United Counties of Prescott and Russell

The United Counties of Prescott and Russell are two consolidated counties in Ontario, Canada. The county seat is L'Orignal. It was created by a merger between Russell County and Prescott County in 1820. It is in Eastern Ontario.

The county covers an area of . The Alfred Bog is in the county. Many species  of birds, plants, and butterflies live in the bog. According to the Canada 2021 Census, Prescott and Russell has a population of 95,639 people. Many Franco-Ontarian people live in Prescott and Russell. Nearly two thirds of the people speak French as their first language.

There are four townships, one town, two municipalities, and one city in Prescott and Russell:
 Township of Alfred and Plantagenet
 Township of Champlain
 Township of East Hawkesbury
 Township of Russell
 Municipality of Casselman
 Municipality of The Nation
 Town of Hawkesbury
 City of Clarence-Rockland

Category:Counties of Ontario
Category:1820 establishments in North America
Category:1820s establishments in Canada