This 2025 edition of our annual report provides size data in both nominal and real dollars for the United States heritage compliance sector from 1971 through 2024. The 15-page report includes summary statistics, a breakdown by geographic region and client industry, graphs, and a data table with annual dollar amounts and annual rates of change. Notes are included throughout the report to make understanding these data easier for readers. An annual growth forecast is provided for the next five years (through 2029).