2023 Top 100
| Top 100 Revenue: | $609,931,000 |
| Defense Revenue: | $35,622,000 |
| Civilian Revenue: | $574,309,000 |
| 2022 Revenue: | $1.8 billion |
| 2022 Earnings: | $64.2 million |
| 2021 Revenue: | $1.6 billion |
| 2021 Earnings: | $71.1 million |
| Number of employees: | 9000 |
| Headquarters: | Fairfax, Virginia |
| Website: | http://www.icf.com/ |
| Leadership: | John Wasson, chair and CEO |
| Ticker: | ICF |
| Lines of business: | Analytics, cybersecurity, federal IT modernization, policy, program implementation, research, strategy and innovation, human capital, enterprise products |
| Major customers: | HHS, Interior, USAID, Treasury, GSA |
| Major contracts/projects: | Alliant 2, OASIS, HCaTS, GSA schedules, CIO-SP3 |
