Statistical Data

Title
DiscoverGov (US)
DiscoverGov provides simple, one-stop searching across multiple U.S. Federal Government databases including GPO's Catalog of U.S. Government Publications (CGP) and GovInfo.
Statistics Canada's Rich Data Services (RDS)

Part of the Data Liberation Initiative (DLI) program of statistical tools from Statistics Canada.
Google Dataset Search

Across the web, there are millions of datasets about nearly any subject. Dataset Search has indexed almost 25 million of these datasets, giving you a single place to search for datasets and find links to where the data is. 

More links to free datasets
Odesi

Established in 2007, Odesi (Open Data Documentation, Extraction Service and Infrastructure) is a digital repository for social science data, including polling data. It is a web-based data exploration, extraction and analysis tool that uses the Data Documentation Initiative (DDI) social science data standard. The datasets in Odesi are available to individuals affiliated with member and subscribing institutions.  However, anyone can use the <odesi> search functionality and freely available metadata to identify datasets of interest to them.
Statista

[Note as of 2026: UPEI will not renew this database when the current subscription expires in January 2027, due to budget cuts.]