequently asked questions
Do any of these databases cost money?
The 15 listed here are free to search and mostly free to download from. A few, like ICPSR and JSTOR, ask you to create a free account or work within a monthly free-article limit, which is still no-cost but worth knowing about before you plan a project around them.
Which database should you start with if you don’t know where to look?
Google Dataset Search or Data.gov, since both let you search broadly across fields before you commit to a specialized database. Once you see what’s actually available on your topic, you can move to a more specific source like PubMed or FRED.
Can you use these databases for a project outside the US?
Yes, several of them. World Bank Open Data and Google Dataset Search cover international topics directly, and many others, like PubMed and JSTOR, index research from around the world even though they’re US-based platforms.
Do you need permission to use data from these sources in a research paper?
Generally, no. These are public databases specifically built for research use, and most explicitly encourage it. Just make sure to cite the specific database and dataset properly, the same way you’d cite a published paper.
What if the database you need isn’t on this list?
This list covers common starting points, not everything. A research mentor or a librarian can point you toward field-specific databases beyond these 15, and Google Dataset Search is a solid way to check what else exists for your exact topic before assuming nothing free is available.
Image source: PubMed