User-friendly database of US and international time series data maintained by the Federal Reserve Bank of St. Louis.

The Bureau of Labor Statistics publishes data on unemployment and consumer prices, as well as a host of data related to the US labor force.

The Bureau of Economic Analysis (BEA) compiles extensive data on gross domestic product (GDP), personal income, and corporate profits.

The National Bureau of Economic Research (NBER) hosts data covering the US economy, industry, and international trade.

The Congressional Budget Office provides data on federal spending and revenue, projections of future spending and deficits, and forecasts.

See more resources here.