United States
- FRED (Federal Reserve Bank of St. Louis)
- Bureau of Economic Analysis (BEA)
- Bureau of Labor Statistics (BLS)
- Board of Governors of the Federal Reserve System
- National Bureau of Economic Research (NBER)
- Congressional Budget Office (CBO)
United Kingdom
International
- International Monetary Fund (IMF)
- World Bank
- World Bank Open Data
- European Central Bank (ECB)
- Bank for International Settlements (BIS)
- OECD
See also llms.txt for a machine-readable site summary, and the CPI data guide for how to read a key series.