Pekin
- County:
- Tazewell County
- County Seat:
- Yes
- Area (mi²):
- 15.989
- State:
- Illinois
Pekin is a city located in Tazewell County, Illinois. Pekin has a 2026 population of 31,266. It is also the county seat of Tazewell County. Pekin is currently declining at a rate of -0.08% annually and its population has decreased by -1.75% since the most recent census, which recorded a population of 31,823 in 2020.