Download the list of Private investigators in United States. Smartscrapers provides an accurate directory and the latest data on the number of Private investigators in United States There are 13918 Private investigators in United States as of January 23, 2025; which is an 2.77% increase from 2023. Of these locations, 11599 Private investigators which is 83.34% of all Private investigators in United States are single-owner operations, while the remaining 2319 which is 16.66% are part of larger brands. The top three states with the most Private investigators are California with 1899 Private investigators, Florida with 1355 Private investigators, Texas with 1323 Private investigators. Average age of Private investigators in United States is 4 years and 8 months.