
Diamond
- County:
- Grundy County
- County Seat:
- No
- Area (mi²):
- 1.9
- State:
- Illinois
Diamond is a village located in Grundy County, Illinois. Diamond has a 2025 population of 2,718. Diamond is currently growing at a rate of 0.67% annually and its population has increased by 3.46% since the most recent census, which recorded a population of 2,627 in 2020.
The average household income in Diamond is $86,824 with a poverty rate of 14.14%. The median age in Diamond is 36.2 years: 30.9 years for males, and 37.4 years for females.